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Post  1/2A Nut on Sat Nov 23, 2019 6:03 am

Need some more screws so ordered 20 of these type would be
nice if they were half threaded smooth through the backplate.  

#2-56 - Stainless Steel Socket Head Caps Screws SAE Coarse Allen / Hex
https://www.ebay.com/itm/2-56-Stainless-Steel-Socket-Head-Caps-Screws-SAE-Coarse-Allen-Hex-18-8-A2/123516129112?ssPageName=STRK%3AMEBIDX%3AIT&var=424067098058&_trksid=p2060353.m2749.l2649

3D printed beam mount .049 backplate - Page 4 S-l16035
3D printed beam mount .049 backplate - Page 4 20191135

Funfly RC with a .049 can produce enough thrust for a solid 4ch plane if the size is right.
3D printed beam mount .049 backplate - Page 4 Cimg0910
3D printed beam mount .049 backplate - Page 4 Madcow10


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Post  getback on Sun Nov 24, 2019 5:26 pm

lol! lol! lol! lol! lol! lol! lol! lol! lol! lol! lol! lol! lol! lol! lol! lol! lol! lol!
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Post  1/2A Nut on Fri Dec 06, 2019 1:49 am

Welp the socket head bolts showed up so I can assemble the next version.
So much faster to install the screws compared to the flat heads making for
easy non slip removal / maintenance much quicker and it looks good.
With a handle type wrench it is easy to gauge the torque applied.

3D printed beam mount .049 backplate - Page 4 20191210



1996 Real Killer Bee .049 RC
3D printed beam mount .049 backplate - Page 4 20191211

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Post  balogh on Fri Dec 06, 2019 5:54 am

Looks fantastic, Brad...I guess it may take an engine cowl with the carb fully embedded in the plane's nose behind the firewall, and only the NV sticking out , so that the CG should stay aft. I mean having the rear mounted carb completely exposed in front of the firewall would pull the CG too much to the front?
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Post  1/2A Nut on Fri Dec 06, 2019 9:51 am

Thank you Andras  Very Happy

The RX battery will be enough to correct the CG should you use a cowled engine.
The wonderful transition of it all is turning a reed engine into a RC engine.
Throttle rings is one way of course, this version allows a muffler or header etc.
If used with a profile plane the plane itself has it's incorporated beam mounts.
Could have a access hatch for a scale planes to set the NV / hide the engine.

I prefer to expose the engine for all for it's beauty a most unique Cox KB engine and assembly!
Ultimately for me the power plant is a big part of the hobby interest I want to see it running / pulling
the plane fast and slow passes.

3D printed beam mount .049 backplate - Page 4 20191212


A mere 67g as shown / major eye candy encourages me to use it in a project!
The 65 degree mount should allow the use of a typical engine mount I don't have one to check this.
Here shown would need to remove a bit of material for it to clear and set fully on the beams.
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Post  1/2A Nut on Fri Dec 06, 2019 1:33 pm

Update
Ran the engine see results APC 4.1x4.1E / 23,336 rpm.
The E prop unloaded well providing stellar static power.
This prop is better than the APC 4.2x4 due to the thinner
blades and weight. Idle was checked to 9.2k rpm then
pushed it too far and the engine stopped. Will take some
setup efforts to get if functioning down to 7k with small
speed props, with a larger 6x3 idle would be easy to obtain.

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Post  balogh on Fri Dec 06, 2019 1:45 pm

Great performance with that COX RC carb..I have never really been able to tame that carb to a really low idle. Maybe a hot turbo plug will help keep the flame even at lower idle in your Killa Bee?
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Post  1/2A Nut on Fri Dec 06, 2019 3:22 pm

Yes true a turbo plug #3 would provide the best possible idle.
Really for what I do anything under 10k is enough to have it slow
enough for landing then kill the engine when it is close to the ground.
The carb is nice for safety if the radio starts acting up. The SPI
engine in conjunction with a reed induction valve makes it snap
and bark as the fuel and air gets choked down. My Nano X
low idle purrs on a #6 and the Tarno Carb without a pressure tap.

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