Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

prop for patriotxl

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Old 12-01-2004, 12:17 AM
  #1  
speedy1379
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Default prop for patriotxl

hello all speed demons,
I'm building a patriotxl with a ST 90 and was
wondering if any one had any thoughts on a
prop for it. I have some 12/10 zingers. Would
these work, or should I try something else?

Thanks in advance.

speedy
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Old 12-01-2004, 09:28 AM
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Cyclic Hardover
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Default RE: prop for patriotxl

Hows the clearance on it. You may want to go down around a 12/7 to start with. The thing here is leave it on for several flights so you can get the feel of it. Then when you decide to change props, you will see an immediate difference which could be better or worse. I use Jett for my speed planes but I do have a couple G90s in other planes like the Shoestring. Very reliable and good engines and very powerful in the right plane on a torque basis but would not be my choice in a propjet.

I would chuck the zingers and go wiht APC, every little bit will help.
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Old 12-01-2004, 12:37 PM
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Default RE: prop for patriotxl

If I went with a JETT, which one should I use?
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Old 12-01-2004, 01:46 PM
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Default RE: prop for patriotxl

.90L with a 12/7 apc. I am not trying to insult your wallet by any means but if your going to build a propjet from a kit. Thats a lot of work. Right now I am building my fourth propjet which is Russian Flanker. This kit is a real pain in the butt and I am not going to go through all this without installing the best there is to pull it around.

Don't be intimidated by the Jett either. It is just as easy to tune up as any of them. No surprises. Compression is so tight that it feels broken but it's not. And the sound of the engine, especially the 90L stand alone.

Also consider retracts or your basically cancelling out everything were talking about . Too much drag with stamdard struts.
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Old 12-01-2004, 03:15 PM
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Default RE: prop for patriotxl

I have spring air retracts on it and I'm going
to leave the intakes off. I'm also considering
lowering the rear deck about 3/4" to decrease
some of the drag. I had the ST 90 from another
plane, so I figuered I would try it. But if a JETT
is the best way to go on this plane then I'll go that
route. Should I go with the Signature Series BSE or
the Sport Jett Engine?
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Old 12-01-2004, 04:25 PM
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Default RE: prop for patriotxl

Speedy,

Either the SJ-90L or the BSE-90L will work well. Both have nearly identical performance. Its more a preference of appearance and wow factor. However the BSE do sometimes come up 200-300 rpm more than the cast case.

A few folks have told me they were running 11x9 props on the SJ-90 and patriot with very good results. Two were located at relatively low atltitudes (NC and LA). One gentleman in South Dakota run a 10x11 prop.

Attached is an image of one XL without the inlets, SJ-90L up front. Looks nice.
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