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

150MPH 4 cycle airplane/engine combo?

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Old 09-18-2006, 05:43 AM
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rcguy!
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Default 150MPH 4 cycle airplane/engine combo?

Folks,
I NEED to go 150MPH or faster with a 4 stroke. Lets keep the displacement at .100 or less.
Got any suggestions on a plane/engine combo? ARF's only as building time is limited.
Better yet...got any actual examples?
Grass strip take off and landing required!


"Show me the way!" "Help me spend my money!"

Dave
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Old 09-18-2006, 10:01 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?


ORIGINAL: rcguy!

Folks,
I NEED to go 150MPH or faster with a 4 stroke. Lets keep the displacement at .100 or less.
Got any suggestions on a plane/engine combo? ARF's only as building time is limited.
Better yet...got any actual examples?
Grass strip take off and landing required!


"Show me the way!" "Help me spend my money!"

Dave
Tough order there. Hitting 150 with anything is not easy.

Engine - per your description - YS 91 would be required (YS110 would be prefered)
12x12 or 13x10 prop

Cermark Alleycat ? (good plane, really designed for a YS65 4c if anything - but I seem to recall a thread where someone put a 110 in it)

.40 size P-51 ? Guys in CA are flying World Models P-51 ARFs with YS power - moving right along... those might be your best reference as far as what capability is.

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Old 09-18-2006, 11:09 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

I was gonna say YS-91 and Dago-Red or Voo-Doo Mustang. I don't think either will hit 150 with a 91 up front but they are the closest I would think.... More slippery than most-
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Old 09-18-2006, 12:35 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

You may want to talk with the "other" rcguy and see how he does it. He seems to be going a 1000mph in a 65 inch Voodoo. But Razor is right. There are manywho fly that WM 40 Size P-5 or Dago with a YS110. I have a saito 100 in mine. Its about a 110mph plane. If you can get a 4 stroke combination to go that fast, it might be a one flight deal. After landing the engine may sound like a coin change machine
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Old 09-18-2006, 06:31 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

I'll look into the suggestions. Gotta go faster than 110MPH though.

Thanks for the input!

Dave
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Old 09-18-2006, 10:33 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

There are "reports" of the guy(s)? Who run OS-77VRDF or 91VRDF engines in their Dago's and hit VERY high numbers...

Cheers!
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Old 09-19-2006, 03:26 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

Hi,

I am the "other r-c-guy" that Mr. Cyclic hardover is maligning with regularity even though we have used 2 means of documenting our speed. We we cannot do 1000 mph nor have we claimed to do 1000 mph as he states. We do not even claim our numbers in straight and level flight!

Many thanks to other members who have supported our efforts, but I guess he simply will not believe what he has not seen.

We have a modified DagoRed/VooDoo type P-51 Mustang using a modified OS 91 vrdf with full wave pipe turning an 11-10 apc prop. Modifications included streamlining and altering dimensions for less drag, smooth cowl, very sharp type of tru-turn spinner, enclose pipe, wheel pants, fillets.......

We then purchased an Eagletree Data system with both the pitot and GPS module to determine speed since many people stated that the pitot system was prone to inaccuracies which it can be. The GPS module is much less prone to inaccuracies but is also more costly to purchase. However, its results are much less prone to error.

While I do have to come out of a steep 400 ft or so dive and then level to a 10 degree dive for the engine and plane to fully accelerate, the Eagletree data system has recorded speeds over 170mph. Again, to eliminate some possible errors and at the request of some rc-universe members for additional confirmation, this speed was confirmed by the Both the gps module in addition to the pitot tube recording simultaneously.....

I won't repeat of the trials in the other thread, here, but see the thread for details.....

http://www.rcuniverse.com/forum/m_4517633/tm.htm

We have done it and are making more modifications to increase speed further. I do not believe we will get too much more increase though without a smaller airframe and/or bigger engine.

To do this with a four-stroker, I believe a high pitch prop will be needed. The unlimited guys in giant scale are hitting the mid 200's with regularity. There are some good articles on improving speed at their web-site: http://www.usrainfo.org/
This is where I got a number of my ideas.

randy



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Old 09-19-2006, 05:04 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?


ORIGINAL: r-c-guy

Hi,

I am the "other r-c-guy" that Mr. Cyclic hardover is maligning with regularity even though we have used 2 means of documenting our speed. We we cannot do 1000 mph nor have we claimed to do 1000 mph as he states. We do not even claim our numbers in straight and level flight!

Many thanks to other members who have supported our efforts, but I guess he simply will not believe what he has not seen.

We have a modified DagoRed/VooDoo type P-51 Mustang using a modified OS 91 vrdf with full wave pipe turning an 11-10 apc prop. Modifications included streamlining and altering dimensions for less drag, smooth cowl, very sharp type of tru-turn spinner, enclose pipe, wheel pants, fillets.......

We then purchased an Eagletree Data system with both the pitot and GPS module to determine speed since many people stated that the pitot system was prone to inaccuracies which it can be. The GPS module is much less prone to inaccuracies but is also more costly to purchase. However, its results are much less prone to error.

While I do have to come out of a steep 400 ft or so dive and then level to a 10 degree dive for the engine and plane to fully accelerate, the Eagletree data system has recorded speeds over 170mph. Again, to eliminate some possible errors and at the request of some rc-universe members for additional confirmation, this speed was confirmed by the Both the gps module in addition to the pitot tube recording simultaneously.....

