Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» SIG Wonder build thread - ASP12 vs COX TD09
by Surfer_kris Today at 4:43 am

» My Engine Running.
by MauricioB Today at 1:11 am

» A Return to Genius
by batjac Today at 1:03 am

» 1960's Top Flite 'Hurricane' Build
by Kim Today at 12:12 am

» wen mac-testors spare parts
by Oldenginerod Yesterday at 9:19 pm

» Brodak 1/2oz Tank Question
by Tee Bee Yesterday at 7:17 pm

» Cox Engine Forum Speed Contest 2018!!!
by JPvelo Yesterday at 5:17 pm

» Hurricane Irma CEF friends check in
by rsv1cox Yesterday at 5:01 pm

» OK Brodak P-40b thread cuz it is time to STOP hi-jacking Rusty
by fredvon4 Yesterday at 4:32 pm

» NIB Testors P-38 #stickershock
by Mark Boesen Yesterday at 3:25 pm

Cox Engine of The Month
October-2017
MauricioB's

"Cox Medallion .049 R/C"



PAST WINNERS
Speed Contest 2018
CEF Traveling Engine

Gallery


Win This Engine!
The Traveling Prop
World of Aviation

Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Page 4 of 6 Previous  1, 2, 3, 4, 5, 6  Next

View previous topic View next topic Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Sun Oct 01, 2017 2:36 am

1/2A Nut wrote:Thank you and happy to do Small Cox Logo

I plan to do one more test perhaps the most important one HQ 5x4.5 carbon prop which will
fit well with this engine providing fantastic thrust and speed for a reed valve engine.

If the data is good I would like to build a Speedy Reedy RC plane with a special
firewall to suit the reed engine's back plate for improved air intake. My goal is to have a good video of a 100 mph +
reed powered RC plane something that I have never seen yet. A custom cut 4.5x5 will be good for top end speed.






I follow with much respect everything that you Brad does, it is very interesting and serious!
The model that you mention is of own design or is a model already manufactured? ... if you have the shapes, could you place the lines to see your type of figure?
What you comment on making a flame arresters with the possibility that the engine air without problems is something special? I have built some models that have an air intake slot for that effect.
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Sun Oct 01, 2017 10:05 pm

Yes a very good way to induce more air into the intake.
I will modify the back plate as shown to induce more air maintaining minimum drag.
20" span 70 sq. in / 16" long fuselage, looking for 100 mph +

Speedy Reedy






Listen to this rpm the needle gets set then the glow plug becomes loose, so short vid.
Goal will be 26k rpm unloaded with a 4.8x4.5N around 115 mph down wind.



AmpAbuser
Published on Oct 1, 2017

Real Cox Killer Bee  Carbon 4x4.5 / 1.8g prop - Cox Made Date: May 31st 1995
High rpm reed function check mylar reed.
Best peak 25,516 best steady static: 25,193 / 107mph / 7.1oz thrust / .132hp / 98.47W  
Glow plug adapter gets loose hence short clip, but was able to reach peak NV setting.
98.47w that is TD power due to the prop type, goal is 6oz RTF. Engine weight with prop
1.65oz leaving 4.35 oz toward the 2ch plane.


Small Cox Logo


Last edited by 1/2A Nut on Sun Oct 01, 2017 10:27 pm; edited 2 times in total
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Sun Oct 01, 2017 10:23 pm

1/2A Nut wrote:Yes a very good way to induce more air into the intake.
I will modify the back plate as shown to induce more air maintaining minimum drag.
20" span 70 sq. in / 16" long fuselage, looking for 100 mph +

Speedy Reedy






Listen to this rpm the needle gets set then the glow plug becomes loose, so short vid.
Goal will be 26k rpm unloaded with a 4.8x4.5N around 115 mph down wind.




Small Cox Logo

Good evening Friend, it is a beautiful model !, a razor!
that engine sounds hellish! ... it's amazing to think the movement of your parts inside !, what quality materials! Damn!
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  Surfer_kris on Mon Oct 02, 2017 10:48 am

Best peak was 29715 rpm?


avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1351
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  Surfer_kris on Mon Oct 02, 2017 10:50 am

Were there any "product" engines supplied with the fine thread needle?

I have a red backplate with what looks like a fine thread needle in it, but the needle is longer and hollowed out...
avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1351
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Mon Oct 02, 2017 2:54 pm

Erroneous spike I checked with another device the ramp up number is 25,193.
Will be doing another vid test with my other meter using a 5x4.5 next.
Reed valve engines are hard to monitor the rpm unless they are singing solid.

I have never seen a Red backplate with a hollow NV at the steam, imagine
the idea was to stave off vibrations / less weight.

Good example of this test once the engine starts to hold steady the meter locks in.

avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Tue Oct 03, 2017 9:56 am

1/2A Nut wrote:Erroneous spike I checked with another device the ramp up number is 25,193.
Will be doing another vid test with my other meter using a 5x4.5 next.
Reed valve engines are hard to monitor the rpm unless they are singing solid.

