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

My New Cermark F-20 Tigershark

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Old 02-27-2003, 03:24 AM
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shawnkappner
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Default My New Cermark F-20 Tigershark

Here is a picture. This is my first time posting a picture so here goes...
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Old 02-27-2003, 03:38 AM
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shawnkappner
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It has a Jett .50 for power turning a 9X8.5 APC prop. The Graphics were done by Dennis Kirby. He did about half of the TOC planes in 2002. This was covered 100% in red ultra coat when I first got it about a month ago. With a little work, it turned out pretty nice...
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Old 02-27-2003, 03:46 AM
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shawnkappner
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It weighs 5 lbs 12 ozs.
Balances 4 3/8" from the leading edge
Jr 531 Servos
6 cell 1100 nicad pack and receiver are under the plywood with the lightening holes.
Carbon fiber pushrods

I have built many planes but this is my first speed plane. It appears to be a very nice ARF. I cant wait until the snow melts to fly it!
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Old 02-27-2003, 03:50 AM
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ChuckAuger
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Default Well I like it

Looks pretty nice to me!

I'd be wanting to fly that one, too.
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Old 02-27-2003, 03:51 AM
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The Jett .50 is incredible. I have only run it on a test stand to break it in. After 3 tanks I was spinning a 9X7 APC break in prop at 18,600 RPM!

Thanks for looking at my new toy!
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Old 02-27-2003, 05:02 AM
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Default dude...

SAWEEEEET

I gotta get me one of them-
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Old 03-02-2003, 01:37 AM
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Default My New Cermark F-20 Tigershark

shawnkappner, That engine is over rated I had one in a Patriot and an F-20. My buddies same F-20 with an O.S 46 FX on a performance specialties pipe flew formation next to me. We were about the same speed. What I found out later was that the Dub Jett engines don't spin the the bigger pitch props the O.S engines do. If you try to put a 9X8 on tha Jett 50 you will see your RPM drop as fast as the Dow Jones! In fact, read the statement in your owners manual and it states " don't over pitch". I think you fell for the same trick I did. Those engines are over priced and over rated you will see. All they do is make alot of noise and go nowhere!
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Old 03-02-2003, 03:41 AM
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Default My New Cermark F-20 Tigershark

When I took my jett .50 out of the box it ran 19,200 with a 8.75x7N. I was floored!
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Old 03-02-2003, 12:31 PM
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Default My New Cermark F-20 Tigershark

Originally posted by ledd4u
shawnkappner, That engine is over rated I had one in a Patriot and an F-20. My buddies same F-20 with an O.S 46 FX on a performance specialties pipe flew formation next to me. We were about the same speed. I think you fell for the same trick I did. Those engines are over priced and over rated you will see. All they do is make alot of noise and go nowhere!


There was a guy here recently who put his fist through a new Hangar 9 P-51 and verbally slammed the whole plane. Apparently he was the only person who had a bad kit or was it just his building skills?
You have a good engine which will out perform a OS 46 hands down. We have several of these planes here with Jett 50's to include mine. One actually has a blue one with the 46fx. There is no formation flying. Over proping any engine will yield the same results.
We get about 130mph with ours but remember we are at 5500ft in which we have about a 17% loss in speed and overall performance.
There is something wrong with his picture. Maybe construction, weight, fuel, plugs or he has one of the few lemons. You did okay, Go with it.
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Old 03-02-2003, 10:02 PM
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Default say what?

Ledd4u: You complaining about a Jett engine? The Jett can't handle the high pitch props that the OS can?

Wow- You are right and the other 100 or so folks on here must have it backwards... I get soo confused...

"Insert stupid comment here...then retract with tail between legs!"

james
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Old 03-02-2003, 11:55 PM
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Default My New Cermark F-20 Tigershark

Shawn,,,,

Your plane looks great.
Just to let you know your Cap is doing fine. I have been flying it anytime I can. I probably have burned 2.5 gallons on it since I picked it up from you.

I absolutely love it.
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Old 03-03-2003, 02:51 AM
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shawnkappner
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Default Jett Basher

Now Now Now lets not get too upset at Mr. Jett basher just yet...

I purchased the Jett .50 Sport with the larger muffler option for additional rpms and ran it up on a test stand to break it in and got some decent results with the 9x7. I installed the motor in the Tigershark and read Mr. ledd4u's comments and had to take it for another spin in my driveway using a 9x8 and 9x8.5 which are the props I intended on using all apc. Unfortunately Mr ledd4u wasn't that far of the mark.

9x7 18,650
9x8 17,500
9x8.5 16,400

So far the folks at Jett have be nothing less than outstanding to deal with. When I originally spoke to Dubb Jett, he advised that I should get over 18,000 rpm (Which to me means 18,100 TO 18,200) with an apc 9x8 prop. I read a lot of posts and saw no reason to not believe that this rpm was very attainable on 15% fuel. I was a little suprised when I didn't get close and at the huge rpm drop when I went to the higher pitched props.

I just e-mailed Jett with my results and asked them if possibly I am doing something incorrect or if they could look at the motor and make it "on par" with the rest of their high quality products.

The above numbers are by no means shabby for engines in that general size/ The engine otherwise runs get. Very nice transition and nice idle. However, for the extra $$$ I expected a little more. I have not lost hope!!! I expect Dubb will come through for me. I will keep folks posted.

Hey Wayne, I'm glad the Cap is still doing well. It's good to hear from you.

Shawn
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Old 03-03-2003, 04:26 AM
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Default My New Cermark F-20 Tigershark

shawnkappner, I had the same conversation with him and he got very defensive. He argued that I was not using the correct fuel. He insisted that I purchase Powermaster 15%. I was using Wildcat 15%. I only can state what I observed. Still stand by my statement they are overated and overpriced. The YS 45 is superior to his 40, 46 and 50.
Razor, sorry I hope you did not take that the wrong way.
If you want power and speed try the nelson sport 40. At $350.00 Special order, that engine will spin the 9X9 at over 19500 RPM, with Wilcat 15%. I know I have one. Take that to the bank!
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Old 03-03-2003, 08:30 PM
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Default well..

I was wayy to tired to be posting stuff- my apology to you!

I dolove the YS-45 tho

james
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