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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> LEAD TIME?
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LEAD TIME? - 2/4/2007 3:44:44 PM   
sparky925



Posts: 209
Joined: 8/5/2002
From: huntsville, AL, USA
Status: offline 		What is the current pruduction lead time for a 90?
And what 90size is best for a 9lb ish old style pattern ship?
I am looking to put 1 in a BPA ship for Huntsville contest in August!!

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Do it high, Do it low, just do it!!
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RE: LEAD TIME? - 2/5/2007 2:33:26 PM   
bob27s



Posts: 4637
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Lead time has been running about 3 weeks on the bigger engines. You can confirm more specifically with Dub jettengr@sbcglobal.net

Depends a bit on the plane whether Rear or Side Exhaust is needed.

If the plane is heavy, and you have the prop clearance, I would stick with the standard SJ-90L or FIRE-90L engine and go with a 12x6 prop - the bigger diameter will help with vertical performance on a heavy plane. No shortage of speed and energy entering the manuver either. The 90L is a bit more versitile when it comes to prop selection - likes to run with peak ground rpm anywhere from about 12,800 to 15,000. A FIRE configuration will be tuned to the rpm and prop you wish to use as a baseline.

The 90LX is a monster powerhouse - but we find it runs best with 11x7 - 11x9 props. No problem going this way in general - an 11x8 turning 15K+ rpm will get you tons of vertical too. This engine must be propped to turn 14K+ peak ground rpm to run properly. Aircraft generally in the 650-775 sqin wing and about 8 lbs will really enjoy this engine

Bob


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Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to sparky925)
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RE: LEAD TIME? - 2/5/2007 2:39:34 PM   
sparky925



Posts: 209
Joined: 8/5/2002
From: huntsville, AL, USA
Status: offline 		Thanks for the info

I would like to turn an 11x7.75 or so...
A little more like it was back then!!1
I will be in touch in a week or 2 to see aboiut an order.
It would be side exaust, 90LX i suppose

_____________________________

Do it high, Do it low, just do it!!

(in reply to sparky925)
       Post #: 3

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> LEAD TIME?
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