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Cox Engine of The Month
April-2021
fredvon4's

Finely polished Cox .049 with exhaust collector.




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Post  Alfredo Rubio Fri Feb 05, 2021 9:28 pm

Many years ago I flew CL models, even my first motor was a TD. But now after 29 years I came back to CL and discovered that I love speed, so I started to investigate on the web how to obtain more RPM and more speed in my racer design.

Today I got the 22, 200 RPM with the Cox TD .051 and a 4X4 prop.

Cheers

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Post  Cribbs74 Fri Feb 05, 2021 11:22 pm

Nice, have you done anything special to the engine? There are several ways to get some high revs out of the TD.

Ron
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Post  Alfredo Rubio Mon Feb 08, 2021 12:08 pm

I designed my first speed CL model, named AV-1 In Memoriam of my son Avraham.

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Post  getback Tue Feb 09, 2021 7:52 am

Very Nice , Like the forward wing design >> You got any Videos you can share , love to see it doing its thing . Very Happy
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Post  rsv1cox Tue Feb 09, 2021 8:42 am

Awesome, goes against convention. Me too on Eric's request!!!!
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Post  Alfredo Rubio Tue Feb 09, 2021 11:18 am

I glad you like it, this is the video of first flights, the burst came in last seconds of flight.

https://youtu.be/pYcuDY9af2I

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Post  Alfredo Rubio Tue Feb 09, 2021 11:22 am

This is the motor and plane that I start to learn about high perfonrmance in speed flights. The video is the first stage of flights, with a Tornado 5 1/4 x 4 prop. The spray bar is from ACE that works great.
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Post  1/2A Nut Tue Feb 09, 2021 12:23 pm

Thank you for sharing the vid well done! Thumbs Up

Some comparison results:

Tee Dee .049 / Kamtechnik Turbo Plug Adapter / APC 4.2x4



23,498 rpm / 7.8oz thrust / .120 hp - 89w / 90 mph pitch speed
OS RP7 / 2 head gaskets / 15% nitro / ACE NV / Throttle sleeve
SPI / stock venturi.

Update 1 head gasket 24,386 rpm full NV peak.

Small Cox Logo Thumbs Up


Last edited by 1/2A Nut on Tue Feb 09, 2021 1:42 pm; edited 1 time in total
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Post  rsv1cox Tue Feb 09, 2021 12:27 pm

@Alfredo Rubio wrote:I glad you like it, this is the video of first flights, the burst came in last seconds of flight.

https://youtu.be/pYcuDY9af2I


Nice job, leaned out at the end really spun you around a bit. Which model was it?
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Post  getback Wed Feb 10, 2021 8:54 am

Cool ! she did lean out good when the fuel got low , what line length are you using ? Small Cox Logo
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Post  Alfredo Rubio Wed Feb 10, 2021 7:38 pm

@1/2A Nut wrote:Thank you for sharing the vid well done!  Thumbs Up

Some comparison results:

Tee Dee .049 / Kamtechnik Turbo Plug Adapter / APC 4.2x4



23,498 rpm / 7.8oz thrust / .120 hp - 89w / 90 mph pitch speed
OS RP7 / 2 head gaskets / 15% nitro / ACE NV / Throttle sleeve
SPI / stock venturi.

Update 1 head gasket 24,386 rpm full NV peak.

Small Cox Logo Thumbs Up

Thanks!! I saw your videos in Youtube and learned some tips
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Post  Alfredo Rubio Wed Feb 10, 2021 7:40 pm

@rsv1cox wrote:
@Alfredo Rubio wrote:I glad you like it, this is the video of first flights, the burst came in last seconds of flight.

https://youtu.be/pYcuDY9af2I


Nice job, leaned out at the end really spun you around a bit.  Which model was it?

Thanks I glad you like it. This is my own design, I named AV-1 in Memory of my smaller son that pased away almost 2 years ago.
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Post  Alfredo Rubio Wed Feb 10, 2021 7:41 pm

@getback wrote:Cool ! she did lean out good when the fuel got low , what line length are you using ? Small Cox Logo

I use .008 lines 10 metters lenght.
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Post  rsv1cox Thu Feb 11, 2021 6:49 am

@Alfredo Rubio wrote:
@rsv1cox wrote:
@Alfredo Rubio wrote:I glad you like it, this is the video of first flights, the burst came in last seconds of flight.

https://youtu.be/pYcuDY9af2I


Nice job, leaned out at the end really spun you around a bit.  Which model was it?

Thanks I glad you like it. This is my own design, I named AV-1 in Memory of my smaller son that pased away almost 2 years ago.

I share your pain, my wife and I lost a baby boy in infancy. Painful, and you have my condolences.

Bob
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Post  getback Thu Feb 11, 2021 7:13 am

If you want speed you need to wind it up and back off just a tad 1/4 turn? or less if you use the search under reed speed or just speed you will get alot to look at LOL https://www.coxengineforum.com/t8828-reed-speed-2016-qualifying-photos?highlight=reed+speed I got a flight in at page 5 >> https://www.coxengineforum.com/t12305p100-2018-to-2019-cef-run-what-ya-brung-unlimited-speed-contes-closed?highlight=reed++td+speed the last contest we had there are others Fun and Fall Down time lol! I Love This Forum! we got prizes tooo !!
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