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

Weston Magnum Question

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Old 07-17-2003, 10:34 PM
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strong
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Default Weston Magnum Question

I put my westom magnum toghter the other day and have a question for some of the magnum pilots.Is 17000 rpm's with the west 50 engine and a 9/6 prop turning fast enough for first flit launch.....or must it turn faster.
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Old 07-17-2003, 10:59 PM
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Default Weston Magnum Question

I've never tried a 9x6 prop, so I can't tell you how fast the engine should turn it...

But 17000 on that prop is more than enough to fly the Magnum... it should pull right out of your hand...enough to go vertical out of sight...
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Old 07-17-2003, 11:07 PM
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Default Weston Magnum Question

can you slow this plane down enough on first flit to at least trim it or must you fly wide open at all times.
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Old 07-17-2003, 11:25 PM
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Default Weston Magnum Question

magnums can be flown pretty slowly, but are built for speed, trim it at half throttle.
have you flown quick models before?
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Old 07-17-2003, 11:47 PM
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Default Weston Magnum Question

I fly a turbine trainer that dose about 100 mph and a pylon racer that must fly about 120 mph. But I have seen video of this plane and it is very fast.
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Old 07-17-2003, 11:56 PM
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Default Weston Magnum Question

youll be fine then.
i was just making sure you werent a newbie trying to learn to fly on a magnum!!!!!!!!!!!!!!
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Old 07-18-2003, 12:09 AM
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Default Weston Magnum Question

I have lot of flying experience but no hand launch experience I want to get it right the first time. Also how will it bleed off airspeed and land.
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Old 07-18-2003, 12:21 AM
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Default Weston Magnum Question

The 9x6 prop will provide you with plenty of thrust, but still, get someone to launch it for you the first time... at least until the plane is trimmed and you get used to how it handles.

The Magnum slows down pretty fast... compared to a sleek F3D race plane that is... It needs a fair amount of room, but not excessive.

Also, with that big prop it should slow down pretty fast when you pull the engine to idle... and it won't be that fast to start with so it will basically be like any sport plane.

The first thing I do when I fly a new plane is trim it... the second thing is testing the slow flight characteristics... I suggest you do the same thing while there is still enough fuel in the tank to go around once... but then again you know all that since you are flying a turbine trainer...
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Old 07-18-2003, 01:22 AM
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Default Weston Magnum Question

Thank for the info.Yea I know to trim and start to test glide for landing but it's always good to hear this from someone who has been there and done that.
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Old 07-22-2005, 01:02 PM
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Default RE: Weston Magnum Question

I just picked up a used Weston UK Magnum ready to fly and have a few ??? What type or fuel nitro% should I use and what prop? Thanks
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Old 07-22-2005, 01:24 PM
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Default RE: Weston Magnum Question

what engine is on your magnum
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Old 07-22-2005, 01:29 PM
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Default RE: Weston Magnum Question

it has the West 50V1 with pipe
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Old 07-22-2005, 01:35 PM
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Default RE: Weston Magnum Question

I run Prosynth 10 through mine, happy as and it screams on a 8x8-10
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Old 07-22-2005, 01:35 PM
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Default RE: Weston Magnum Question

I just checked Weston's web site...they say 5 to 15 % nitro and a 9/6 or 9/7 prop. The guy I got the plane from was running a 9/6 on 30% nitro. I think that's to much nitro but what do I know. I was thinking a 9/7 and 15%
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Old 07-22-2005, 01:37 PM
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Default RE: Weston Magnum Question

I'll try the 8x8- 10..... thanks
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Old 07-29-2005, 11:01 AM
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Default RE: Weston Magnum Question

30% nitro is too much, unless the compression has been reduced via head shims. The Manufacturer's recommendation is 10-15% nitomethane Prosynth. If you don't have Prosynth use some other good quality synthetic oil fuel, but don't exceed 15% nitro with the engine as is out of the box.

I really don't see any point in the combination of 9-6 prop and 30% nitromethane. It's like trying to go fast in a sports car by adding a turbocharger then driving in 2nd or 3rd gear.. great for climbing hills but not for top speed! The usual recomendations are 9-6 for running in and test flights, then 8-8 to 8-10 for speed. The 8-8 may perform better if the header is cut down a bit, up to 1", leave stock for higher pitch.

Mike D.



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Old 07-29-2005, 11:28 AM
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Default RE: Weston Magnum Question

Hi Mike thanks for the post....I got this plane from a wealthy club member who is a good friend. He said here fly this plane and after you crash it give me my motor and servo back. Of coarse the plane was battle damaged and needs a little detail work . The Magnum was set up with some very heavy servos (hitec 5645's) and was modified for rudder control. I removed these servo;s and went with hitec 5245mg's and returned the rudder to stock. My friend is not the type of guy who reads instructions or breaks in motors or installs head shims so I hope he didn't damage the motor. We fly at 5600 ft altitude here and I think he felt the 30% would help with the loss of power we get at this altitude. I will run 10% and a 8x8 prop. The plane is all fixed now and just needs some touch up in the covering. I will leave the pipe lenth as for now until I see how she fly's................Lou
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Old 07-29-2005, 07:53 PM
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Default RE: Weston Magnum Question

If the engine is still good 15% fuel is plenty, magnum is a fast plane no matter what.I would try the 9x6 prop for easy first launch.Have'nt flew mine in months(chicken I guess)just remember not to use very much aileron movement at all.
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Old 07-29-2005, 08:41 PM
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Default RE: Weston Magnum Question

Thanks Strong....I finished her up this afternoon....was going to go to the field for a test flight but my friend ( launcher ) couldn't make it. I will try again tomorrow. As far as throws go I have no idea (no manual ) I may have to much aileron throw and will turn them down a bit. I mounted a 9x7 apc for first flight.
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Old 07-30-2005, 01:48 AM
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Default RE: Weston Magnum Question

One thing to remember is this engine will work beyond the limits of the 8 and 9" APC standard prop range, so keep safe
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Old 07-30-2005, 11:09 PM
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Default RE: Weston Magnum Question


ORIGINAL: Evil Homer

One thing to remember is this engine will work beyond the limits of the 8 and 9" APC standard prop range, so keep safe
I don't think so... unless you use props with "zero" pitch... you'd have to use an 8x5 or 8x6 or something to overspeed it...
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Old 07-31-2005, 01:53 AM
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Default RE: Weston Magnum Question

Hey Rude, I will take your word for it, I only have one of the v50 and i generally am 9x6 on it, my comment was based on the theoretical maximum of around 17.5K and 20K for the 9" and 8" props respectivly as stated by APC, I do beleive the props unload to more than this once airborne, not sure about static RPM as i have never measured it (neighbours get anoyed before i get the chance)
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Old 07-31-2005, 09:34 AM
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Default RE: Weston Magnum Question

Rpm limits for APC sport prop are 190000/prop diameter in inches... this works out to 23750 and 21111 rpm for 8 and 9 inch props respectively.
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Old 07-31-2005, 12:07 PM
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Default RE: Weston Magnum Question

My mistake, i thought the figure was 160000/length of prop
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Old 08-01-2005, 08:49 AM
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Default RE: Weston Magnum Question

Flew the Magnum for the first time Sunday afternoon....what a rush....after a poor launch and nearly crashing I got the plane trimmed out. I have no idea how fast or what rpm....fastest plane I ever flew....after many high speed passes motor guit and I crash landed off the runway...minor damage...can't wait to fly it again
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