News:




  • July 19, 2018, 05:31:50 AM

Login with username, password and session length

Author Topic: 1/2 A Speed plane  (Read 583 times)

Offline RK Flyer

  • Trade Count: (0)
  • Lieutenant
  • ***
  • Posts: 68
1/2 A Speed plane
« on: January 12, 2018, 08:06:54 PM »
I am scratch building a 1/2 A speed plane for the first time and plan on using a stock 049 Tee Dee for power. Since I have no experience with Speed Plane's or the Tee Dee  :o I am wondering what is the smallest size tank I can use to get about 15 laps on 35 or 40 ft. lines. I am building a built up fuse & its only 1/2" wide. I plan on opening the fuse 3/8" &  letting the rest of the tank extend out the side.

The design is from the Desert Rat from the Outerzone which ran with a 35 size engine, I have played fast & loose to bring it down to 1/2 A size!  /DV

Can anyone give me an idea of how many oz. of fuel it would need ? Brodak has several tanks from 1/3rd oz up.

 Also if anyone has a 049 Tee Dee for sale please let me know!

Thanks for your help, RK Flyer


Offline Dane Martin

  • 2017
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1974
  • heli pilot BHOR
Re: 1/2 A Speed plane
« Reply #1 on: January 12, 2018, 09:14:00 PM »
This one is almost tricky to answer. 1/4 oz is 8cc which is standard on hot engines. But, that's still a lot of flight time. In my 1/2a proto, I run 12cc. Of course, that's a higher performance CS. So minimum I would try is the 1/4. I guess you could short tank it if it's too much for 15 laps. I got some td's laying around. If you wanna pm me your number.

Offline Paul Smith

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 4565
Re: 1/2 A Speed plane
« Reply #2 on: January 13, 2018, 07:58:51 AM »
I would go with a 1/2 ounce to be on the safe side.  Maybe you should just time it on the bench. 

That being said, on my Perkys, which use 15's, they burn more fuel & run less time in the air. 
So you will need to run longer on the bench than your target air time.
Paul Smith

Offline bob whitney

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1302
Re: 1/2 A Speed plane
« Reply #3 on: January 13, 2018, 08:28:43 AM »
9 CC's  should be plenty for the TD, u are using pressure right??

if u are going to start it and then fly it u might need more .

as someone said u could make the tank a little bigger and then short tank it
rad racer

Offline RK Flyer

  • Trade Count: (0)
  • Lieutenant
  • ***
  • Posts: 68
Re: 1/2 A Speed plane
« Reply #4 on: January 13, 2018, 01:18:00 PM »
Thank you all for your help!!   :D

I am going to start with a 7 cc tank that I have & then go larger if necessary. The Contest I am building this for is only 12 laps & very informal. I am running a stock 049 Tee Dee.

RK Flyer

Offline Fredvon4

  • 2018 Supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1525
  • Central Texas
Re: 1/2 A Speed plane
« Reply #5 on: January 13, 2018, 02:26:53 PM »
RK...I think a good big Hayes 3 oz tank s needed.... just so your plane is nice and heavy and a lot slower than Mine.....

yer buddy
Phred
"A good scare teaches more than good advice"

Fred von Gortler IV


Tags: