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

Magnum R 200mph?

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Old 09-08-2006, 12:20 PM
  #1  
SSGSPEEDMAN
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Default Magnum R 200mph?

I was wanting to know if the mag R can hit 200mph with a nelson Q40?

Kevin
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Old 09-08-2006, 01:19 PM
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diggs_74
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Default RE: Magnum R 200mph?

Honestly Kevin I would doubt it.. A Q40 is much more streamlined than the MagnumR and don't hit 200, well not in race trim anyway. That's just my .02 worth..
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Old 09-08-2006, 04:55 PM
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Default RE: Magnum R 200mph?

Nope, lucky to hit 165 or so. People don't realise how hard it is to truely do 200mph. And costly.
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Old 09-08-2006, 06:06 PM
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Default RE: Magnum R 200mph?

Well to tell you the truth I had the regular Magnum model and it was with a mag .46 , performance spec. pipe, and APC 8X10 clock 165mph with my rador gun several times in straight flight no wind.

Well if the f3d nelson was on there would it hit 200mph then?
if not would the MB 40 hit 200mph?
Kevin
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Old 09-08-2006, 07:36 PM
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Default RE: Magnum R 200mph?

If you got 165 on your engine/pipe/prop combination, it would take 80% more power to do 200.
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Old 09-08-2006, 08:00 PM
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Default RE: Magnum R 200mph?

Well..... anyone have any ideas?

KEvin
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Old 09-08-2006, 10:57 PM
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Default RE: Magnum R 200mph?

The idea is that it is a waste of time and money to try to get a Magnum to do more than it was designed for.... It is a blistering fast ARF, and that's where it ends. No matter how much power (money) you throw at it, it will never be a "true" speed plane.

In other words, there are easier ways to get to 200...

IMHO the top F3D engines you have in mind are not suited for the Magnum: the airframe can't take the strain for starters, and their efficiency point does not agree with a plane like the Magum.
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Old 09-09-2006, 09:03 AM
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Default RE: Magnum R 200mph?

Like I said, lucky to hit 165. You will never get a magnum to 200mph. Your radar gun needs calibrating too unless you were doing something more than a stock Magnum .46 on a pipe. Even with 40% it's not going to see that speed. What elevation, time of year, prop, fuel and what rpms did you get on the ground before that 165mph pass?
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Old 09-09-2006, 10:53 AM
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Default RE: Magnum R 200mph?


ORIGINAL: SSGSPEEDMAN

Well to tell you the truth I had the regular Magnum model and it was with a mag .46 , performance spec. pipe, and APC 8X10 clock 165mph with my rador gun several times in straight flight no wind.
Kevin

My West 50 (17,400 RPMs on a 9x7) equipped Magnum would probably do 150 max coming out of a dive, so I'm defintely wondering about that 165 figure. A Magnum .46 is not exactly an high performance engine, so I'm thinking you might have some multipath reflections coming from your prop or tuning issues with the radar gun.

I bought into the 200 MPH Weston advertising also. If there is an engine that could get that plane to 200 MPH, I would certainly like to see it. I mean if an incredibly sleek QM-40 plane is just hitting 190-200 MPH on a dive, do you really think the draggy Magnum is going to do 200?

I would love to see how a Nelson Q-40 or FAI, or a MB Profi would do on a Magnum though

What kind of speeds do you guys think it could get up to?
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Old 09-09-2006, 12:49 PM
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Mike Connor
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Default RE: Magnum R 200mph?


ORIGINAL: cobratraxxas69

I would love to see how a Nelson Q-40 or FAI, or a MB Profi would do on a Magnum though

What kind of speeds do you guys think it could get up to?
Probably a little better then having that engine bolted to a work bench. I suspect not enough prop for that airframe so it may be slower then a SJ-50 or West. Not really sure but it would be interesting if someone would try it.
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Old 09-09-2006, 06:16 PM
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Default RE: Magnum R 200mph?

Well im suprised that people aren't using the mag plane to hit 200mph, with that one guy using the GRRT 40. on the mag.
With all the mods I've seen ppl do on the mag why shouldn't it hit 200mph?

i mean the kind of fast im looking for is this fast.
except on a .40 size plane
http://www.youtube.com/watch?v=rT-DtoKyYS4

where can I get some of them Germin racing planes.
http://translate.google.com/translat...l%3Den%26lr%3D

Where can I buy those planes?

