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

I need help

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Old 04-07-2008, 06:21 AM
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funflyerf4
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Default I need help

Yes I know what you are thinking but not me but my plane,I have the smaller Patriot with a Jett 60lx with a 9-8 prop spinning 17,800 on the ground what prop should use for more speed I need to catch up to mark5. the plane was clocked at 135,I neeeeeed mooooore speeeeeeeeeeeeeeed!Maybe a P-70?Ok back to me yea I need some help too acording to my wife.There is a song with the saying,I'm not sick but I an't quite well.
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Old 04-07-2008, 09:09 AM
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Flyboy Dave
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Default RE: I need help

....that is about all you are going to get out of it, that is very good in fact.

FBD.
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Old 04-07-2008, 09:45 AM
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Ed Smith
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For more speed you will have to try different props. Try some of the APC Pylon Racing props. The "40 Pylon sizes" go up to 8.75 x 9.5. There is quite a range of pitches. Check out the prop list on the APC Site. For example the Jett and Nelson .40 size engines are turning the aforementioned prop in excess of 19,000rpm.

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Old 04-07-2008, 09:56 AM
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Yellowsierra02
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Do you have the Gold or Black pipe? I know the black pipe will turn more rpms as long as you stay under a 9" prop. I talked to Dub and he said on a Viper using the 60 lx and a gold pipe you will get around 135 but if you have the black pipe and run a pylon prop you will hit 150!

Justin
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Old 04-07-2008, 09:56 AM
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Mike Connor
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That engine should turn a 9x9 around 18,000 rpm. I would not go down in prop diameter on a Patriot, maybe even go up.
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Old 04-07-2008, 11:00 AM
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Ed Smith
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That is why I said the different props should be tried. For more speed go down in diameter and up in pitch. Within limits of course.

Finding the limits and the prop that does it is a never ending quest.

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Old 04-07-2008, 12:24 PM
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9x9, the Pylon props are typically too small for the Patriot---
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Old 04-07-2008, 01:38 PM
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funflyer4

You are sorta beating a dead horse here. Your getting 135 out of a airframe designed for 75 or so, not bad at all. To get more, its the same old story, time or money. You allready have a engine that is outstanding, proven by the 135! Your alternatives are either be happy with that speed or invest some time and money into a faster airframe. The most rewarding direction is to design and build your own airframe. From full scale drawings to a completed airframe does not reqire rocket science. After your first one, your stuff will improve in design, function and speed. Start with a good wing (just cause its there) off a quickee or formula. Its general design is poven good, yes you may be able to improve it in the future, right now your a student. Use the Q-500 general moments and streemline them. That 175mph bird will be faster. The wing can be cut down to at least 40" span and not effect the turning or landing ability by much and improve top end. One of my recent creations Jett 60LX/black pipe Q-500 wing cut to 40 then 38" was actually faster than I was cumfortable with. If you gotta have 200mph, buy a formula bird and learn to play with props, fule and settings, the speed is there, you just have to find it. One of the best things about a bird like this is that that Jett 60LX will let you dial in what you want until you can fly it safely. Have seen a good number of decent pilots have a tough time adapting to the high speed stuff. Not as easy as it may look, something you need to get used to. Regardless, do your thing and ENJOY.
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Old 04-07-2008, 02:24 PM
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Default RE: I need help

Or....................

Try a 9x9 apc.
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Old 04-07-2008, 04:34 PM
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All the info sounds real good I quess I'll try the 9-9 next.As far building goes I'm the kind of person who hates to build!I just want to fly, fly, and fly some more.Dont get me wrong the plane flyes great and is fast but who we are we allways will need more speedBoy Mark5 had his Patriot out to day and boy it is fast.

Thanks for all the good advise
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Old 04-07-2008, 08:12 PM
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Your getting 135 out of a airframe designed for 75 or so
Please expand on this theory. Or admit it's crap.
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Old 04-07-2008, 08:16 PM
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ORIGINAL: funflyerf4

Yes I know what you are thinking but not me but my plane,I have the smaller Patriot with a Jett 60lx with a 9-8 prop spinning 17,800 on the ground what prop should use for more speed I need to catch up to mark5. the plane was clocked at 135,I neeeeeed mooooore speeeeeeeeeeeeeeed!Maybe a P-70?Ok back to me yea I need some help too acording to my wife.There is a song with the saying,I'm not sick but I an't quite well.

