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Kirkds
Joined: 07 Apr 2009
Posts: 52
Location: Michigan
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 Posted: Mon Apr 27, 2009 8:09 am Post subject: Warp Drive on my Firestar? |
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I'm going to put a Warp drive prop on my Firestar that has a 503, twin carb, B box. What is the best one, 2 blade or three blade and what diameter? Thanks! Kirk
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Mon Apr 27, 2009 8:50 am Post subject: Re: Warp Drive on my Firestar? |
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| Kirkds wrote: | | I'm going to put a Warp drive prop on my Firestar that has a 503, twin carb, B box. What is the best one, 2 blade or three blade and what diameter? Thanks! Kirk |
I believe the WD in 3 blades is a little over the MOI limits of the B box. Someone did some MOI measurements (can't remember who or where) a while back and I believe the WD was found to be over in terms of inertia in 3 blades. Even so, the throttle response will be pretty poor and the motor will be hard to start, etc.
If it were me with a 503 B box, I'd start with 66" in 2 blades and run the taper tip for both performance reasons and to keep the MOI down. Course, Daryl and the folks at WD will know all the numbers on this.
I had a 68" 3 blade taper on my FSII with the 3.47:1 C box. That's about the best possible combination you can get on that plane, tho it does add extra weight in kind of a bad place.
LS
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LS
Titan II SS |
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HShack(at)aol.com
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| Posted: Mon Apr 27, 2009 5:27 pm Post subject: Warp Drive on my Firestar? |
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With the "B" box, I'm sure the 3 blade has too much inertia, & I THINK the 2 blade may be too much. Call Warp.
Howard Shackleford
FS II
SC
In a message dated 4/27/2009 12:14:15 P.M. Eastern Daylight Time, kirkds(at)dishmail.net writes:
| Quote: | I'm going to put a Warp drive prop on my Firestar that has a 503, twin carb, B box. What is the best one, 2 blade or three blade and what diameter? Thanks! Kirk
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