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Cox Engine of The Month
June-2019
robot797's

"cox 049 gasoline"

More info on this engine!



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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Tue Feb 26, 2019 7:41 pm

Yes I have been asking for RC carbs for the .010 and .020 there has been discussion on the design
how to make it cost effective and functional. There will be a muffler for the .020 displacement in
general allowing a conventional pressure tap. There is also something in the works for Pee Wee beyond
having a muffler. Aluminum parts aid in cooling, low weight and solid connection to the air frame helps
pick up some rpm to help the engine sing.

A good example of this is this test vid less the RC carb. The goal is to provide good running
engines reliable as possible for successful steady running strong pulling powered flights all the
way to the very last drop of fuel.



Published on Sep 29, 2018
HQ Carbon 3.6 x 4.5N Prop
Static Hold: 24,870 rpm / 106 mph Pitch Speed / .083 hp / 62w

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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  wmazz on Wed Feb 27, 2019 1:51 am

How about a flat slide carb, but they are better described as a
flat slide fuel injection.



Bill M.

Where is your carb discussion at?

I was under the impression that max torque/rpm is gained by
using a wide open throttle (venturi) and a throttled exhaust?
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Wed Feb 27, 2019 3:53 am

Hi Bill,

The goal is goo control / tank pressure and throttle. A exhaust sleeve works well
but no control over the oil spray. Small RC planes can do without getting castor
splashed all over the airframe it just degrades them over time. Barrel type carbs
are easy to make and to introduce a spray bar to atomize the air / fuel mix.

Typically any engine with open exhaust will yield good rpm, however with the
right muffler design and pressure tap we can see gains. Same goes for tuned pipes.
Here is the link to the other thread:


https://www.coxengineforum.com/t11610p125-cnc-aluminum-010-to-15-engine-parts-prototype-testing?highlight=backplates

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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  wmazz on Wed Feb 27, 2019 5:20 pm

I don't see any reason that a throttle exhaust needs to use
the sleeve. Over the years I have seen exhaust restrictors
near the piston and far away from the piston. You should be
able to use a barrel or slide valve in the middle or end of a
muffler.

Is crankcase pressure (CP) with a 1-way valve to supply the
carb an option?
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  balogh on Wed Feb 27, 2019 5:48 pm

I think the "need" with COX engines to use sleeves as exhaust restrictors is dictated by the lack of stock, barrel type mufflers which were only made for the 049/050/051 and 09 size TeeDee and Medallion engines (of which only the 049 Medallion muffler acts like an efficient controllable throttle) but nothing like a barrel type muffler for 010 and 020 size engines, acting as an efficient exhaust throttle were ever made as stock by COX.
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Wed Feb 27, 2019 7:10 pm

Hi Bill,

Crank case pressure is good for full throttle runs. If with a RC carb or
sleeve dropped to idle the pressure push with the NV adjust for full
throttle can cause a very rich idle.

Muffler pressure rises and drops with the rpm much smoother transition
to low idle. I have some exhaust valve types they are ok but some designs
tend to be a bit bulky / heavy. The down fall is in the open state most of the
designs are loud. Restricting the exhaust restricts the piston and builds heat
during the transition. A RC carb does not put strain on the mechanical movements
of engine.
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  wmazz on Thu Feb 28, 2019 11:42 pm

1/2A Nut wrote:
Restricting the exhaust restricts the piston and builds heat during the
transition.

It sure does, and it can lead to detonation. But surprisingly detonation
is rare, unless the engine is wot with a restrictive muffler or pipe.  

1/2A Nut wrote:
Crank case pressure is good for full throttle runs. If with a RC carb or
sleeve dropped to idle the pressure push with the NV adjust for full
throttle can cause a very rich idle.

But you are not swapping parts from another rc engine. You are
actively trying to design your own carb, and therefore you are
not restricted by normal r/c methods.

My first post is a good example. If you combine a cylinder with SPI
that was designed to run an open exhaust, and then put a muffler
on it, The benefits of the SPI are eliminated.

But when you are modifying your own parts, a combination can be
reached that allows the SPI and muffler to work together.


I suggested a flat slide carb because they are easy to build. We
used to use flat slide carbs with crankcase pressure, and a remote
needle valve that was controlled by a separate servo. Engine tuning
was done with the transmitter by linking the throttle servo and the
remote needle valve servo together.

With today's computer radio's it is possible to adjust the remote
needle valve to open at a different rate than the throttle servo.

