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

YS 45 Prop size suggestion ???

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Old 11-06-2004, 10:07 PM
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Dan_nO
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Default YS 45 Prop size suggestion ???

Hey Guys....im still around, just havent been on the forums as of late, Ive been out flyin I was wondering, I finally got my Polestar flying and got my YS 45 worked out and is running strong now.....NOW its time to figure out what prop/props to try . Im running a stock MAS right now....10-6....its turning 19,200 on the ground......engine does have header and pipe on it. So what props would any of you suggest for me to try now to get the REAL speed out of this puppy ! I guess you all would suggest APC props ? What size ?
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Old 11-07-2004, 11:08 AM
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Default RE: YS 45 Prop size suggestion ???

If its turning a 10x6 at 19K rpm..... I wouldnt change a friggin thing! (maybe try the APC 10x6 and/or wear some safety glasses).
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Old 11-07-2004, 01:14 PM
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Default RE: YS 45 Prop size suggestion ???

I'd love to know what you're doing to get 19,200 on a 10*6. I have the YS 45 RE and I'm getting 15,400 on a 9*8 on 20/20 fuel. Perhaps I have some more tuning to do on my pipe, but would that get me nearly 4K more RPMs? What % fuel are you running?
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Old 11-07-2004, 04:12 PM
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HavinFun
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Default RE: YS 45 Prop size suggestion ???

Here's what I'm getting on my YS45SE/Macs tuned pipe.

Powermaster YS 20/20 fuel
OS#8 glowplug
APC 9x9 prop
16,200 rpm static

On the apc 9x8 I was able to peak it at 17,000 rpm
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Old 11-07-2004, 07:41 PM
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Default RE: YS 45 Prop size suggestion ???

Danno- Good to see ya in here! (We are working on Revvers Bros. t-shirts ans stuff- )

The MA in my experience give higher numbers compared to APC I guess because they are thinner... Having said that, 19K is AMAZING on any 10x6 [X(] Once again I can't remember what that plane looks like but for speed try a 9x8 or 9x9- I would say 9x7 but..... I always ran a 10x7 on 10x8 on my YS-45SE because it was in a CBM F-16N, and it needed some diameter-

Robert- Looks like you have something going on with your YS, my YS-45 on a stock muffler (waste of time-compared to the Macs tuned-pipe) was at 15.1K with same 20/20, APC 9x8, OS-8, 75 Deg. 1,500 ASL...
Have you messed with the header/pipe? If not, there are some really great threads on exactly how to do that! (I say cut 1/4 inch off the header until you quit gaining rpm's then stop there [X(])

Havinfun is always pretty dialed in and his numbers look right to me--- 17K on a 9x8 is NOT easy for a sport engine!

My stock Webra-50GT hit 16.2K on 5% and some old idlebar plug, 9x8 APC, need to try a Jettstream muffler on there!

Take care guys-
James
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Old 11-08-2004, 02:17 AM
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Default RE: YS 45 Prop size suggestion ???

I'd try the 9-7 MAS, or the Zinger.
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Old 11-08-2004, 08:12 AM
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Default RE: YS 45 Prop size suggestion ???

Hi,
19200rpm on a 10x6 is a very good figures.
Try a high pitch propeller instead like APC 9x10, 9x9, 8x10 for good speed after takeoff. Master Airscrew makes noise & works not good at high rpms and there is a very big risk one off your blades will come off soon.
Good luck, Amir
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Old 11-08-2004, 10:14 AM
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Default RE: YS 45 Prop size suggestion ???

Bob, Robert, Havin Fun, Razor, Dave, Flyer 95.....thanks for all of your replies guys.

Bob, yes, Im turning a Master Airscrew 10/6 at 19,200.....I know on the YS 45 it says that 2 to 18 is the practical. Doesnt mean that its not capable of turning more though huh ? Yea it may shorten the life of it....but what do us speed boys want, to get all that we can LOL. Yea i often wonder about it slinging a blade, and we have always been really careful in keeping it pointed in a safe direction when starting and messing with it when its running. Yes it seems that the APC props do do a better job, we have played with changing to some APC props on some other planes we have and you most certainly can tell a difference !!!

Robert, my YS 45 is a side exhaust, it has a Hatori header and a Mac pipe. And i have cut a bit off of the header. Running it wide open and sliding the pipe back and forth to get the peak RPMs on it when on the ground. I didnt know that 19,200 would seem or sound so unreasonable or not be possible, while we were running it my buddy had his tach set behind the prop as he was sliding the pipe back and forth, and when we got to where the max RPMs were that is where we mounted the pipe. We did have to cut a little more off of the header the second time because when he was sliding the pipe forward it was hitting the header, so we cut the header off another 1/4 of an inch and it didnt take but about an 1/8 that time to get it to where it was at the peak, it was amazing to see the difference when we got close just how little it took to change the RPMs. Im using Wildcat Helimix, 15% nitro, 18% synthetic oil. Its pretty neat, I go directly to Wildcat and pick up my fuel, they are only about 40 miles from where i live, they are some really great guys there at Wildcat, Jerry took me in and showed me the botteling line and stuff, it was pretty neat to see the setup and to get to see what all goes on in the botteling the fuel. As to the RPMs im getting, I dont understand....I know that when i have been at the field before and some guys would have the same engines running the same fuel ect ect that there would be a difference in the RPMS and some couldnt get as much as what another guy could. HavinFun is getting a bit more out of his that what you are and he is running everything that you are except for he is running a bit more prop that you are and he is still getting more.

