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

Hey I built a Shrike!

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Old 09-18-2005, 12:57 PM
  #1  
nogards
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Default Hey I built a Shrike!

This is my first kit to build. Lanier Shrike .40.

It has a Norvell .40 AX motor and is currently running a 10x7 prop, I am thinking of moving to a 9x7. Any suggestions would be great, I am new to this speed thing.

Runs fast, don't know how fast, but very fast for me. It has about 6 flights on it so far and I am really enjoying the fastness of this thing.

Any tips on prop selection would be nice.

Picture below!
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Old 09-18-2005, 01:04 PM
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Razor-RCU
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Default RE: Hey I built a Shrike!

If you have power in reserve on launch I would try a 9x8 APC - it has similar load on the engine than the 10x7 but more speed

Looks great! Keep us posted...
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Old 09-18-2005, 01:05 PM
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combatpigg
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Default RE: Hey I built a Shrike!

Nice job, NOGARDS![8D] That's a striking trim scheme! Don't know much about the NORVEL .40 except it is light. It is advertised as being fuel efficient. I would expect that you are doing about 75 mph or so with a 10x7. If you put on a 9x6 or 9x7, that would possibly be the best choices and the plane will seem much faster.
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Old 09-18-2005, 01:27 PM
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nogards
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Default RE: Hey I built a Shrike!

According to [link=http://www.rcuniverse.com/forum/m_1569283/anchors_1569283/mpage_1/key_norvell/anchor/tm.htm#1569283]this thread[/link] the 9x7 gives the best RPMs static. But I don't know if that is a better thing or not, I would figure it would be better.

Right now it turns around 12,300-12,800 RPMs static

I am also running 15% Wildcat promix, would it be better to go with full synthetic? or is the 15% WC an ok choice?

Thanks some more
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Old 09-18-2005, 01:42 PM
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Default RE: Hey I built a Shrike!

I just plugged the numbers into the THRUST HP program and a 10x7 APC at 12,800 will go 85 mph and produce 4.6 pounds of thrust. A 9x7 at 14000 will go 92 mph and the thrust drops to 3.6 lbs. I don't know what kind of airframe this program considers while it does its' magic?
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Old 09-18-2005, 02:02 PM
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nogards
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Default RE: Hey I built a Shrike!

are those speed figures for straight and level flight?


thanks
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Old 09-18-2005, 04:01 PM
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Joe Ortiz
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Default RE: Hey I built a Shrike!

Sweet looking plane!!, I like the color scheme.

Joe
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Old 09-18-2005, 04:33 PM
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combatpigg
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Default RE: Hey I built a Shrike!

I think straight and level is the only way they would figure it. No substitute for getting out there and going through a 1/4 mile pass with a stop watch. I compared their thrust figures against a machine that I made to weigh the actual thrust delivered and it was dead on.
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Old 09-18-2005, 07:18 PM
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nogards
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Default RE: Hey I built a Shrike!

I went and flew it again this afternoon. I switched to a 9x7 prop, I think it is a little faster, especially out of a dive, but it makes a high frequency rpm warble sound. Is that the sound of the engine getting to its max revs or is that the prop slipping through the air more than it should? Should I go up to a 9x8?

9x7 still has plenty of pull for easy hand launching.

Also, (not taking into consideration build quality) as an overall kit is the shrike pretty durable to high G turns? This thing will really take some corners at wide-open and I am wondering if it is something that could be kept up or if I should limit them.



Thanks
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Old 09-18-2005, 07:58 PM
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Default RE: Hey I built a Shrike!

Personally, I think you should fly it like you ARE trying to snap it in 2! If it holds up, then it was probably built too heavy. The warble sound..... is the engine, and everything on the engine as tight as you can get it? Check the prop balance, make sure the prop isn't slipping. If you yourself can hear prop cavitation or slippage, then I could use you around here! Maybe the airframe or covering is making some noise ?
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Old 09-18-2005, 08:19 PM
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Default RE: Hey I built a Shrike!

IMO you have to be thinking about using a bigger engine. I don't know what your skill level is but a .50 has to make your shrike fly much better than a .40. GL my .10 is on it's way and I am going with the .25 engine to boot .
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Old 09-18-2005, 08:37 PM
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Default RE: Hey I built a Shrike!

