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Cox Engine of The Month
May-2018
Kim's

"War Dog hauls the 2M B.O.T. out of Uncle Wayne's backyard"



PAST WINNERS
Speed Contest 2018
CEF Traveling Engine

Win This Engine!
The Traveling Prop
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World of Aviation

Speed Plane Tank Size

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Speed Plane Tank Size

Post  RK Flyer on Fri Jan 12, 2018 9:36 pm

I am scratch building a speed plane for the contest and plan on using a stock 049 Tee Dee for power. I am wondering if anyone can give me an idea of the smallest tank size for the required laps? Brodak has several tanks from 1/3 oz & up.
My plane has a built up Fuse but its only 1/2" wide and I plan on in letting the tank 3/8 ths" into the side, the rest will stick out.

Also if someone has a 049 Tee Dee for sale , please let me know!!   Hand Shake

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Re: Speed Plane Tank Size

Post  roddie on Sat Jan 13, 2018 12:16 pm

Hi Richard. My T-33 will be powered by a Tee Dee as well. I'm not sure how much fuel will be needed.. but I would think that 1/3oz. would be plenty. 1/3oz. = 9.76cc's. If you have a tank that's at least that size.. you can bench-run the Tee Dee and use a syringe to inject 9cc's of fuel into that tank and time the bench-run.

Below is a vid of Eric's (getback) 2016 entry which used a Tee Dee .049. He had plenty of fuel to complete the required laps. This year, the line-length has been reduced from 42 feet to 35 feet.. which will require more laps to cover the same distance. It seems to me that a 60-second engine-run is more than enough time to complete the circuit. I hope this has been helpful.



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Re: Speed Plane Tank Size

Post  getback on Sat Jan 13, 2018 12:33 pm

Yes it was a #2 3/8 oz. wedge tank And i had plenty enough// with this year it state ONE ROUND TO GET LEVEL AND THEN TEN LAPS TO COMPLETE << >> I think 1/3 oz may would bee enough !? This Site Rocks! well that's one more and Fred said he was building but not fling !?!? I think as soon as i get situated i am going to start a build for this speed contest $$ Richard i may have a engine to sell TD.049 if you have not found one let me look around a day or two. Eric Small Cox Logo
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Speed Plane Tank Size

Post  RK Flyer on Sat Jan 13, 2018 2:24 pm

Roddy, Thanks for your help, I am going to start with the 7 cc tank that you sent me last year! I'll test it and then go larger if necessary!

Getback...Thanks for your offer, I just bought a good used Tee Dee from Dane Martin, He made me a very good deal!!

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Re: Speed Plane Tank Size

Post  roddie on Mon Jan 15, 2018 3:58 pm

RK Flyer wrote:Roddy, Thanks for your help, I am going to start with the 7 cc tank that you sent me last year! I'll test it and then go larger if necessary!

Getback...Thanks for your offer, I just bought a good used Tee Dee from Dane Martin, He made me a very good deal!!  

RK Flyer  Flying

Geez.. I'd forgotten that I'd sent you that tank. I hope it works for you. It's a uni-flow.. so be sure to cap the top tube for operation. It passed a leak-test.. but has not been flight-tested.




Those little tanks were fun to make! Hard-soldering can be very enjoyable.






This is my Rare Bear tank..





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