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Cox Engine of The Month
April-2024
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"Kress ducted fan with new Cox Conquest 15 RC"



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Post  Jo Nuesseler Sat Feb 03, 2024 4:40 am

Hello together,

I´m new in the forum and hope to have nice conversations. I´m from germany so I will
post all data in metric system, Hope this will be fine for you.
Ten years ago, I took my worn out TeeDee 010 from the early 90´s (used it long time on a scratch built 2-channel glider) and
held it in the fuselage-shell of a 1/32 plastic Modell from Revell. It seemed to be possible...
So I made a negative moulding and got out a nice part. The first wings I made out of Balsa,
Rc equipment was from an horizon-micro heli. Long story short, I failed many times for several reasons,
with different equipment and starting methods and ended up dissapointed and with an even more worn out TeeDee!
I friend of mine proposed to use a bigger "foamie model" bring the Me 163 up and just
try it as a glider. So I took out the Cox engine and putted in a servo to decupple from the towing-model instead.
And it went well! It is steerable, it is fast, the only permanent direction is downwards, but we have the proof!
Equiped now with "Hott" micro reciever and 1,8g-Servos, Lipo 1S 70mah. The wings are fom styrofoam, paper-covered.

Coming back to the cox-powered variant, calculation showed no chance with the standard propeller. The model has
290mm wingspan, weight is 45g, resulting wingload is around 35g/dm²
I need to be fast! So with a new engine, I will cut down a 3x3 prop to around 60mm to get on the requiered rpm´s.
Than I will measure static thrust.
If this shows efforts, I´ll take care about a sled, that will ru on to wires, to let it start "on its own".


Any feedback will be fine and I will post next steps...


Me 163 in 1/32 scale Bild110
Me 163 in 1/32 scale Img_2011
Me 163 in 1/32 scale Img_2010
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Post  1/2A Nut Sat Feb 03, 2024 5:21 am

Cool project post a vid if you can  Small Cox Logo  RC Plane

The props I went with one of my TD .010 projects.



Prop 2.56 x 4N  / 30% Nitro / 18" wing span 43 sq. in.
Static 28,858 rpm / 109.3 mph prop pitch speed / .028hp / 21w / 1.5oz thrust
Best down wind pass 35,184 rpm / 133 mph audio tach / 130.4 mph per Doppler
2.8oz RTF / 2ch  RC micro race plane. Winds gusty to 14 mph.
Hobby People - HP 4x4 E prop cut down.


Prop 2.7x3  / 186.27 km h / 116 mph - per doppler
Unloaded 39,754 rpm 113 mph - per prop calc
Static 30,972rpm / 88mph / .035hp / 26w / 2.3 oz thrust


Stock prop 3x1.25 black prop



TD .010 / 41,985 rpm unload best peak down wind.
Best Pass 50 mph prop pitch speed / Stock Black Prop
2ch / 3oz RC Plane 35% Nitro


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Post  rsv1cox Sat Feb 03, 2024 7:54 am

ME163 Komet, such an interesting and dangerous to service and fly airplane.

https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/196267/messerschmitt-me-163b-komet/

Welcome to the forum. Hoping to hear more from you about this.

Bob
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Post  Jo Nuesseler Sat Feb 03, 2024 7:58 am

Waow, these are very impressive values! Thank you for sharing!
In german puplications they strictly recommend castor oil.
Is it the same under experts here?
And how is your break-in procedure?
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Post  Jo Nuesseler Sat Feb 03, 2024 8:08 am

yes the Komet is very special. I have it in different configuration up to 1/4 scale.

you will find one based on a hobbyking foamy with ecu-controlled hybrid rocket. Probably still the only one worldwide. Search for "worlds first rc me-163 with real rocket engine" I'm not allowed to post a link...
Currently I build one in 1/7 with 23N thrust for 30sec.

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Post  balogh Sat Feb 03, 2024 11:37 am

Jo Nuesseler wrote:Waow, these are very impressive values! Thank you for sharing!
In german puplications they strictly recommend castor oil.
Is it the same under experts here?
And how is your break-in procedure?

