ORIGINAL: Mr Cox
The ''Cubic'' wingload, weight(g)/wingarea(dm2)^3/2, is good guide to how the plane will behave. A number of 4-6 is typical for free-flight, 8-10 is a good sports plane and 12-14 (and up) is warbird territory.
Then you choose an engine to suit. A thrust of 1/3 of the weight is about minimum for sustained flight, a thrust near equal to the weight is fine for sport flight and for 3D you need more power.
It is as simple as that....
ORIGINAL: Mr Cox
The ''Cubic'' wingload, weight(g)/wingarea(dm2)^3/2, is good guide to how the plane will behave. A number of 4-6 is typical for free-flight, 8-10 is a good sports plane and 12-14 (and up) is warbird territory.
Then you choose an engine to suit. A thrust of 1/3 of the weight is about minimum for sustained flight, a thrust near equal to the weight is fine for sport flight and for 3D you need more power.
It is as simple as that....
Well, my DELTA is 48" for the root, the overall WS is 60", and it weights just over 10 lbs
so, if I look at the R. or L. half it has a 6" clip on the wing tips - making the cverall shape of the 1/2 wing - a screwed up rectangle. I think it's what is referred to as a TRAPEZOID
According to a variety of research - my DELTA is now at 780 sq. in. and just around the 10 lb. area. Accordingly, this all important number is coming in at around "30".
If I were around 1/2 that size - say 36" WS and in the 6-7 lb area. the loading is almost the very same!
A small .40 ENYA i used to have in the late 80's made the 36" version kick out at about 45-+50mph.
This LARGER version of the same plane - as I say - is 60" WS.. I now have a ROSSI .81 DF to power this larger bird.
The DF is for "DUCTED FAN". - with a tuned pipe!
From what I've seen so far, the old ROSSI engines are like running straight TURBO.
Now then, PROPS - I have an 11/7 MASTER AIRSCREW (PUSHER) on it - I also have some smaller ones, too
What to do?
I've run the ROSSI a couple of times but I'm waiting for a solid BULLET for the nosecone. It'll thread right INTO the prop shaft.
Right now, I barely have enough threads to keep it on
marwen1