I won't repeat of the trials in the other thread, here, but see the thread for details.....

http://www.rcuniverse.com/forum/m_4517633/tm.htm

We have done it and are making more modifications to increase speed further. I do not believe we will get too much more increase though without a smaller airframe and/or bigger engine.

To do this with a four-stroker, I believe a high pitch prop will be needed. The unlimited guys in giant scale are hitting the mid 200's with regularity. There are some good articles on improving speed at their web-site: http://www.usrainfo.org/
This is where I got a number of my ideas.

randy



All this with a 4 stroke??????
Have we lost track of the thread topic???

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Old 09-19-2006, 07:38 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

Sorry,

I got off track.....
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Old 09-19-2006, 10:00 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

ORIGINAL: rcguy!


All this with a 4 stroke??????
Have we lost track of the thread topic???

Dave
Maybe the thread topic should change to - Here is an almost impossible task and I wont compromise so hand me the golden egg.

150 mph ARF with a 4 stroke and big wheels for grass. Time for a reality check here. This would require a lot of ambition. Not sure I see that.
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Old 09-19-2006, 10:43 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

Arf Viper Q-500 with YS 63 4 stroke and the right small dia. high pitch prop just might get you close to your goal.
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Old 09-19-2006, 02:22 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

Q-500 and YS-63? Fun combo but 150?? I doubt it...

Those Midget Mustangs, Little Toni's, Rare Bears etc. are probably pretty fast....

Mr Conner hit it on the head already...

Do you guys have a pitch/prop speed calculator? I have always wanted to play with one... Link maybe?

Cheers!
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Old 09-19-2006, 04:13 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?


ORIGINAL: Razor-RCU


Do you guys have a pitch/prop speed calculator? I have always wanted to play with one... Link maybe?

Cheers!
http://www.bmaps.net/
ThrustHP calculator is under goodies on the left.
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Old 09-19-2006, 07:29 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

apc 16-16 cut down (12" range?) to spin 10k would get you in the ballpark.... YS110 on a Quickie airframe? need a much longer tail, perhaps another 30" on the back

I have read about folks doubling up the valve springs to get more rpm (like the os 26 car engine) without valve float.... wonder what a ys63 will spin with double springs?
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Old 09-19-2006, 08:17 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

ORIGINAL: r-c-guy
Hi,
but I guess he simply will not believe what he has not seen.

Oh I believe in God, Toothfairy, Santa Clause and the Easter Bunny because i have recieved good advice, some money under the pillow,neat presents and quite a bit of egg candy but i don't having any problem telling the "emperors" that they are not wearing any clothes.

Oh yeh, lets not forget the ever faithful "laundry fairy."
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Old 09-19-2006, 10:14 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

I HAVE FLOWN A BALSA USA NORTH STAR AT 125 mph (OUT OF A DIVE) CLOCKED ON RADAR with a Os 91 4 cycle and a 12x 11 apc prop max rpm on the 91 is 12000 and I am sure I was near it. I flew it for many years without any problems. I am sure that with the right prop (apc 11x12 or 13x13 cut down to 11 or 12 inches and the right plane like a Great Planes Patriot XL (its not a arf) I would bet you would be close.
We were at the neat fair this past weekend and and there was a yak 11 reno racer electric that was clocked at 157 mph and 120 mph straight up it belonged to Keith shaw and was the most impressive plane there
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Old 09-21-2006, 10:26 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

I have a Dago Red with a YS .91 running on 20%....

....it will hit a buck 10, maybe 15 on a good day. 150 is out of the question,
the plane is too fat.

FBD.
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Old 09-21-2006, 10:48 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

I have a nib YS .91 that I would love to put on a plane and go 150 mph. When I find one, I'll use it, untill then its sitting on the shelf looking pretty in its red box gathering dust (its been there a few years).

I would love for there to be a plane (ARF) out there to complete this task, or even get close, but there is not. You almost need to design a purpose built speed plane around it like they do for the speed cup. Now that sounds like a fun idea
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Old 09-21-2006, 11:04 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

I have a NIB 1.20 YS FZ for the Tsunami....I have been patiently waiting
for Michael to get a production run going for a couple years now.

I think with enough nitro, and the right prop, it might push a buck and a half,

....downhill.
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Old 09-21-2006, 01:09 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

Hey Flyboy, I have one of those kits

I was originally going to put the .91 on it, but thought I would be dissapointed with its performance.
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Old 09-21-2006, 01:20 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

Yep....I think the 1.20 would be more like it, 33% more power.

....maybe like a 12-14 prop on 30%....[sm=thumbup.gif]
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Old 09-21-2006, 04:14 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

Yup! Flyboy Dave had a lapse in judgement and let me fly the Dago, it is a perfect combo with the YS-91 and is pretty quick! As he said 150 is just not reasonable....

The Tsunami is sweet! I have a YS-140FZ [X(]
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Old 09-21-2006, 05:55 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

I found the combo. to make this a reality! (could not stay 1.00 or < however)

Just today I made the deal that will solve this conundrum!

I got the plane- and the engine! Just need to get them together... I DO need a Hyde soft mount that'll fit this ship though!

Magnum R
YS-140FZ
13x13 Rev-Up prop.



Made you guys look!
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Old 09-21-2006, 09:19 PM
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Default RE: 150MPH 4 cycle airplane/engine combo?

I can't wait to see this.
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Old 09-22-2006, 11:10 AM
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Default RE: 150MPH 4 cycle airplane/engine combo?

....I hope he doesn't mount it inverted....

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