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

what is extreme speed?

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Old 07-29-2002, 05:07 PM
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nosmallcrash
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Default what is extreme speed?

120MPH?
190MPH?

or what?
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Old 07-29-2002, 05:42 PM
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tmproff
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Default what is extreme speed?

4mph can be extreme.......ly slow!
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Old 07-29-2002, 07:36 PM
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gubbs3
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Default what is extreme speed?

Fast enough to make you say "WWWOOOOWWWW!!!"
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Old 07-29-2002, 07:56 PM
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evan-RCU
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Default what is extreme speed?

It used to be about 60mph, then anything over a hundred, then 135, 150 now it's 200. It'll stay at 200 for awhile it looks...unless I hit the Lotto
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Old 07-29-2002, 11:00 PM
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BruceDana
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Default what is extreme speed?

Extreme speed this that which is not obtainable. Think about the physics, what RPM would a model airplane propeller, say an 8" pitch, have to turn to move the airframe at 200 MPH? Remember, the airframe has drag and no propeller is 100% efficient.
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Old 07-29-2002, 11:29 PM
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RSands
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Default what is extreme speed?

Whatever keeps youir mind on the edge of not being able to stay ahead of the plane. Really comes down to two things: your skill level, and how bad your addiction to adrenalin has gotten
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Old 07-30-2002, 11:04 AM
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MMallory
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Default what is extreme speed?

I define extreme as being fast enough to make everyone else land and watch your entire flight (every time you go up).

Mark M.
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Old 07-30-2002, 12:04 PM
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tmproff
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Default what is extreme speed?

Ok, just did some math here for fun.

200MPH X 5280 Feet in a mile = 1,056,000 FPH
1,056,000 FPH X 12" = 12,672,000 IPH (Inches per Hour)
12,672,000 / 60 = 211,200 IPMn (inches per minute)
211,200 IPMn / 8 (for prop pitch) = 26,400 RPM

SO! if using an 8 pitch prop at 100% efficency and a plane with zero drag, your prop would have to be hitting 26,4000 RPM!!!
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Old 07-30-2002, 12:23 PM
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Default what is extreme speed?

MMallory, that was funny because thats just what happened the last time I flew my airplane! Nobody wanted to run the risk of getting in it's way.
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Old 07-30-2002, 11:05 PM
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BAGOSTIX
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Default Extreme Speed

definition of Extreme Speed:

A "Whiplash" with a Jett50 BSE or any ducted fan engine...
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Old 07-31-2002, 12:57 AM
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soarrich
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Default what is extreme speed?

Originally posted by tmproff
Ok, just did some math here for fun.

200MPH X 5280 Feet in a mile = 1,056,000 FPH
1,056,000 FPH X 12" = 12,672,000 IPH (Inches per Hour)
12,672,000 / 60 = 211,200 IPMn (inches per minute)
211,200 IPMn / 8 (for prop pitch) = 26,400 RPM

SO! if using an 8 pitch prop at 100% efficency and a plane with zero drag, your prop would have to be hitting 26,4000 RPM!!!
Doable with a Nelson, well maybe not the 0 drag and 100%

10" pitch =21,120

Doable with ducted fans engines.

12" pitch =17,600

Most good .45 with pipe.

I ordered my DD Sat, come on UPS, my Picco .45DF is waiting.
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Old 07-31-2002, 03:03 AM
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Default fastest

We would take any challenge, same engines, same pipes, same amount of fuel and same props, our whiplash against most any plane out there in the same size range..

We will be doing a time trial very soon with a very special "whiplash" and a very special engine, it may seem far fetched but we are shooting to break 280 mph.. very do-able.

we'll post the speed trap results soon..

the beauty of the whiplash is that the airframe can take anything you throw at it, extreme speed, hard landings, briar patches, sugar cane, you name it...
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Old 07-31-2002, 12:18 PM
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tmproff
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Default what is extreme speed?

WOOT! it'll take sugar cane!!! I'm sold
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Old 07-31-2002, 09:42 PM
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Flyboy Dave
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Default Extreme Speed ?

That's the speed at which the guy next to you...has to wear hearing protection, from the sound of your knees banging together.

Whip-lash and Dust flyers usually wear knee pads under their trousers...so as to keep the "banging" under 98 db., and causing hearing loss.
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Old 08-01-2002, 01:31 AM
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Default what is extreme speed?

When people say "that is crazy fast"

or "that is the fastest prop plane I have seen"

I believe extreme speed has been achieved.
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Old 08-01-2002, 01:52 AM
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Default speed

At 200+ mph, you're covering a whole lot of real estate in a short amount of time, better have good eyes and reflexs, not to mention very big family jewels.....
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Old 08-01-2002, 01:52 AM
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ChuckAuger
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Default Re: Extreme Speed ?

