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

Thinking of a Limit Q 500 and a .61 DF.

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Old 04-09-2008, 12:15 AM
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Mudball3
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Default Thinking of a Limit Q 500 and a .61 DF.

I am thinking of building a Limit Q500 and mating it with a rossi 61 df engine. All I need to do now is find the right prop for that engine. Any help on that issue would be greatly appreciated. I was thinking maybe a 9x8 cf. let me know how far off i am.

Here is the link to that Limit Q 500 http://www.pylonworld.com/rc_pylon/q...imit_q-500.htm

Thanks for your help.
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Old 04-09-2008, 01:45 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

A Q500 is a very small plane for a Rossi 61. Heavy engine that is rear intake. That would put the engine much forward of where it should be along with the prop about 2 1/2" forward as well. Balance would be an issue.

How about a Jett 60lx...its a 40 size engine that will fit on a Q500 and will turn some serious revs with small props on the black pipe?

Richard
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Old 04-09-2008, 02:04 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

I would really like to put this engine to use it has just been sitting around gathering dust. Is there any other airframes that would work with this engine.

Thanks much.

It doesnt have to be a q 500 airplane but I also dont want to sped a lot of money if that is at all possible.
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Old 04-09-2008, 02:06 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

I just want it to go really fast. Any suggestions on what kind of prop i should use

Thanks
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Old 04-09-2008, 07:12 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.


ORIGINAL: Mudball3

I just want it to go really fast. Any suggestions on what kind of prop i should use

Thanks
8.2-10 CF speed prop or 9-10 APC perhaps? Perhaps a clipped 10-10 might be better in terms of hub strength. But a "big block" on the nose of a Q500? Doesn't worry me horsepower-wise but in terms of weight and balance. Perhaps if you lop a couple of inches off the nose. With the extra induced drag and balance issues, I wonder if it will go faster than a QM40 or 50/60LX small-block powered example. Hey, I guess someone ought to try it!

MJD
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Old 04-09-2008, 07:19 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

ORIGINAL: MJD


8.2-10 CF speed prop or 9-10 APC perhaps? Perhaps a clipped 10-10 might be better in terms of hub strength.But a "big block" on the nose of a Q500? Doesn't worry me horsepower-wise but in terms of weight and balance. Perhaps if you lop a couple of inches off the nose. With the extra induced drag and balance issues, I wonder if it will go faster than a QM40 or 50/60LX small-block powered example. Hey, I guess someone ought to try it!

MJD
Dead on right, all of it!
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Old 04-09-2008, 09:03 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

If this engine is a runner, those high pitched APC sport props can let loose, even below the recommended 190,000/diameter formula. I would not try this project with a cheap ARF. One little hidden flaw in the ARF Q500 and you will need a shovel to retrieve whatever is left. The big Rossi would have you hacking into the plane and moving things around to get the CG and to get everything else that got moved back happy again. The higher quality reenforced Q-500 wings that are set up for the 160mph class would be the way to go, then just build your own fuselage
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Old 04-09-2008, 10:34 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

ORIGINAL: Mudball3

I would really like to put this engine to use it has just been sitting around gathering dust. Is there any other airframes that would work with this engine.

Thanks much.

It doesnt have to be a q 500 airplane but I also dont want to sped a lot of money if that is at all possible.
Go to www.MatneyModels.com .... look up the Zoomer on the q-500 page.

This design may better accomodate the engine.

Basic kit is fiberglass and foam. Inexpensive, and affords flexibility.

Fiberglass fuselage.... you can position the firewall further aft when you build it. You will have to come up with a sturdy aluminum beam mount or build a wood mount (Id probably go the wood route, look how the Cermark F-16 mount is done). You can probably build a cowl/cover to keep most of the resulting engine opening enclosed. Pipe could be run down the side of the fuselage.

Keeps in the speed-spirit you are looking for, good flying plane, and will tolerate coming in a bit heavy with the extra engine up front.

