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» **VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (May 2024)by Greenman38633 Today at 10:15 am
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Cox Engine of The Month
Pee Wee Horseshoe back plate
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Re: Pee Wee Horseshoe back plate
That sound nice. I cannot honestly remember if I had ever heard an .020 run before. If I may ask. What is a 'venturi backplate mount'? Is it the second one you had posted a picture of? If so, where does the needle assy go. That part has me confused. I would be happy with just the standard one, unless there is something I do not know or understand with the function of the second one. Will be watching for sure. Keep up teh good work!
NEW222- Top Poster
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Location : oakbank, mb
Re: Pee Wee Horseshoe back plate
You can just screw in the venturi and NV body on like you would a TD.
A RC carb could be screwed on the backplate too. Could do up a printed
throttle barrel air choke and use the TD NV assembly.
A RC carb could be screwed on the backplate too. Could do up a printed
throttle barrel air choke and use the TD NV assembly.
1/2A Nut- Top Poster
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Join date : 2013-10-20
Age : 60
Location : Brad in Texas
Re: Pee Wee Horseshoe back plate
Where are these available at ?I could redesign the back to use a TD .020 venturi and NVA since these are available new again. wrote:
getback- Top Poster
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fredvon4- Top Poster
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aspeed- Platinum Member
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Location : Leamington Ont. Can.
Jason_WI- Top Poster
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Re: Pee Wee Horseshoe back plate
Check out this project:
https://www.thingiverse.com/thing:3457716
I have asked if this will hold up to nitro 25 to 35%
The E version flies very well with 3 times the power of a TD, many folks have started to print
and fly the electric version with no issues thus far. The weight of the E version is much more
due to batteries and still floats in fine on landings. Direct engine exhaust is going to melt that
firewall the designer is going to need to compensate with a heat shield or muffler.
https://www.thingiverse.com/thing:3457716
I have asked if this will hold up to nitro 25 to 35%
The E version flies very well with 3 times the power of a TD, many folks have started to print
and fly the electric version with no issues thus far. The weight of the E version is much more
due to batteries and still floats in fine on landings. Direct engine exhaust is going to melt that
firewall the designer is going to need to compensate with a heat shield or muffler.
1/2A Nut- Top Poster
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Location : Brad in Texas
Re: Pee Wee Horseshoe back plate
Maybe some aluminum foil tape over the front would help scare away the heat. That mount looks nice. A CNC mill would be handy to have to make an aluminum mount. Maybe work a bit of overtime to save up :-)
aspeed- Platinum Member
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Join date : 2013-01-18
Location : Leamington Ont. Can.
Re: Pee Wee Horseshoe back plate
HVAC aluminum foil tape should work. Could also print out of PETG that has a higher tg than PLA.
Jason_WI- Top Poster
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Re: Pee Wee Horseshoe back plate
I expect a flight vid at some point he has posted his E version 3wks ago, will post the link
when it happens. I have some of that aluminum tape too, the sticky will unstick but if glued
on it wont go anywhere. Yes the entire project is done with PLA.
when it happens. I have some of that aluminum tape too, the sticky will unstick but if glued
on it wont go anywhere. Yes the entire project is done with PLA.
1/2A Nut- Top Poster
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Re: Pee Wee Horseshoe back plate
NEW222 wrote:That sound nice. I cannot honestly remember if I had ever heard an .020 run before. If I may ask. What is a 'venturi backplate mount'? Is it the second one you had posted a picture of? If so, where does the needle assy go. That part has me confused. I would be happy with just the standard one, unless there is something I do not know or understand with the function of the second one. Will be watching for sure. Keep up teh good work!
I’m trying to replicate this setup with the venturi backplate mount.
Good news I found my 11/64-40 tap. I had used it to tap the backplate on the engine above.
Jason_WI- Top Poster
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Re: Pee Wee Horseshoe back plate
That is good news onward ye goes!
1/2A Nut- Top Poster
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balogh- Top Poster
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Re: Pee Wee Horseshoe back plate
That aluminum mount is pretty cool, but requires quite a bit of strength from the material used.
For a plastic version it might be necessary to make a "flange" style mounting surface similar to the birdgage mounts used on Thermal Hopper. Maybe also increase the radius of the bases of the "legs" to spread the load to a bit wider area.
In any case, it is quite mind-blowing to realize that you can print the sealing surface and the retainer groove of the reed system with adequate accuracy and surface quality.
For a plastic version it might be necessary to make a "flange" style mounting surface similar to the birdgage mounts used on Thermal Hopper. Maybe also increase the radius of the bases of the "legs" to spread the load to a bit wider area.
In any case, it is quite mind-blowing to realize that you can print the sealing surface and the retainer groove of the reed system with adequate accuracy and surface quality.
KariFS- Diamond Member
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Age : 52
Re: Pee Wee Horseshoe back plate
My Bad , i was thinking Pee wee since we were talking that then went to TD i new thoses ventura were available , But thanks Fred and aspeed < > Those TD mounts will bee cool if you can get it to stay together .
getback- Top Poster
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Re: Pee Wee Horseshoe back plate
I’m trying to replicate this setup with the venturi backplate mount.
Good news I found my 11/64-40 tap. I had used it to tap the backplate on the engine above.[/quote]
Could the Carl Goldberg .049 postage stamp backplate mount you made be resized and adapted to go over the venturi style pee wee back plate? Or, could they be combined? I know it is really easy for me to type this stuff. I can only imagine what it is like to be doing what you are doing.
Good news I found my 11/64-40 tap. I had used it to tap the backplate on the engine above.[/quote]
Could the Carl Goldberg .049 postage stamp backplate mount you made be resized and adapted to go over the venturi style pee wee back plate? Or, could they be combined? I know it is really easy for me to type this stuff. I can only imagine what it is like to be doing what you are doing.
fit90- Diamond Member
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Jason_WI- Top Poster
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Re: Pee Wee Horseshoe back plate
How much does that assembly weigh with engine?
1/2A Nut- Top Poster
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Jason_WI- Top Poster
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getback- Top Poster
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Jason_WI- Top Poster
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Re: Pee Wee Horseshoe back plate
That sounds and looks great!!
fit90- Diamond Member
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Re: Pee Wee Horseshoe back plate
Wow. That doesn't even look like it was 'printed', but rather pressed in a mold. I really enjoy seeing your pictures of stuff you print.
NEW222- Top Poster
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Re: Pee Wee Horseshoe back plate
Its definitely printed. .1mm layer height or 100 microns. I believe I can get better resolution using .9 degree stepper motors vs 1.8 degree stepper motors on the X and Y axis. Less artifacts when micro-stepping in the firmware of the printer controller.
The second picture shows the support material removed. Without support the overhanging parts couldn't be printed. The brim around the legs help keep them adhered to the bed. Nylon likes to warp. I chuck the venturi mount in the lathe to give the surface area where the NVA seats a flat surface. I can shorten this tube now by .2" to save material. I made it longer to adjust the offset of the NVA.
The second picture shows the support material removed. Without support the overhanging parts couldn't be printed. The brim around the legs help keep them adhered to the bed. Nylon likes to warp. I chuck the venturi mount in the lathe to give the surface area where the NVA seats a flat surface. I can shorten this tube now by .2" to save material. I made it longer to adjust the offset of the NVA.
Jason_WI- Top Poster
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Jason_WI- Top Poster
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