HavinFun, maybe your in the ballpark more of what im looking for....to run a smaller prop size with more blade pitch.....sure its loaded up on the ground, but once in the air it would unload and possibly turn that high RPM with more pitch....which means more speed possibly

Heya Razor.....yea i seen the deal about the T-shirts when i logged back on the other day....waiting to see some logo designs to see what the shirts will look like. As to the props, my buddy tried an APC prop the other day, dropping in diameter one size and going up in pitch....yes you could tell a little difference by the sound when on the ground, but when in the air it sounded about the same and the speed he gained was very noticable !!! From what I have seen, and Ive not played with the different brands of props much at all, it seems like the APCs are the deal.....soooo, guess im gonna be getting some different sizes in the APC in the range of what you all suggested and go from there.

Razor.....there are PICS of the plane i have that you dont remember in my profile thingy that i posted.....its a bit squirly LOL.

Flyboy.......how ya doin Dave !!! Im fine....as you can see, Im messing around trying to get tuned in

Flyer95.....thanks for the suggestions.....ill get some of those and try em

Thank all of you guys for responding and your suggestions.......keep us posted as to the T-shirts and what they are going to look like.
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Old 12-05-2004, 06:06 AM
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Default RE: YS 45 Prop size suggestion ???

Dan,

What is the polestar ? A plan / kit ?

thx
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Old 12-05-2004, 09:14 AM
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Default RE: YS 45 Prop size suggestion ???

Hey , its a plan.....its designed by Bill Evans, he is in California. Its a bit on the squirley side with a 34 inch wing....it isnt relaxing to fly it at all, its actually nerve racking !
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Old 12-05-2004, 09:25 AM
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Default RE: YS 45 Prop size suggestion ???

Thanks Dan !

I want to get this plan...Do you know how I can get in touch with him ? Any plan reseller ?
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Old 12-05-2004, 10:01 AM
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Default RE: YS 45 Prop size suggestion ???

Ill look around and try to find his phone number.....ill post it back here.
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Old 12-05-2004, 04:00 PM
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Default RE: YS 45 Prop size suggestion ???

Dan_nO....

....do me a favor, and do a direct comparison between the 10-6 MAS, and the
10-6 APC for RPM....I think you will be in for a suprise....[X(]

FBD.
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Old 12-05-2004, 05:15 PM
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Default RE: YS 45 Prop size suggestion ???

A surprise as to me going with an APC ? Have already compared the MAS to an APC on a K&B 3.5 and there was NO comparison......needless to say that the APC STAYED !!!
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Old 12-05-2004, 05:35 PM
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Default RE: YS 45 Prop size suggestion ???

See what happens to your RPM with the APC 10-6 on the .45

Dave.
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Old 12-05-2004, 05:48 PM
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Default RE: YS 45 Prop size suggestion ???

from what we seen the rpms dropped on the ground, but increased in the air
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Old 12-06-2004, 06:49 PM
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Default RE: YS 45 Prop size suggestion ???

Strykaas......this is the email addy that Bill wrote to me from just here recently.....i cant find his phone number, im still looking for it, Ive got a bud that might have it, will get in touch with him and see if he has it written down somewhere......in the mean time, here is Bills Evans email addy....... simitar40@aol.com
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Old 12-07-2004, 05:50 PM
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Default RE: YS 45 Prop size suggestion ???

Thanks a lot Dan, I'll try to get in touch with him.
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Old 12-07-2004, 06:40 PM
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Default RE: YS 45 Prop size suggestion ???

Dan....

....wind that baby up tight like you had it with the MAS 10-6, then put the
APC 10-6 on it, and wind it up again. Same fuel, same pipe, same spinner,
same everything....

....post the results....static maximim RPM with the tach.

Dave.
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Old 12-07-2004, 07:22 PM
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Default RE: YS 45 Prop size suggestion ???

Everybody knows the MA will show higher RPM's but that does not mean you will fly faster--- Those MA props are skinny and they flex, Dave you know that---

I could design a skinny arse prop. that spins amazing RPM's but does not create speed!

Still muddy?
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Old 12-07-2004, 07:53 PM
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Default RE: YS 45 Prop size suggestion ???

James....

....until several yaers ago, all pylon props were toothpick wooden props.
They went plenty fast. MAS props don't flex any more than the others, not
even wood props, they flex too. Now, if you want to see "flexy", check the
tips on an APC....they're like jello. [X(]

No mud yet....after the ice melts it will get muddy. [X(]

FBD.
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Old 12-07-2004, 08:42 PM
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Default RE: YS 45 Prop size suggestion ???

Hey Dave,

If your APC's are flexing like the MAS's, you better quit sanding them. [X(]

Hey James,

We might have to put floats on our "speed" planes....
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Old 12-07-2004, 08:59 PM
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Default RE: YS 45 Prop size suggestion ???

Yo Gary....

....all my APC's are in my tackle box....great for scaling fish. [X(]

Dave.
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