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"Cox Pee Wee .020 with 3D printed horseshoe backplate"

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TeeDee 051 Fuel Tank advice

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TeeDee 051 Fuel Tank advice

Post  Phantom805 on Sun Oct 08, 2017 12:49 pm

Hi,

I have built a RC ME163 and have installed a Cox TeeDee 051 to power it. I have made a 2oz fuel tank with 3 lines (fill, overflow, carb). The filler is blocked after fueling. I cannot get the engine to pull up fuel. The line to the carb is approximately 3 inches including the clunk length. Do you think this may be too long to pick up fuel easily? The TD I have is a runner and I suspect that it is a Kustomkraftmanship upgraded one as it came with a fine thread needle and backplate tap. I think the venturi has been drilled out and I have read that this can make fuel pickup worse. The nipple on the side of the engine was already drilled but I plugged it because I didn't want to use pressure unless required. I suspect that pressure is required. Would I be better using the drilled pressure nipple or the kustomkraftmanship backplate nipple? The engine is not easy to get out so I would like to use the most reliable method. Any advice would be greatly appreciated. Many thanks.




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Re: TeeDee 051 Fuel Tank advice

Post  fit90 on Sun Oct 08, 2017 1:04 pm

Very nice looking plane! I prefer the back plate pressure tap. If you go that route you will have to re-plumb the fuel lines. I would also recommend a one way valve between the back plate and tank to avoid filling the crank case. I believe KK back plates may have a valve built in to them. I may easily be mistaken about that, though. Good luck with your project. I hope the plane is a good flier.

Bob
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Re: TeeDee 051 Fuel Tank advice

Post  TDbandit on Sun Oct 08, 2017 1:30 pm

fit90 wrote:Very nice looking plane!  I prefer the back plate pressure tap. If you go that route you will have to re-plumb the fuel lines. I would also recommend a one way valve between the back plate and tank to avoid filling the crank case. I believe KK back plates may have a valve built in to them. I may easily be mistaken about that, though. Good luck with your project. I hope the plane is a good flier.

Bob
I agree, it's about the best thing for a tight installation for the TD
And as Bob mentioned, you have to have a check valve to prevent flooding. If you elect to drill the back plate on your own be very careful since it's quite thin, you may also have to machine it flat to prevent any thread protrusion from interfering with the rod.
(Bandit)
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Re: TeeDee 051 Fuel Tank advice

Post  Phantom805 on Sun Oct 08, 2017 1:57 pm

Thanks for the advice. I very much enjoyed building it last winter (in the UK). After enjoying looking at it through the summer I thought it was time to get it into the air. I think you are right with the kk backplate. According to the instructions it is on a ball valve that opens and closes. I guess blowing and sucking through some fuel tube will confirm it is working correctly. I am guessing that I will fit a t-joint on the filler and connect the other end to the backplate nipple? I assume that you then block the filler and overflow lines? Thanks again.

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Re: TeeDee 051 Fuel Tank advice

Post  1/2A Nut on Sun Oct 08, 2017 2:58 pm

No need to block the fill line after fueling up. Simply fuel up till it over flows then temporarily block the over flow port and push more fuel in until you see the venturi line filled up and some gets into the venturi. Unblock over flow line and flip over the prop till you sense a wet piston. Start engine with a rich needle valve setting. 5 turns out should do it. Never drill a TD back plate, the nipple would not have a hole small enough, would need to be the dia. of 30 gauge wire. All the same stock back plates are too thin really requires an epoxy puddle to stabilize the nipple. You can buy very small brass nipples I have some about 1.5mm dia. threads yet still lets too much pressure into the tank. Ultimately it causes idle issues, only good for full throttle setting. No chance of a RC carb or a throttle sleeve.

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