I think your Shrike is slow.[&o] You need a faster airplane.[X(] Something with wheels. I'm tired of hand launching for you.[:'(]

Hey, why did the turbine at the field have retracts, but I still have to throw the stupid Shrike into the air?

Seriously though... I'll give you tree fitty for the Cap. That's tree dolla an' fitty cent.

I think I have a spare .46FX under the work table if you want to spice the Shrike up a little more. Or go get you that red motor at Danielle's. That'd make it move, I reckon!!!

-Wayne
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Old 09-18-2005, 08:43 PM
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N925WB
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Default RE: Hey I built a Shrike!

I got a speed plane that'll eat your Shrike alive...
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Old 09-18-2005, 08:48 PM
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Default RE: Hey I built a Shrike!

Sorry... Wrong photo...

Here's the right one...

You know, I still need to put the new fuel tank in this one. I sure hope I can get that five minutes worth of work done before Oct. 1st!!!

Has anyone mentioned any sources or brands of props to try on the Shrike for more speed? I'm sure there have got to be some exotic props out there that are specifically designed for going sill fast.

-Wayne
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Old 09-19-2005, 09:33 AM
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Default RE: Hey I built a Shrike!


ORIGINAL: nogards

..........I think it is a little faster, especially out of a dive, but it makes a high frequency rpm warble sound. Is that the sound of the engine getting to its max revs or is that the prop slipping through the air more than it should? Should I go up to a 9x8? .........


Thanks
Are you sure you aren't hearing flutter?
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Old 09-19-2005, 10:09 AM
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Default RE: Hey I built a Shrike!

The sound we're hearing could be flutter, but all the gaps are sealed, and there's no indication of flutter based on handling.

I would suspect that the warble sound is more likely from the engine/prop combo, but I'm no expert on such matters. I've definitely heard and experienced flutter before, and I don't believe that's what we're hearing. But I could be wrong.

-Wayne
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Old 09-19-2005, 11:54 AM
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Mike Connor
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Default RE: Hey I built a Shrike!

My Shrike 40 had flutter because of over sanding the leading edge of the aileron. Sealing the aileron helped untill I dropped to a smaller diameter, higher pitch prop (9x8) for speed. I finally used 1/64 ply to cover the gap and the flutter never came back. I used Monokote to attach the ply to the trailing edge of the wing.
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Old 09-19-2005, 04:55 PM
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Default RE: Hey I built a Shrike!

the sound is also really only happening when I am doing high speed dives with power. If I pull the power back during the dive, the airplane is still speeding up but the noise will go away. That is why I don't think it is flutter.
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Old 09-22-2005, 09:13 AM
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Default RE: Hey I built a Shrike!

my shrike .10 had a os25fx on a pipe and apc 7.5X7 and it would clear our field at 135 clocked on radar in flat level flight with wildcat 20% heli and a enya #3 plug.
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Old 09-27-2005, 02:47 AM
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Default RE: Hey I built a Shrike!

hey n925wb what kind of plane is that yellow one, and where could i buy one, looks sweet.
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Old 10-02-2005, 04:55 PM
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Default RE: Hey I built a Shrike!

Winston,

That is a Morris Hobbies Yellow Jacket. Mine's got a Norvel .061 Big Mig on the nose, no throttle. I only have a couple of flights on it due to motor problems, and have yet to fully get a feel for it, but it sure looks fast!

-Wayne

Link to the Yellow Jacket: http://morrishobbies.com/product_inf...products_id=69
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Old 11-07-2005, 11:36 PM
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Default RE: Hey I built a Shrike!

Les,

You NEED a new plane!!! The Shrike is fast, but you need something faster!!!

-Wayne
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Old 01-08-2006, 11:24 PM
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Default RE: Hey I built a Shrike!

I've put together a video of nogards' Shrike.

I don't want to post the link directly to this thread, as the video contains mild language and images that may be offensive to some people.

If you'd like to see the video, shoot me an e-mail, and I'll reply with the link. Once you have it, you can do whatever you want with it (except claim it as your own!)

-Wayne
N925WB1@aol.com
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