Not wanting to pretend that I am an expert but could not agree more to use possibly all-castor lubrication for COX engines, up to 20% in the fuel. A few tanks with rich setting is normally enough to break the COX engines in. Short runs, let it cool, restart, and at the end of say, the 5th tank of the 010,just set it for the max speed and you are good to go...(the stock tank will hold fuel for a ~2 minutes run at full speed)
COX engine manuals advise that due to the excellent manufacturing tolerances applied, breaking in in the conventional sense is not really necessary.
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Post  Jo Nuesseler Sat Feb 03, 2024 12:55 pm

Thank you!
For my understanding, everyone who has the skills for reliable COX-enginge usage is quiet an expert.

I think I killed my first 010, thinking that synthetic oil, wich serves well my other glow engines couldn´t be bad
for my Cox...

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Post  balogh Sat Feb 03, 2024 2:14 pm

It is the balljoint between the piston and conrod where castor varnish helps keep metal surfaces away from each other and prevent premature wear. The soft steel cylinder and hardened steel piston will also last for long with castor. COX tested in an engine test run 400 hours effective lifetime whit of course castor oil in the fuel.
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Post  Jo Nuesseler Sun Feb 04, 2024 8:46 am

Wich prpeller will be a good base to cut down?
I only know these 3x3"

Me 163 in 1/32 scale 20240212
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Post  1/2A Nut Sun Feb 04, 2024 10:16 am

With sharp scissors you can do a back cut on the blades to reduce load.
Keeps the leading edge profile intact and retains good thrust.

Me 163 in 1/32 scale 20240210


Can try the HQ Prop T3020 propeller if you need more thrust.

Me 163 in 1/32 scale 20191142

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Post  Jo Nuesseler Sun Feb 04, 2024 1:58 pm

Thank you for your answer! I would need at least 1,5oz of thrust and maximum availlable speed. Therefor a 3" pitch would be good, or what do you prooose?

I read, that you got 1,5oz of thrust even with a 4" pitch.
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Post  1/2A Nut Sun Feb 04, 2024 4:23 pm

Do you have a flying video of the red plane posted on youtube?


Plane weight size and drag controls the best prop for the plane.
The project should do well with a 3x3N

The 2.56x4 is for very light fast designs.
Static thrust at 1.5oz achieved through high rpm.

Me 163 in 1/32 scale 2_56x410
Me 163 in 1/32 scale 20191143

2.7x3 prop


NANO II - 2nd Trim Flight 2.7x3N Prop / 62.3g - 2.2oz RTF
Best pass this vid:  39,244 rpm  / 112 MPH
Best pass vid 3:  41.5k rpm / 118 MPH  
Static 31,815 rpm / 90 mph PS / 2.46 oz thrust
Engine run time 5 mins. 10sec / 7cc tank / 35% nitro

2ch plane / 15.5in span 28 Sq. In. airfoiled solid balsa wing.
2.2g RX 150 mAh 1S 3.7v / 2g servos. Very min. deflections.
Nervous test flight took 110% full attention.

T3x2 drone prop high thrust made up to 64 mph passes with a larger heavy plane.



Lil Speedy TD .010 / Test Flight 3x2E Green Drone Prop
Best pass cross wind 32,792 rpm / 62 mph / per prop calc.
4.7oz RTF solid pull better loops and faster turns great prop with a throttle.
Down wind passes: 33,941rpm / 64 mph - per 2in pitch .


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Post  Jo Nuesseler Mon Feb 05, 2024 12:07 am

Many thanks again! Unfortunately there is no Video of my Me-163. It weighs 1,55oz and has
a wing area of 20sq.In. So it schould be possible
to get a 1/1 power/weight ratio.
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Post  Tobaiies Wed Feb 07, 2024 11:29 am

Wow, great build! Thumbs Up
I'll be reading along here with interest.

Grüsse aus der Schweiz sunny
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Post  1/2A Nut Wed Feb 07, 2024 10:53 pm

Here is some carbon 3x3 data



Carbon 3x3 Prop / Best Noted Peak 33,107 rpm
More typical 32k rpm / 91 mph static prop pitch speed / 3.6oz thrust
Per prop calc: .058hp / 43.3w / tank duration 2.57 mins. / 35% nitro / 20% oil.

Me 163 in 1/32 scale Td_01013

Blades carbon leading edge was reworked to reduce drag and make more rpm and thrust.

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