You would need to build a smaller version of this remote NV, or
modify it for the small engines.


Bill M.
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Fri Mar 01, 2019 3:31 am

Yes I have used remote NV adjustable by servo to fine tune outrigger hydro engines
that run on tuned pipes. Unloaded on the water you get the water born elements producing
variance from startup in the pits. Cooler layer of dense air so close to the water. The pipe runs
cooler and this requires on the spot fuel / air mix adjusting as an example.

Here is the inside of the smallest TD .020 3ch. plane I have, note quarter for size reference and
24mm width at the widest point. Ready to fly 3.4oz
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag6211
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag6210

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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  Ada99 on Fri Mar 01, 2019 1:18 pm

Slightly off topic - Where did you get the TD 020 bullet spinner?

Many Thanks,
=Adrian=
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  wmazz on Fri Mar 01, 2019 6:24 pm

We used the flat slide carbs and remote needle valves on our giant scale (80 to 160cc
w/25% nitro) Reno pylon racers. We adjusted them on the ground, but we could also
tinker with the settings later because we had data acquisition or telemetry to a laptop.
We also used a radar gun to measure mph and I carried a weather station with me where
ever we tested or raced.

Perhaps you could increase your performance with some basic data acquisition. Depending
on how your back plate was machined, you may be able to use a Melexis 90217 as a gear
tooth sensor and measure as the big end pin & connecting rod rotate past the hall sensor.

You could also use a Max31855 (a max31856 is not necessary) and a type k thermocouple
to measure cylinder head temp instead of exhaust temp. There is a few good 3.3v micro
controllers out there (if you are limited to a 1S lipo), like the Arduino Pro Mini (8Mhz), Maple
Mini, Blue Pill, and the Parallax Propeller 1.

With these sensors you could measure rpm, +/- acceleration, determine where peak HP is
located (maybe peak torque), Improve your propellers, tuned pipe, and later a PID system
to regulate the fuel system.

I used to run egt's and cht's, but I found CHT provided reliable tuning data over an EGT
when an engine has small a BDT' We used to run cht at 300', but we found best performance
at 330'

A small Arduino weather station would also help with your test data. The pylon racers
would gain 15 to 20 mph on hot days because of the lower air density. We would get
spectacular rpm and mph data, despite loosing 15 to 20% HP **** to the hot weather.


Bill M.

**** using the SAE correction factor as a guideline.
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Sat Mar 02, 2019 12:14 am

Good info / thoughts Bill Thumbs Up

Weight of any onboard sensors / loggers are possible starting with the .8cc displacements
I use audio software to read real time rpm as the plane passes in front of the camera mic
sub 10ft. generally. I have used a small 11g camera / mic onboard with a 1.2cc engine to
varify my POV data with the onboard data, the onboard was retired as the data was the same
during the passes right in front of me, the benefit of open field flying with no one around me I
can sweep in to capture the top rpm from a shallow dive to near level pass in front of me.

As of last year I started using a tripod mounted radar gun that stays on and holds the current pass
myself and the POV camera picks up on the readings after landing I can display the best reading.
I have but not used a 24" LED display monitor / wifi to the radar locks best read in the right corner
of the screen and displays last pass on main portion of the screen.
The video camera is set up to monitor both plane and readings in the sweet zone when I am making
the best pass by me. I generate momentum as shown in the example vid below.

Knowing prop size used I can calculate unloaded performance and reference it to static
performance on the bench. There I can determine how the weight / drag of the plane is influencing
the rpm numbers in the air then mod props to eek out more speed at the camera. After exhausting
the planes abilities with the given engine used I can do design mods for the next build.

I have 3 gps loggers the smallest has been used with a 1.2cc engine too big for .8cc engines currently
on the hunt for a 12g logger small enough for .8cc although it is just a pacifier as I am only interested
in ground speed as the plane passes in front of me. Radar has already confirm the data reached with
the audio app.



Results:
NANO III / 9oz / 28" span / APC 4.22x5.5N
Best pass 26,647 rpm / 139 mph prop speed
Static Peak: 20,370 rpm / .106hp / 79w / 106 mph PS / 6oz thrust
1oz fuel / 25% nitro / 20 castor

With speed, the sound follows behind the plane neat effect.
Checked all passes found the best per posted vid:
Per Audio RPM Gauge 26,647
Per Prop Calc 139 mph
Per Doppler Wav. Scope software 136 mph / 219 Kp/h

Here is the redesign waiting on good sunny day anything over 70F will test.
Reduces size / weight and added a tuned pipe. Non SPI stock 145 deg. timing
TD .050 the manifold is the best design I have ever seen for a TD. It does have
a bit of refinement needed with the cylinder fit and O ring used to improve sealing.
The aluminum manifold fit has to be tight in cold state so when heated there are no losses.
I plan to show what is possible with a stock engine then step the timing up to 160 deg.
Bench testing has shown improved power to the prop vs a stock muffler and pressure tap.