Originally posted by Flyboy Dave
That's the speed at which the guy next to you...has to wear hearing protection, from the sound of your knees banging together.

Whip-lash and Dust flyers usually wear knee pads under their trousers...so as to keep the "banging" under 98 db., and causing hearing loss.
Hey Dave! That's how I tune my engine..when my knees knock in rhythym with my engine, I know it's set! LOL
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Old 08-01-2002, 03:49 AM
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Default Speed...what speed ?

Chuck.....I got a LOL out of that one too...

True story....this spring I put up that Cermark 40 size F-20, with the long-pipe Rossi .45.....I set it out out and punched it...it burburbled for a few seconds, and came on the pipe...
...it started "broadyin'" and skiddin' around ....I pulled her up, and brought her around back past us....and it was screamin' even more...( I wasn't really ready for it )....gave her 2 clicks left, and two clicks up, and banked her left to come back.

In just a few seconds....the little plane was gettin' real small...real quick...came back by, just screamin'...and made another left. My Bud "AIR-Gar" was standin' beside me, and I handed him the transmitter...and said "take this".

He looked at me as he grabbed the sticks...and I was doing about 180 JPM...( that's jumps per minute )...cause my head was literally bouncing up and down from the adrenalin in my knees and ancles, and my thumb was shaking so bad...I could no longer fly the plane ! :stupid:

Had it not been for the "mind lock", I could have perhaps thought about maybe....throttling back a tad...(that might have been a good idea)

We still pop a top, and get a LOL out of that one...
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Old 08-01-2002, 11:09 PM
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Default what is extreme speed?

Hey guys,

I'm just replying to verify that the (FlyBoyDave) knee knockin' repetitions were considerably more than the RPM's of the motor!

Was it "extreme"? For him at the time, maybe, but to me, this had not quite reached the "extreme".

"Extreme Speed?" It truly is in, "the eyes of the beholder".

Gary
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Old 08-02-2002, 12:35 AM
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Default what is extreme speed?

Went flying today with my Surprise 9 on 27 cells.
F5B plane, 16x16 carbon folder, hits about 140 in three seconds after launch...lots of fun. see at Shredair.com under F5B planes.
Putting together an Avionik D99, 7 cells, hacker F5D carbon, 40" span,fiberglass,kevlar,carbon,made in mold(like the Surprise),
with a 9 cell batery, they have been hitting around 180-200mph in competition. Mine will be a for fun flier, maybe 160+
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Old 08-02-2002, 07:29 PM
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Default what is extreme speed?

Sorry to get over technical but the Avionik D-99 does not hit 180-200mph on the course in competition. On 9-1700 cells it is on par with Nelson powered Q-500s which would put it at or around 165mph-170mph. They can reach 180+mph if you put it into a dive but 200 is dreaming. The wing and/or ailerons would most likely flutter if you went 200 because it is built light for racing. I flew the first Avioniks imported into the US and have been racing them since.
I will be building a purpose built speed plane electric power for 200+mph in the next 6 months. It will most likely be using 18 cells and pull about 1200 watts. The fastest speed trapped electric plane that I know of was Thomas Pils' direct drive powered F5B plane on 27 cells that went 224mph. That was in 1998. The newer F5B planes with geared big props can maybe hit 180 flat and level but they go straight up at about 120mph from launch.
Whatever the case, you'll love your Avionik because even at 150+mph, it does feel like 200mph. There aren't too many 1/2A size airplanes that can go that fast.
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Old 08-02-2002, 07:45 PM
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Default what is extreme speed?

How about a 100" wing span running around 250 mph?
Go to a Giant Scale pylon race some time. That's extreme speed.
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Old 08-02-2002, 11:05 PM
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Default what is extreme speed?

Thank you Troy,

OK, so I spouted off sayin what I heard, shoulda checked it out first...

Actually, I thought 200mph is what the 2002 F5D Pylon Worldchamp did to go the distance he did in 66 seconds..
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Old 08-03-2002, 03:00 AM
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Default what is extreme speed?

The fastest RC airplane ever recorded was 250 mph I believe. Now, thats fast!! Someone should make a RC airplane that goes at Mach 1 .
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Old 08-03-2002, 06:12 AM
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Default what is extreme speed?

No problem crash, I remember how excited people were at the time the 66 was made and I felt the jet blast . I was actually a caller for another pilot during the race that he did the 66. Robert is truly a gifted pilot. Crash, where do you live?

BTW: the fastest recorded RC plane was a glider flown off the Swiss Alps through speed traps at a speed of around 310mph. It was done over a decade ago. I'm sure a jet jock will soon be able to top that provided it's done out in the middle of nowhere and they are way over the AMA sanctioned 1 to 1 power to weight ratio. Just let me know when and where and I'll be there with a camcorder rolling!!
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