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 first day with a whiplash (193.8)

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Old 11-25-2002, 11:03 AM
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Daryl Lane
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Default My first day with a whiplash (193.8)

Engine Jett bar stock 45R using 20/20 fuel,prop 8.8-8.9 APC,Plane weight 4.6 LBS,wind 5 MPH,Jet traps to record speed (193.8). Does this sound about right?.I think the plane will run over 200 MPH,Will try again next week. thank all for the help.Daryl Lane
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Old 11-25-2002, 01:32 PM
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Default engine

what engine is that? jett doesnt make a 45 do they?
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Old 11-25-2002, 01:42 PM
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Daryl Lane
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Default My first day with a whiplash (193.8)

Yes Jett builded this engine for me last week
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Old 11-25-2002, 01:47 PM
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Daryl Lane
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Default My first day with a whiplash (193.8)

This is a destroked 50.
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Old 11-25-2002, 01:50 PM
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Default 45

why is this better than the 46 or the 50 for that matter. i got a 60 trying to get max speed.
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Old 11-25-2002, 01:56 PM
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Daryl Lane
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Default My first day with a whiplash (193.8)

The engine runs smoother,less viberation to plane and fuel system
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Old 11-25-2002, 05:29 PM
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Default My first day with a whiplash (193.8)

Daryl, have a look at this thread.
Another Whiplash does 200+ MPH

According to the infomation there, you need an engine to turn 27-28k to reach those speeds.
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Old 11-25-2002, 05:44 PM
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Default rpm

This prop has a 8.9 inch pitch. That 10% more than the 8. That allows rpms to drop by 10%. So you only need 24,000 which is reasonable.

A wise person has previously stated on this forum that you need more pitch than diameter to get to 200 mph. It looks like this 8.8x8.9 pretty much proves it. Other 200 mph DD have used 9x10 to do it. My nelson will do it with a 7.2x8.6.
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Old 11-25-2002, 08:51 PM
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Daryl Lane
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Default My first day with a whiplash (193.8)

I am trying to hit the 200 MPH mark, I feel like I have the right plane and engine to do it just, need to work out the pro. My first try was with a Lasar Arrow using a jett bar stock 90 with 9.75-11 APC.It run though the traps at 184.3 not bad for that plane.
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Old 11-28-2002, 04:22 AM
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Default 200 MPH

You'll do over 200 no problem, just keep on trying different settings and props, there's lots of advise and knowledge on the subject, check out some of the other posts, have fun with your whiplash, its a kick in the pants at any speed but especially over 200.

150 MPH--------- Pucker Factor 50%
200 MPH--------- Pucker Factor 80%
225 MPH--------- Spinkter collapse
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