Throws for Extra 300
11-19-2002 | 06:02 AM
#1
Thread Starter
Member
Joined: Nov 2002
Posts: 85
Likes: 0
Received 0 Likes
on
0 Posts
From: Islamabad, PAKISTAN
Throws for Extra 300
I and my friend just finished a scratch bulilt Extra 300 wing span 68". The plans were Carl Goldberg Extra 60-90. But the powerplant we used are OS 108 (BX 1) on each plane. Can someone suggest throws for 3D & and sports flying. The reason we over powered our planes is, elevation above see level, and the fact we always use home blended fuel with NO nitro !
regards
Dr R H Malik
regards
Dr R H Malik
11-19-2002 | 03:29 PM
#2
Junior Member
Joined: Oct 2002
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
From: HAVERHILL, MA
Throws for Extra 300
You can try and call Tower Hobbies/Carl Goldberg for the throws if your surfaces are proportional to the CG Extra.
<u>Don't tell them is a scratch built!</u> Without knowing the surface areas, it would be imposible to predict what degree of deflection is needed. Assumming that all variables and ratios have been kept, generally a dual rate can be set up with 15-20 degrees of throw on elevator and 10-15 on ailerons as the low rate with all you can get for high rate( 60 Dgrs). Use ~20-25% exponential. I would set the high rate just a little above low initially(25-35) just in case the low is not enough and then increase to 3D as you become more comfortable with the aircraft.
<u>Don't tell them is a scratch built!</u> Without knowing the surface areas, it would be imposible to predict what degree of deflection is needed. Assumming that all variables and ratios have been kept, generally a dual rate can be set up with 15-20 degrees of throw on elevator and 10-15 on ailerons as the low rate with all you can get for high rate( 60 Dgrs). Use ~20-25% exponential. I would set the high rate just a little above low initially(25-35) just in case the low is not enough and then increase to 3D as you become more comfortable with the aircraft.
