RotorJockey
70cc twin V2
ok what's the deal with no discussion on venting? I'm almost done building and I realize there is no venting provided for underneath...that is...no exit venting for my GT33. The 71 Slick has a vented cover you can put underneath to provide for exit air. I've searched all the threads on Bigfoot and there is very little discussion on this aspect other than an agreement that the manual does not discuss it. I know it is needed; I'm thinking that I'll open up the panel in the cannister tunnel just behind the landing gear cause that one seems the right size. No panel for now, but I guess I can make one.
Anyone with a gasser Bigfoot have any input here?
We did a few different things with Arnold's Bigfoot. We are running a DLE-35 in it.
First he cut and covered some thin ply with slots in it very similar to the panels on the bottom of the 50/100cc'ers. It still got a bit warm.
So during the break-in we ran it with the holes just cut out like you said and kept opening up the cowl in front of the engine til we got the temp below 250 in flight.
Now he has built some reverse scoops to fit the same holes that create vacuum to draw air through the cowl.
It has over a gallon of fuel through it and the rearward scoops seem the best option for maintaining a scale appearance and keeping your engine cool.
I'll see if I can get Arnold to shoot some pics of them tomorrow to post up for you.
Fred