Jett 90 in F-4 question  
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Jett 90 in F-4 question - 4/11/2004 9:39:04 PM   
zwflyboy


 

Posts: 5
Joined: 4/11/2004
From: Orlando, FL, USA
Status: offline 		I have a question concerning prop selection for my Jett 90 in my Great Planes phantom. The plane is flying pretty good on a 12X6 prop turning right at 13,900 with 15% fuel. What would be a good prop on this engine to get a little more speed out of this plane (11X8 maybe)? This plane is big and bulky so I am not expecting too much in the speed department, but any increase would help it overall. Any information would be ver helpful.

Thanks
       Post #: 1

RE: Jett 90 in F-4 question - 4/11/2004 11:50:41 PM   
Razor-RCU



Posts: 5285
Joined: 3/21/2002
From: Ramona, CA, USA
Status: offline 		How much runway does it take to get off now and how much extra do you have? The general rule of thumb is down 1 in daimeter up 1 in pitch, however a 12x6 already seems small- similar load to an 11x7 or 10x8/9..

Jett-90 owners?

(in reply to zwflyboy)
       Post #: 2

RE: Jett 90 in F-4 question - 4/12/2004 1:50:35 AM   
daven



Posts: 6897
Joined: 12/7/2001
From: Andover, MN, USA
Status: online 		I'm not thrilled with this post. I have a Jett .90 that I am currently installing on a Hangar 9 Corsair.

I was hoping I could start with a 13x6 and go to a 12x8 or 11X9 at some point. If you are only turning 13,900 with a 12x6 I am very concerned.

That seems low...???

Any other Jett .90 owners out there?

Is that the Torque, or Speed version?

_____________________________

Dave Norman

klasskote.com
supertrc.com

(in reply to Razor-RCU)
       Post #: 3

RE: Jett 90 in F-4 question - 4/12/2004 2:22:51 AM   
Razor-RCU



Posts: 5285
Joined: 3/21/2002
From: Ramona, CA, USA
Status: offline 		Airgar?

(in reply to daven)
       Post #: 4

RE: Jett 90 in F-4 question - 4/12/2004 5:05:18 AM   
AirGar



Posts: 1121
Joined: 12/5/2001
From: Alta Loma, CA, USA
Status: offline 		11x8......period!

_____________________________

>>>>>> Un-Certified Speed "Demon"!! <<<<<<
(((Revver numero three'o)))

(in reply to Razor-RCU)
       Post #: 5

RE: Jett 90 in F-4 question - 4/13/2004 3:25:37 AM   
CheezeyPoof



Posts: 136
Joined: 1/3/2004
From: a, USA
Status: offline 		I have the Jett .50 and .90 . Airgar is relating to the F-4 for speed. Your Corsair is still going to move right along with a 12/8 or 13/8. You know I have a couple warbirds that are engine overpowered. I just pick out a prop and fly it. I would stick a 13/ 8 on it, come by for a low pass and then go vertical. If it hold well, keep it. If not, drop down a tad


quote:

ORIGINAL: daven

I'm not thrilled with this post. I have a Jett .90 that I am currently installing on a Hangar 9 Corsair.

I was hoping I could start with a 13x6 and go to a 12x8 or 11X9 at some point. If you are only turning 13,900 with a 12x6 I am very concerned.

That seems low...???

Any other Jett .90 owners out there?

Is that the Torque, or Speed version?

(in reply to daven)
       Post #: 6

RE: Jett 90 in F-4 question - 4/14/2004 4:19:18 PM   
bob27s



Posts: 4821
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		You should be turning an APC 12x6 prop WELL over 14,000 with the 90L.

You did not mention the brand and type of prop you are using. Can you provide that for me ?

The APC 11x8 is my prop of choice for the application. The 90L turns that over 15,000 in a similar F4 application. An 11x9 lugs down to about 14,500.

If you have the standard 90L jett-stream muffler, you will want to prop the engine turn over 14K with any prop. The muffler RPM range is from about 13K up to about 17K.

Tell me a bit more about the installation and prop

Bob Brassell

bob27s@hotmail.com
webmaster@jettengineering.com

(in reply to zwflyboy)
       Post #: 7

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