Published on Jan 12, 2019
1st. test on the NANO-X plane / with backplate pressure.
HQ 4 x 4.5 Peak Static: 26,086 rpm / 111 mph pitch speed
.147hp / 110w / 7.8oz thrust

Published on Dec 21, 2018
1st. bench test:
TD .051 / HQ carbon 4x4.5 / Profi 1/2A Tuned Pipe /  MRP 30.8K rpm
Pipe's MRP is 7.5" set for unloaded state 132 mph pitch speed
Peak static 27,051 rpm / 115 mph / .164hp - 122w / 8.5oz thrust
CNC manifold with crank case backplate pressure tap

Size comparison the NX vs NIII
NIII has now done 37,710 rpm / 161 mph prop pitch speed unloaded with a modified 05 car engine shown.
Will get some good sunny day vid passes with it this season.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag9021

I use 20% castor but this summer will be trying 24% castor, last year I tested 55% nitro 103F on a Aug. day testing to thwart
the heat it did help but too much the engine went rich once in the air and hot on the ground chasing the needle valve.
You had to sag the engine at launch to compensate for the advantage in the air with a leaner NV. Too much fuss for me to
continue, however with 24% castor I may tip the scales and if a 45% nitro blend balance the ease of use with more consistency
in the air. One change must be the NV to fine thread 128 TPI with the slide carb type you mention will improve the airflow
and tuning. The inside walls of the venturi needs to be hour glass shaped to speed up air and cool the influx. The gate needs
to be above the choke point to reduce inhibition, settings and ease of construction. The backplate mount can have the standoff
for the NV built it. The new version of the backplate mounts for the TD .020 as an example provides room for the hall sensor
which could be within 2 mm of the neodymium pellet magnet in bedded into the flywheel as the bore in the backplate takes
it right to the crankpin. RPM can then be monitored if a small enough data logger is sourced. This of course is a luxury for such
a small engine. In conjunction with Accuweather app I can make note of readings by the airport I fly just outside the no fly zone
the large park field has been calculated to be 5.7 miles from the control tower. Could buy a digital infrared thermal meter to
check head temps at launch for external no weight penalty data. Speaking of external here is my gear for radar.

Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Opp10

Staged photo for effect / painting a picture:
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Vlcsna14

I bought this carrier has a shoulder strap to walk it out to the middle of the flying field.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag7110

Limits of my field use thus far has been just the radar gun and tripod. I stand so close to radar I can actually catch a glimps
of the readings as the plane passes by. I prefer viewing off the right shoulder once the plane is locked into it's pass I have
a moment to see the number.  The stand can take it to eye level where you really can't avoid not seeing the number
as the plane passes by me and the radar's gate. There is a audio board for sport use tells you the reading but not able to
read enough mph for my use shame that. The radar I have goes to 200 mph.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Vlcsna15

Here is the setup, I point the radar gun into the wind direction as the plane passes in front of the camera I will have the
mph readings displayed in view on the large display monitor. Will be good to setup this gear once I have found the best
selection of modified props to test. Normal days I get enough data off my camera and rpm readings to determine if the
efforts are going in the right direction.  
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Radar_10


Last edited by 1/2A Nut on Sun Mar 03, 2019 5:25 am; edited 1 time in total
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  wmazz on Sat Mar 02, 2019 11:23 pm

I am in the process of writing more

I have a different opinion on tuning your pipes and modifying
the propellers. May I describe the process along with some
pictures to describe my opinion. It is how I tune larger engines
and is contrary to normal aircraft tuning????

1/2A Nut wrote:
Here is the setup, I point the radar gun into the wind direction as the plane passes in front of the camera I will have the
mph readings displayed in view on the large display monitor. Will be good to setup this gear once I have found the best
selection of modified props to test. Normal days I get enough data off my camera and rpm readings to determine if the
efforts are going in the right direction.  

That is very impressive! for a single person. It took 3
people to test the giant scale pylon racers. A pilot, A
spotter to tell the pilot when to turn, and a 3rd person
to operate the Radar, or monitor the telemetry.

