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Engine for 11x10 prop - 4/8/2008 1:27:48 AM   
learjet45xp


 

Posts: 56
Joined: 3/22/2007
From: , FL, USA
Status: offline 		Zinger props is introducing a new 11x10 pusher prop. This prop size has been long awaited by me since I fly a keecat. I have limited space between the boom and ground clearance and no one else ever saw fit to make a low diameter high pitch pusher until now. My plane is about 9 lbs dry and I would love to put on a jett motor, which motor would best utilize the 11x10 prop for my plane? Thanks
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RE: Engine for 11x10 prop - 4/8/2008 6:13:56 AM   
Pubhi


 

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Joined: 11/10/2002
From: san diego, CA, USA
Status: offline


quote:

ORIGINAL: learjet45xp

Zinger props is introducing a new 11x10 pusher prop. This prop size has been long awaited by me since I fly a keecat. I have limited space between the boom and ground clearance and no one else ever saw fit to make a low diameter high pitch pusher until now. My plane is about 9 lbs dry and I would love to put on a jett motor, which motor would best utilize the 11x10 prop for my plane? Thanks




Hopefully APC will come along and make a better 11X10 prop after the zinger hits the market. I'm not so sure how much more performance you'll be able to squeeze out of the keecat with a high pitch prop because its a fairly draggy plane...especially with the thick wings and two giant tail booms with servos sticking out of them. By the way, what kind of gear do you have on your plane that makes it weigh 9lbs? When I had the basic keecat running on a tower 75 engine, it weighed no more than 7lbs wet.

(in reply to learjet45xp)
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RE: Engine for 11x10 prop - 4/8/2008 2:27:21 PM   
bob27s



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Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline
quote:

ORIGINAL: learjet45xp

... which motor would best utilize the 11x10 prop for my plane? Thanks


An OS 91FX with a jett-stream muffler on it .... likely a good prop and performance match. The APC tractor 11x10 runs about the same as a 12x8, and that has proven to be a good combination of performance up around 12,500-13,000 rpm. The Zinger prop will be similar in performance. Hopefully they go with a slightly narrower blade than the standard 11x10.

Not a good prop match for a Jett 90L, and definately too much load for the 90LX

The 90L and 90LX run best on the big pushers with the 11x7 and 11x8 pusher props. Best to just let them turn WAY up in rpm.

Although it is not available yet, this prop might be a good place start if one wished to "work" the prop a bit..... thin it down, depitch just slightly. If you could get a resulting rpm up over 13,500 on the SJ-90L it would probabably perform well in the air.

< Message edited by bob27s -- 4/8/2008 2:31:46 PM >


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Jett Engineering - Engine Mfg Support Forum Host

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RE: Engine for 11x10 prop - 4/30/2008 4:48:08 PM   
gooseF22


 

Posts: 467
Joined: 8/12/2006
From: Fort Wayne, IN, USA
Status: offline 		bob,
what about the 11x10 on my Super tigre .90 with the Jett muffler. am a little concerned about turning it way up? what do you think? It has sustained 14500 rpm so far.

I just got the Jett muffler on it with the graupner 11x8 but havent run it yet. thinkin g that will be a good match.

< Message edited by gooseF22 -- 4/30/2008 4:51:36 PM >

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Goose
old greybeard fighter pilot...Fromeco Pilot

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RE: Engine for 11x10 prop - 4/30/2008 5:11:49 PM   
bob27s



Posts: 4423
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline
The 11x10 should work nicely on the ST. Id not worry about letting the engine turn too much. But it seems to produce its best power around 12,500 to 13,000 rpm. The 11x10 will likely pull it down closer to 12,000 with the jett muffler.... should be ok there.

The 11x8 should be interesting. See what the rpm hits.

< Message edited by bob27s -- 4/30/2008 5:13:47 PM >


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Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

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RE: Engine for 11x10 prop - 4/30/2008 6:38:31 PM   
gooseF22


 

Posts: 467
Joined: 8/12/2006
From: Fort Wayne, IN, USA
Status: offline 		I will let you know what it turns wth the 11x8.

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Goose
old greybeard fighter pilot...Fromeco Pilot

(in reply to bob27s)
       Post #: 6

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