I have never seen a Red backplate with a hollow NV at the steam, imagine
the idea was to stave off vibrations / less weight.

Good example of this test once the engine starts to hold steady the meter locks in.


Hi Brad, I have a curiosity, to see your tachometer I wonder how it works, that is, exactly how the rpm reads ?. Mine I have to face the propeller and cut off the light passing each time one of the blades passes. I do not see that the one you use has to be placed in that position, therefore, as it does to read the rpm? Huh...
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Tue Oct 03, 2017 2:21 pm

I use a smart phone audio app you can preset on 2 or 4 stroke engines rpm up to 50,000 rpm.
Use to use photocell type tachometers still own two of them. The smart phone has two mics
one on each end. My other smart phone has 1 mic which seems to lock in the readings better.
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  Surfer_kris on Tue Oct 03, 2017 3:14 pm

On the subject of "what do you get..."

Here is a scruffy looking engine that came with a box of other stuff. I always assume that it was a product engine, but the needle is fine threaded and lightened (drilled out). So what did I actually get...?





avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1351
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Tue Oct 03, 2017 7:44 pm

This is progressive for a product engine, is it bored out 3/4 deep through the non threaded portion
of that stem / what is the cylinder number?
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Tue Oct 03, 2017 9:40 pm

1/2A Nut wrote:I use a smart phone audio app you can preset on 2 or 4 stroke engines rpm up to 50,000 rpm.
Use to use photocell type tachometers still own two of them. The smart phone has two mics
one on each end. My other smart phone has 1 mic which seems to lock in the readings better.

that's interesting my friend, it's the first time I see a team like that !.
Out of curiosity ..... have you tested with both teams at once ?, simply to check the laps that one instrument throws compared to the other. Surely as you are, surely already did!
Thanks for the explanation!
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Tue Oct 03, 2017 9:57 pm

Yes, I have the software loaded on two smart phones and 2 tablets. If I vid the effort
I can narrow down the reading with the audio recording. Key is you need a steady
tone to lock onto.

Example here where there is only one exhaust note out the muffler makes for a easy
reading at all rpm's. The Killer Bee has 2 vented slots on each side of the cylinder this
makes the audio tach work harder to lock on, my experience with this condition is to
use a secondary tach and replay the video section in a loop to lock in on the tone.

avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Tue Oct 03, 2017 10:19 pm

1/2A Nut wrote:Yes, I have the software loaded on two smart phones and 2 tablets. If I vid the effort
I can narrow down the reading with the audio recording. Key is you need a steady
tone to lock onto.

Example here where there is only one exhaust note out the muffler makes for a easy
reading at all rpm's. The Killer Bee has 2 vented slots on each side of the cylinder this
makes the audio tach work harder to lock on, my experience with this condition is to
use a secondary tach and replay the video section in a loop to lock in on the tone.


Okay, it's notorious in that way as the computer stays more steady and even when you "hear" the sound of a single output!
Thank you! = GRACIAS!
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Wed Oct 04, 2017 9:36 am

Yes that and the single mic smart phone seems to lock in better than the dual mic used
during the reed valve engine tests. I plan on one more test perhaps today will use the
black cased single mic smart phone for that test.

RC Plane
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Wed Oct 04, 2017 2:53 pm



AmpAbuser
Uploaded on Oct 4, 2017

Killer Bee .049 / HQ 5x4.5 / 19,379 rpm
Static 10.6oz thrust / 83mph  / .147hp / 110w
Est. unload in the air at 22.7k rpm 97 mph
Sound came out bad due to the dual mic cell phone.
Tank moved mid way in the test sagged the engine
there is enough data to get a solid reading. Best
peak 19,379 and 19,299 more common. Prop is
ideal, allowing the engine to make the most power
out of all tests 110w per prop calc. Prop will unload
to a safe rpm maintaining good reed function.

Carbon Nylon:
110w / HQ 5x4.5 / 19.38k
98.47w / HQ 4x4.5 / 25.2k

Vintage Props:
75.4w  / Cox 4.5x4 / 20.5k
76.8w / Tornado 5x3 / 21.9k


Last edited by 1/2A Nut on Fri Oct 06, 2017 2:28 am; edited 1 time in total
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Fri Oct 06, 2017 12:45 am

What size tank have you been using with your reed powered .049 planes and run time?
I am thinking 1/2oz will provide perhaps 4 mins. with the 5x4.5 more if with a throttle
sleeve and some low throttle time.
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Fri Oct 06, 2017 1:49 am

1/2A Nut wrote:What size tank have you been using with your reed powered .049 planes and run time?
I am thinking 1/2oz will provide perhaps 4 mins. with the 5x4.5 more if with a throttle
sleeve and some low throttle time.

Hi Brad,
1/2 oz = 14.78 ml then,
I used a tank of 10 ml = 10 cc = 0.33814 oz This lasts in my model 4 to 5 minutes of flight depending on the speed of acceleration, since I have it with speed hoop. Propeller 6x3
with 1/2 oz. I think you can get there within 5 minutes!
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Fri Oct 06, 2017 2:43 am

Thank you I have not done much with Reed Valve engines other than CL flying
with RTF cox planes. All scratch built efforts have been with TD engines.