1/2A Nut wrote:
One change must be the NV to fine thread 128 TPI with the slide carb type you mention will improve the airflow
and tuning.


If the slide carb is going to use pressure, there is no need
for a venturi. Just make the carb bore equal to the inside
diameter of the crankshaft.

1/2A Nut wrote:
The inside walls of the venturi needs to be hour glass shaped to speed up air and cool the influx.

There is a point where the id of the venturi will no longer make
a difference, even if a bell-mouth shape exsists.


Have you read any National Free Flight Society Symposiums?

NFFS 2009 Symposium:
Cox TD .020 Nelson Head Development and Other Improvement – Bob Mattes;
Secrets of Speed Engines – How to Make the Most of Your OCD – Scott Newkirk & Ron Bennett;
Free Flight Engine Optimization – Doug Galbreath;

NFFS 2011 Symposium:
Single Cylinder Engine Balance – John Shannon;


Bill M.

National Free Flight Society Symposiums
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Sun Mar 03, 2019 1:28 am

Hi Bill  Thumbs Up yes feel free to add to the thread good info should be documented.

I do have a  Bob Mattes modified TD .020 engine along with a spare nelson plug adapter and
a handful of the small Nelson flat coil plug inserts no longer available.  

I have read through this link but do not have a copy of the NFFS 2009 Symposium:
you can buy a copy as they become available for sale.
http://www.flyfreeflight.com/Site/Cox_020_Rework.html
I have saved the page as one day the link will no longer be good this information is worth saving
far too many dead links out there and photos that no longer open!
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Cox_0210
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Micros10
His vid APC 4.2x2 prop:

This is Bob Mattes doing a custom performance rework on a TD .020
APC 4.2 x 2 shown tuning a  customers engine. Peak 26,001 rpm
9.2 oz thrust / .078hp / 58w /49.2 mph pitch speed / Nelson small insert plug.

Do need a good idle at the expense of top end performance, if the plane gets into trouble I want to throttle down
and recover / to trim surfaces, radio interference, windy weather, tip stalls, low fuel warning down wind etc crawl
backs to the pit area to land etc.

I am going to test the pipe without pressure next, I have removed the crank case backplate from Kirn Kraft and
replaced with a stock backplate. The test is to see how well it will idle and transition along with what loss of top
end rpm. With all the cold weather and wind is allowing me some extra experiments before the plane gets tossed
into some sunny blue sky.

I have bench tested the Profi 1/2A tuned pipe with high performance 05 car engines into 40's best went just past 50k rpm.
Best flown unloaded to 37,710 rpm / 161 mph prop pitch speed.

50k ish / converted car .05 car engine:


Custom crank first bench test:

Picco .85 cc / APC 4.2x4 / 29,473 rpm


This is the highest rpm I have allowed with a TD .049 thus far:

Published on May 7, 2016

TD .049 /SPI / Throttle Sleeve Ports Allow SPI function / Prop 4.1 x 4.1N  / 30% Nitro
Static 24,790 rpm / 7.6oz thrust / .127hp / 94.74w / 96.2 mph / 6.1oz RTF
Unloaded 30,492 rpm best on Vid 1 / 118.4 mph per prop calc.
Doppler reading has it at 118mph per pass at 1:47mins into the vid.
Hard tank no pressure tap. 3.7g servos. Cox low compression plug
3mins 20sec of run time on 15cc tank. 16.5"x4" span wing 66sq. in.

The goal with the Profi pipe and Nano X is around 31k unloaded 4 x 5.5 prop / 162 mph prop pitch speed.
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Fri Apr 05, 2019 3:14 am

Will process this soon just came in the mail Cox .15 radial mount!
I plan on removing the beams and bench testing it prototype testing.
Shown with a APC 7x5 sport prop and Medallion throttle sleeve.
Unless you have a TD .15 it's hard to tell in the pic this thing is a TD .049 on steroids!

Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag9510

Also testing this GMark .030 at RCU turbo plug with 3 cooling fins and radial mount, here is the link:
http://www.rcuniverse.com/forum/1-2-1-8-airplanes-70/11645434-g-mark-061-prop-question-2.html
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag9511

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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  balogh on Fri Apr 05, 2019 3:26 am

lol! ...yes except the glow plug dimensions relative to the glow head it really could be seen as a 049 sTEEreoiDEE
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Fri Apr 05, 2019 5:20 am

Adaptive CNC Performance Parts by KamTechnik!
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Modifi12

This Site Rocks!  RC Plane  Thumbs Up
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Fri Apr 05, 2019 1:49 pm

G Mark .030 - BENCH TESTING RESULTS:
https://www.youtube.com/watch?v=Hgblj--ZWjo&feature=youtu.be



Published on Apr 5, 2019

G Mark .030 / OS Turbo Plug RP6
Aluminum Radial Mount
3 cooling fin plug adapter with extended cooling via backplate.
Peak 21,398 rpm / .045hp - 34w / 5.2oz thrust / 51 mph pitch speed.
Excellent throttle response / big boost in power / 2 clicks rich.
25% nitro / 20% Castor / 73F / 652ft, from sea level.
Cox 4D x 2.5P / .020 prop
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Vlcsna18

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Last edited by 1/2A Nut on Fri Apr 05, 2019 5:43 pm; edited 1 time in total
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Fri Apr 05, 2019 5:25 pm

G Mark .030 / Cox 4.5x2

https://www.youtube.com/watch?v=3tPDuYWEOMc&feature=youtu.be



Published on Apr 5, 2019

G Mark .030 / Cox 4.5D x 2P / OS RP6 Turbo Plug / Aluminum Radial Mount
Peak 21,237 rpm / .056hp - 42w / 8.5oz thrust / 40.2 mph pitch speed
25% Nitro / 20% castor oil

I expect this will unload to 26k ish / good for 50 mph pitch speed / mega thrust for acro.

Summary of 3 props tested:
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 G_mark10
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Happy Re: Cox .01 /.02 /.05 /.09 Engines Speed Planes

Post  1/2A Nut on Sat Apr 06, 2019 4:17 am

Stock prop gets 16.75k Muffler Pressure tap and to 17.3k open exhaust per my test with stock plug.
Stock engine with muffler and the Cox 4.5x2 /17.72k / 34mph / 5.7oz thrust

The hop up parts have improved this engine dramatically / truly within it's displacement now.
it has exceeded a stock TD .020 making it a viable in between class engine to the .049.
Without muffler it is 11g more than a TD .020 with throttle ring. Both being RC engines the .03
can now be swapped in on a .020 plane for a boost in power. I have a new TD .020 Turbo plug
adapter looking for better results will test that next.

Note a perfect fit for a split carb body just slip over the cracked part first the APC
prop adapter will then compress the crack and press fit into place with authority.
A simple fix to a old age problem short of buying a new one this is perfect. Note
I used the larger of the two rings that come with 1/2A APC props. You have to
shave off a bit to match the slope of the carb body with a razor blade. Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag9512
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Post  1/2A Nut on Sat Apr 13, 2019 2:34 am

TEE DEE .15 Special Sleek Radial Mount Conversion! Old Bugger

Excellent fit and finish, robust radial mount for the monster Tee Dee .15 and Medallion engines available soon at
KamTechnik.com this will add improved cooling cleaner set up with better airflow around the crank case and reduce
weight over the conventional beam style bulky nylon engine mounts that require 8 screws. You really have to hold
one of these beasts in your hand to really get an idea of just how sexy clean this set up is! Simple mod all you need
is a bench grinder / buffing wheel and some hand files to feather down the last bits of the old beam mounts smooth.
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag9612
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag9610
Cox .01 /.02 /.05 /.09 Engines Speed Planes  - Page 23 Imag9611

Small Cox Logo Thumbs Up


Last edited by 1/2A Nut on Sat Apr 13, 2019 3:27 pm; edited 1 time in total
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Post  aungmyatoo on Sat Apr 13, 2019 3:38 am

I bought radial mount for 0.010
I wanted to buy 4 but Kam Tchnik Ebay shop allowed only 2. I am really wonder why???
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Post  1/2A Nut on Sat Apr 13, 2019 6:53 am

I do not know why that has happened, send a message to the vendor on ebay. Thumbs Up
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Post  getback on Sat Apr 13, 2019 9:18 am

Cool Deal Brad Thanks , i subscribed to his newsletter so i can get a couple , am looking forward to skinning one down and apply a slide throttle to it !! Should look cool too . This Site Rocks!
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Post  aungmyatoo on Sat Apr 13, 2019 10:07 am

1/2A Nut wrote:I do not know why that has happened, send a message to the vendor on ebay. Thumbs Up

There is Ebay rule set in, the buyer can buy only 2 items in 10 days from Greg. I sent Ebay screen shot to Greg.
May be this Ebay rule set accidentally.
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