Just a suggestion

The Rossi .61 fan engine was just a high timed pattern engine.
I'd suggest trying the 8.8x9.25 Q-500 prop. Should be about the right load.... no issues up over 20K rpm if it gets there.

Bob
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Old 04-09-2008, 11:50 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Thanks for the info guys. Were can I get this 8.8x9.25 Q 500 prop.

I like the looks of that zoomer. Do you now how it builds fairly easy or hard.

Thanks much.
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Old 04-09-2008, 01:37 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Zoomer build thread.
http://www.rcuniverse.com/forum/m_64...tm.htm#6499138
Prop is an APC.
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Old 04-09-2008, 03:41 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Hi I called Apc and talked with the tech guy and he said that the only prop that he would use was the 7.4x7.81C Q40 carbon.
He said that the larger 8.8x9.25 was going to be to big and that the engine would not be able to reach operating rpms.

What do you guys think. I dont know much so your advice is greatly appreciated. Will this prop make my engine over rev?
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Old 04-09-2008, 04:33 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Fred knows his props out there.

Id start with the 8.8" diameter prop. 8.8x8.5 up through 9.25. Find the one that gets the engine up to 20K rpm. The Rossi .61 an .81 both ran great at lower rpm in Byron fans. So they were happy in the 16,000-18,000 rpm range. Just set the pipe accordingly.

Consider a Jett .40 q-500 engine will turn an 8.8x9 prop upwards of 20K+ in flight (appx) the rossi .61 would be happy doing it too.

Id use the 7.4 prop on a .45 size fan engine, definately. The .61 has better power and more torque.
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Old 04-09-2008, 05:00 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Ok thanks for the help and info bob.
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Old 04-09-2008, 06:55 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

The 8.8 and 8.75 diameter pylon props should be safe to 25500 max (air or ground) and I tend to stay away from N or NN (narrow) props, they seem to slip too much for me.
Betcha that Rossi 61 DF will like the new 8.8 X 9.25 at about 19500 when the pipe is set right.
on sale too:
http://www.pspec.com/details.asp?ProdID=47&category=6
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Old 04-09-2008, 08:29 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Thanks for the info freakingfast. i orders some of the props 8.8x9.25. I have a tuned pipe but it is for a .65 to.91 size engine. Will this be to big if so what brand makes a good tuned pipe. The only one that I have ever really heard of is Macs.

Thanks
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Old 04-09-2008, 09:07 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

That pipe may work just fine. Some DF engines run one size up from normal. Try it.
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Old 04-09-2008, 09:10 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

I have been told different things when it comes to DF engines and I was wondering what % of nitro to run in this engine. I have been told that this rossi engine runs best on 5%. What do you guys think?
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Old 04-09-2008, 09:25 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Do your testing on a stand, it's easier to work on and see what your doing. Fancy or blocks of wood, it all works.
Stay behind the prop arc.
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Old 04-09-2008, 09:41 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

That's a safe % to start with. I think 10% is the max with this engine.
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Old 04-09-2008, 11:30 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Does anyone have any suggestion on were i could go or info on how to correctly adjust a tune pipe. I now that adjusting the overal length of the pipe in relation with the header and engine is the basic idea but from there i dont now much.

Thanks
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Old 04-09-2008, 11:43 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

http://www.macspro.com/tuning.asp
http://www.macspro.com/pressure.asp
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Old 04-09-2008, 11:47 PM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Thank you very much.
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Old 04-10-2008, 01:23 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

I had noticed that some of you had said that you cant find a dominator kit any were. I found a web site that still has them.

http://www.roguerc.com/product.php?p...&cat=14&page=1
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Old 04-11-2008, 11:03 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Does anyone know were i can get a wood fuselage and foam wing q 500 kit? Thanks
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Old 04-11-2008, 11:36 AM
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Default RE: Thinking of a Limit Q 500 and a .61 DF.

Check the Pylon Racing forum...you should be able to fine something there...
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