Payload Question
 

Hi,

I have a friend with a 6" wingspan twin engine R/C plane. They are 0.25 cubic inch engines (about 4cc's)
we are trying to load a pro-camera into it but it weighs around 13 lbs. Would those engines generate enough lift to take off?

Thanks in advance

RE: Payload Question
 

Sorry i mean 6' Wingspan not 6"

RE: Payload Question
 

i really dont think you would be able to, it sounds underpowered already...

RE: Payload Question
 

If you don't mind me asking, what kind of engine size would you recommend?
With the airframe I think its 30-35lbs total

RE: Payload Question
 

Do you realize how much 13 pounds is? Might as well strap a brick on top.

RE: Payload Question
 

Oh come on. You know twin .25 engines aren't going to lift off 30lbs.

RE: Payload Question
 

Neither will .60

My cam corder don't weigh 13 pounds.



Your graphics crack me up redbirdy[sm=lol.gif].

RE: Payload Question
 

well its an older model i suppose the solution would be to get a small wireless cam and then record it that way

RE: Payload Question
 

or replace the .25's with 2.5's

RE: Payload Question
 

is this a wind up?you could put 2 merlins on it and it still aint going to lift that camera!

RE: Payload Question
 

That camera is just too much to ask for a pair of 25's. The wing area is just not enough, period. To lift that kind of woight you will need at least around 100 plus inches of wing span. And quite a bit of engine. Say 4 cubic inches or so. The vibration would make taking pictures tough.

You have the right idea. A small servailance camera and a telemetry module would do it. Look in RCM and MAN. I have seen package deals at a reasonable price. I would however swap out the 25's and go with 32's or so. The Irvine 39 I think would be a fantastic choice. Same size as a 25 and the power of a 40. Good luck with the project.

Mark Shuman

RE: Payload Question
 

thank you all for your help

RE: Payload Question
 

Well to the contrary to what everyone said,

take a look at http://www.sae.org/students/aerodes.htm

SAE Aerodesign competition 1 O.S. 0.61 FX can carry 33lbs of load+airframe in 10' plane and can take off in 200ft.

See the photos of the planes. http://www.sae.org/students/ade2004pics.htm

I bet 2 O.S. 25FX's can lift 13lbs payload if a single .61FX can lift 33lbs with a proper airfoil and airframe.

But of course there are easier ways to do this and I personally won't put a pro camera weighing 13lbs(sounds expensive) on 2x .25s.

RE: Payload Question
 

That's not contrary to anything that was said.

RE: Payload Question
 

I am saying yes to the following question with an example in .61FX and with proper airframe and airfoil.
"Would those engines generate enough lift to take off? "

You are saying No.

So I guess it is contrary to what was said.

contrary=opposing, different.

And I am also adding that this is not the logical way to do, and there are easier ways.

RE: Payload Question
 

I agree Cobra. You sure can lift that kinda weight with the airplanes entered in those competitions. However they are finicky and just not good fliers in general. Not to mention the use of exotic materials and building techniques. Our answers were to the poster's question on a twin of the size mentioned. He may be able to use a Bruce Tharp Super Flyin King and get the job done. But even then the plane would need modification. But certainly doable. The best answer is to use lighter gear. And boost the engine size a little.

BTW I am not knocking you in any way. I am glad you brought those points in. Diversity is what this site is about. Who knows, maybe you gave some food for thought that brings about the solution to the problem.

Good luck with your project.

Mark Shuman