Fuel Tank Size

[Raven]

I am currently building a warbird that will be in the 30-35 lb range. I will be putting in an eme 70 twin or dle 85. My question is , how big of a tank would i require for a 7 minute flight with a small reserve? I am thinking a 500 ml fiji water bottle but unsure if it will be adequate enough.

 

[Flyingjon]

I fly a Da 70 and I put a 750ml Fiji in it. I have my timer set on 10 minutes and usually land with around half a tank. That's in a 3D plane so I may not be using as much throttle as you may be. I would think 500 ml would do it though.

 

[bigblueswope]

That'll be fine. 12 minutes of 3D on my DA 70 and plenty of reserve.



BJ Swope

 

[ChickenBalls]

Sounds bout right, 16oz get ya there, 20 oz would give you some wiggle room. I've got a 24oz on my 85, and usually come down with half tank.

 

[Raven]

And what are the rough AUW of your planes? I am assuming you fly at half throttle or less? Cant get 750 ml fiji here in Canada, only 500 ml and 1 L. 1 L is too much i.m.o. Thats why i am thinking the 500 ml. But as stated it is going to be heavy as most of these builds come in just under 35 lbs....FYI nick ziroli p-47 92"

 

[Flyingjon]

I'm at 21 lbs with a set of tuned pipes and usually fly 1/3-3/4 throttle. One thing to note, the 750 ml bottles are the same length as the 1 l, just smaller around.

 

[Raven]

Thanks for the info man, maybe i will try to source a 750 ml bottle. My thinking is that add another 14 ish lbs to your plane and probably 3/4 throttle flying a 500 ml MAY be pushing it. But i will wait for others to chime in as well. My first giant scale and kit build so i dont eanna dead stick this due to lack of fuel ya know, lol.

 

[BalsaDust]

I fly ten minutes on a 18lb plane with a dle55 and 500ml tank and land with right at 1/2 tank. Most of the flying on that plane is around 2/3 throttle.

 

[stangflyer]

Sounds bout right, 16oz get ya there, 20 oz would give you some wiggle room. I've got a 24oz on my 85, and usually come down with half tank.

Would have to agree with Donnie here. Having just a smidgen more of fuel is not a bad thing. I'd rather have a little extra in reserve just in case, than to run out at a "REEEEEALY" bad time. jmho

 

[Jetpainter]

I fly ten minutes on a 18lb plane with a dle55 and 500ml tank and land with right at 1/2 tank. Most of the flying on that plane is around 2/3 throttle.

Man your getting way better mileage than me. I average between 12 and 14 ounce on a ten minute flight with my DA50's and GP61. Of course I do like the high speed high energy stuff.