Only 3mins and 15 seconds with the TD on a half oz tank mostly at full throttle.

Found these 18 ml or .61oz for a bit more run time would get 4mins TD and
should do a solid 6mins with the reed engine with the 5x4.5 prop.

avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Fri Oct 06, 2017 9:48 am

1/2A Nut wrote:Thank you I have not done much with Reed Valve engines other than CL flying
with RTF cox planes. All scratch built efforts have been with TD engines.

Only 3mins and 15 seconds with the TD on a half oz tank mostly at full throttle.

Found these 18 ml or .61oz for a bit more run time would get 4mins TD and
should do a solid 6mins with the reed engine with the 5x4.5 prop.


Great !, Are you going to place throttle regulation ring or will you use it directly, ie full gas all the time?
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Fri Oct 06, 2017 2:54 pm

I would like to use a throttle sleeve around the exhaust ports  
if I can maintain SPI function would save some run time for more
high speed passes. The project is for Reed Speed rather than sport
flying.

- 3.7g servos with a 200mah LiFe pack for the RX.
- Orange Rx R410X DSMX  4Ch
- 25% nitro
- 4.5x4.5 carbon prop
- Ply fuselage fuel proofed
- Sig airfoiled wing plank formed symmetrical
- Monocote flying surfaces
- It may get a TD after I am content with whats possible with the reed valve.

avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Fri Oct 06, 2017 4:34 pm

1/2A Nut wrote:I would like to use a throttle sleeve around the exhaust ports  
if I can maintain SPI function would save some run time for more
high speed passes. The project is for Reed Speed rather than sport
flying.

- 3.7g servos with a 200mah LiFe pack for the RX.
- Orange Rx R410X DSMX  4Ch
- 25% nitro
- 4.5x4.5 carbon prop
- Ply fuselage fuel proofed
- Sig airfoiled wing plank formed symmetrical
- Monocote flying surfaces
- It may get a TD after I am content with whats possible with the reed valve.


friend are you going to use this rx ?:

Be careful! I have used it in Foamys without problems, but when placed in a cox .010 after the third flight of about 10 minutes each, it stopped working !, I made a signal affraid . (The RX does not work anymore), I do not know if it was affected by vibration or what happened, but for glow, I discarded it completely.
He used it with a 200-mah 1-cell line. Just so you remember.
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  roddie on Fri Oct 06, 2017 5:33 pm

Brad, You may want to regulate the voltage of your LiFe Rx batt. from 6.6V to 6V or less. Not sure if Mauricio's R410X Rx failure was a result of over-voltage.. or just a fluke. Better to play it safe.
avatar
roddie
Top Poster
Top Poster

Posts : 5312
Join date : 2013-07-17
Age : 57
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  1/2A Nut on Fri Oct 06, 2017 8:19 pm

So 3 ten minute flights for 30 mins plus start up time on 200 mah with unknown servo draw
odds are you went nominal 3.7v or less and range was reduced perhaps as low as 100- 150ft.
Not sure how the RX protected inside the fuselage. Could have been a dud.. it is possible.


----------------------------
Yes I have 4 of them they all work with my 1/2A planes from .020 to .09 so far.
Note I always rap them in foam. 2S power LiPo and LiFe.


"R410X exceeds the range of other receivers in the same class"
- wonder what class they are in, perhaps because they can handle 9.6v
  which would give them better range.

They don't have a long range use within 400ft never on 1S too risky as range is at risk.

Input voltage: 3.7~9.6V
Size: 16x27x10mm
Weight: 2.7g
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1226
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Fri Oct 06, 2017 10:15 pm

I have only two servants placed, ailerons and elevator, 200 mah extra.
The issue is that the RX does not work anymore, I ran out of signal and I could never recover the RX, even recharging the battery.
The good thing about this design of Frank Ehling, is that he flew alone until he touched the ground without destroying himself .... I have my plane !!!!
avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  MauricioB on Fri Oct 06, 2017 10:23 pm

1/2A Nut wrote:

They don't have a long range use within 400ft never on 1S too risky as range is at risk.

Input voltage: 3.7~9.6V
Size: 16x27x10mm
Weight: 2.7g

400 pies = 121,92 metros
¡Mi modelo señaló a 5 metros de distancia = 16ft! Shocked

here I have 4 channels, but it is a Foamy .... maybe it was chance !, because I will never know!

avatar
MauricioB
Platinum Member
Platinum Member

Posts : 1015
Join date : 2016-02-16
Age : 46

View user profile

Back to top Go down

Re: Buy a Cox! ... but, what exactly do you buy?: KILLER BEE .051 1996

Post  Sponsored content


Sponsored content


Back to top Go down

Page 4 of 6 Previous  1, 2, 3, 4, 5, 6  Next

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum