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bob27s -> RE: 4 star 40 race (8/14/2007 2:33:09 PM)
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Hi Coleman....
I will assume for a moment you have to build a box-stock 4-star (no clipped wings)
Jett SJ-46 engine is what you are looking for
Break in on the test stand with a 9x6 (per instructions). I'd suggest using castor/syth blend fuel for this (byrons ?)
Use the standard Jett Stream muffler (skip the full pipe, more drag created than power increased to over come it)
APC 9x7, 9x8, 10x6 or 10x7 --------
If it is a stock 4-star, it will take some experimenting
perhaps try the SS muffler option (higher rpm)
Run an APC 9x7 prop - standard blade.
Note = this muffler setup requires prop selection so the engine turns 17,500 ground peak rpm MINIMUM
For the race, use the coolpower 15% (or Omega 15% if they will let you).
So what is the trade ?
The standard muffler and bigger prop will get the plane off and down to the first pylon quicker.... and will exit the turns quicker.
This will work better if you tend to fly -- well --- not quite a straight line and round turns.
The SS muffler and 9x7 will be likely be faster in level flight, but will bleed energy in the turns - fly smooth.
Much more important than a really honkin engine ----- practice flying the race course!
Every time you touch the controls - ailerons, elevator.... what ever..... it is like slamming on the brakes.
Smoooth.....
Worth noting..... there is a few week lead time on the engines.
If you need one soon, I would suggest calling or emailing Dub very soon to inquire about delivery date.
Bob
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