RE: MAGNUMR NOT FAST ENOUGH
130mph? Your not pushing it hard enough..!! She's defininately good for over 150 and faster downwind.
I suggest you fly giant 'U'. Take her up VERY high, dive her vertically and pull gently up to level for short pass infront of you, that is if you don't do that allready. Some just fly her flat and may bleed the speed off in tight turns, which she doesn't like.
Cutting an inch off is for the use of a 8x8 prop and will see rpm hit 20kplus so, yes speed will go up.
HOWEVER;-Weston advise that for MAX speed an 8x10 is used WITHOUT cutting any of the manifold pipe, lauches will require a push, unlike a a 9x7 where its easy to self launch and it go vertical and good all round prop for average speed.
What type of prop are you using? What fuel/nitro content? What plug?
Heres some magnum in action in the 150 band.
[youtube]http://www.youtube.com/watch?v=DTsP6bKN5NA&feature=channel_page[/youtube]
My magnum now has 193 flights on her.!!