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

Radar readings on my Patriot

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Old 07-20-2004, 08:11 AM
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fred685
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Default Radar readings on my Patriot

Had a Stalker radar gun the other day at the field. Pretty disappointing to see how fast your actually going. My Patriot is built stock without fake intakes. Has a Jett 50 APC 9-9 prop and Spring-air retracts. Of course the air manifold started leaking at the field so all readings were with the wheels down. The fastest reading I got was 134 MPH. That was from a big dive. I tried a 9-7.5 APC and lost speed. What was disappointing was some 35% aerobatic airplanes were clocked in the mid 120's. The only other speed type plane clocked that day was a Diamond Dust with an MVVS 40 and some sort of APC pylon prop. He only got 125, so I didnt feel to bad. I'll fix the manifold and get some numbers with the wheels up.

Fred
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Old 07-20-2004, 08:33 AM
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bob27s
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Default RE: Radar readings on my Patriot

Thats not all that bad Fred..........

With the gear up, you will likely find something along the lines of 130 mph in level flight. The Patriot is a big plane, and it takes a lot to get it to move a whole lot faster than that.... but generally, with a 50 installed, the top end is rarely much over 140 mph.

The 9x9 is a bit heavy for the SJ-50. Try an APC 9x8 next time out. Let the engine unload. You want to prop it so it turns over 17,000 rpm peak on the ground, then back off 600-800 rpm before launch.

Bob
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Old 07-20-2004, 10:31 AM
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daven
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Default RE: Radar readings on my Patriot

I would suggest trying a 10x7 sport prop. Works well on my SJ .50 powered Kyosho Spitfire. It was faster than all the 9" props I tried, and I have a lot of them.
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Old 07-20-2004, 11:25 AM
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Default RE: Radar readings on my Patriot

Fred,
Those readings are not that far off. The fastest I have ever had mine clocked was 154 and that is with a west .50 v1 and pipe, turning a 9X8 APC gear up. With my Jett .50 I was never getting much more then low 140's That is the same engine that pulled my Magnum to 188. I plan on getting my new Magnum R clocked this weekend. It is good to have friends that are cops with radar guns.

Dave
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Old 07-20-2004, 01:13 PM
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Default RE: Radar readings on my Patriot

good call Dave.....

I forgot about that. For some reason, the APC 10x7 seems to turn up nearly as well at a 10x6...... pulls hard when it unloads in the air.

If I ever manage to get my ARF patriot built, I am going to try and install the full size pipe on the SJ-50. Should be able to match the West performance with the pipe.
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Old 07-20-2004, 02:04 PM
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Default RE: Radar readings on my Patriot

I really liked the 9x9 on my Pat. (Jett-50 SPring airs etc.) better than the 9x8 or 10x7 apc

I have a Jett-50 going on my Patriot arf we'll see what happens-
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