There is a P-70 listed on Ebarf
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Old 04-07-2008, 10:16 PM
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Razor-RCU
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Default RE: I need help

Oh great now we have to hear about Mark5's YS powered patriot.

Is he pulling on you with that set-up?

My Jett-50 loved the 9x9 APC and it was noticeably better and faster than the 9x8, not sure of the 60LX but I would assume it would have an even better chance at the 9x9 or 10x cut down to 9.5x9.

I hate building also, since I suck at it...
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Old 04-07-2008, 10:40 PM
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combatpigg
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It sounds like a good drag race would be between the Rossi .53 and the Webra .50. I've got a Rossi .45 that I bought for 3D many years ago, is there any use for this engine in speed?
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Old 04-07-2008, 10:55 PM
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ORIGINAL: HighPlains

Your getting 135 out of a airframe designed for 75 or so
Please expand on this theory. Or admit it's crap.

I really didn't want to go down that road, glad you did. Like Mike said, stay with the 9 but go up in pitch as you looking for top end here.
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Old 04-07-2008, 11:08 PM
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Get the Weston Magnum ARF and you will lap that Patriot all day long.
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Old 04-07-2008, 11:48 PM
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Combatpigg- In my personal experience and testing the Webra-50GT outperformed the Rossi-53 but I did not test with big props like the Purple Patriot guy is running. I run an APC 9x8 as a baseline since that is typically pretty close to what I run- The Webra is lighter and had a better throttle response. I love both brands dearly but none of them are in the same class as the Jett-50/60LX, or West-50. My new toy is the K&B-7.5CC DF FIRE engine and that should be something....

Mark5 sounds like he has an awesome combination with the YS-60 in his Patriot also- I guess it just depends on what airframe you are thinking of using when comparing these things...

Super-Dave had a Rossi-45 piped and set-up real nice in his F-20 but he runs MA props. to it was hard to tell how that might equate to APC numbers.
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Old 04-08-2008, 12:24 AM
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Purple Patriot guy LOL

I just wonder how RPM can move the jett 60 with a 9x10 apc ??? I think it will be a good prop to test
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Old 04-08-2008, 06:17 AM
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ORIGINAL: Razor-RCU

Oh great now we have to hear about Mark5's YS powered patriot.

Is he pulling on you with that set-up?

My Jett-50 loved the 9x9 APC and it was noticeably better and faster than the 9x8, not sure of the 60LX but I would assume it would have an even better chance at the 9x9 or 10x cut down to 9.5x9.

I hate building also, since I suck at it...


I was there when Mark5 clocked his plane at 165 I saw the read out on the radar gun.To see this plane fly is a sight.This plane set up must be a freak or some thing cause it is blistering fast.
The way it flys it looks fast.It is faster than my Bommerang with the P-70 in it.I guess I will just try the prop and let it be what it is.
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Old 04-08-2008, 07:07 AM
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Default RE: I need help

hey funflyerf4, I suppose I really shouldn't bud in here, to many of the guys above know there stuff well, but I'd look at it like this, first whats does your patriot weigh?, secondly with the prop you have , does it unload much in the air?, I know most have advised you to stay with a 9 inch diameter, but playing with the numbers in hp, and IF you get a resonable take off with the current prop...I would really be tempted to try a a 9 x 10 cut down to 8 1/2 x 10, the 60lx should have enough torque in it to handle this..but I'd look at the above questions first

either way hope you get it sorted out
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Old 04-08-2008, 07:57 AM
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cncswiss1
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if you hate building, but want to go fast get the matney zoomer with the speed wing, and some new underwear. it's basically a Q500 that is streamlined.
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Old 04-08-2008, 10:39 AM
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Just something to try after playing with the 9x9 ......

since you have a bunch of time on the engine....

10x6 and 10x7

just use good sense on the needle position on the 10x7... it may not fully stage on the pipe on the ground. One way to do this is to set the ground peak mixture using the 10x6 first, then just switch props.

The patriot is a big, draggy plane. I think it can use the disk area. That is why the YS setup is pulling like that... better balance of prop size and plane drag/size.

Of note, testing the 60LX on the Sundowner was getting into the 130-140 mph range. Sounds like you in that same ballpark with the Patriot.


(If all else fails, try a Rossi 53)
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