Kevin
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Old 09-11-2006, 10:59 AM
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Default RE: Magnum R 200mph?

Fastest magnum I know of to date is powered by a Jett SJ-60LX, 8.8x9.25 prop clipped to 8.25" diameter.

I do not quote speed numbers provided unless there is some verification, and in this case there is not.

However I can tell you it is most likely flying below 200 mph.

As noted, the Magnum is a quick plane - but it is a larger airframe - needs some prop area. A 7.5" diameter Q-40 or F3D prop is not going to cut it.
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Old 09-11-2006, 08:30 PM
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Default RE: Magnum R 200mph?

Hi Guys,

I just posted a video of my Magnum on the new rcuvideos.com website that rcuniverse.com just put up.
My Magnum is powered by a Jett .50 AAC, with the Super Sport muffler and APC 8.75x9W prop. I used
the WaveOsScope software on the audio portion of the video (recorded a .wav file during mpeg playback
using the Soundblaster Audigy 2 ZS in my PC). WaveOsScope puts my Magnum at 151 mph. Here is the
link to the video:

http://www.rcuvideos.com/view_video....7b62254211691b

My Jett .50 is still very new, and kept slightly (but not a whole lot ) rich, since it is still breaking in.
You can definitely see a significant smoke trail behind it, so there is more power to be had. Since
shooting this video, I have added a bubbleless tank as well, that is a very worthwhile improvement.
Still, I don't see the Magnum reaching 200 mph in anything less than a vertical terminal dive...

Electric Delta
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Old 09-11-2006, 08:41 PM
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Default RE: Magnum R 200mph?

My West 50 (17,400 RPMs on a 9x7) equipped Magnum would probably do 150 max coming out of a dive
7 inches pitch running at 17,400 rpm gives a theoretical (that is, with no slippage whatsoever) speed of just over 115 mph, so, your guess of 150 coming out of a dive is probably quite accurate.

FWIW, I agree with you when you say that 165 mph is probably not possible with this set-up.

-David C.
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Old 09-11-2006, 09:56 PM
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Default RE: Magnum R 200mph?

Electric Delta:

Awesome video!!! Man you fly close to the ground. Your plane seems a bit faster than my West .50 Magnum.
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Old 09-11-2006, 10:49 PM
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Default RE: Magnum R 200mph?

Here's the 2 best passes from my Magnum (West .50)-- one with a 9x7 prop and a 8x9 prop


http://www.resume-connection.com/9x7BestPass.mpg


http://www.resume-connection.com/8x9BestPass.mpg

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Old 09-12-2006, 11:51 AM
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Default RE: Magnum R 200mph?

Very nice..
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Old 09-16-2006, 01:36 AM
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Default RE: Magnum R 200mph?

I think it's the fastest mag I have seen too. Congrats Eleectric Delta [sm=thumbup.gif]

Bob, do you think using this SuperSport muffler would imrpoves things a lot compared to the stock muffler I have ?
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Old 09-16-2006, 08:17 AM
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Default RE: Magnum R 200mph?

on smaller racing props the SS can help if the airframe and prop will allow the engine to really unload in the air. But for most fast 'sport' stuff use a heavier 10x6, 10.5x6, 9x8, 9x9 or 8.75x9 and you will be better off with the longer muffler.
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Old 09-16-2006, 04:14 PM
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Default RE: Magnum R 200mph?

ok thx [sm=thumbup.gif]
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Old 09-16-2006, 04:42 PM
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Default RE: Magnum R 200mph?

150-165 would make me a happy camper for a little arf like that... I am trying to make a trade with Airgar for the Mag/West-50 combo. for the Revver's get together---

1. Cobra you coming?
2. Cobra wanna help me with the Mag providing I get it? No 8x8 is it because the hand launch is dicey on 8" ? My Jett-50 turns a 9x8 APC 17.2 the West is best on 8" isn't it?

Cheers!
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Old 09-16-2006, 09:06 PM
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Default RE: Magnum R 200mph?

ORIGINAL: Razor-RCU

150-165 would make me a happy camper for a little arf like that... I am trying to make a trade with Airgar for the Mag/West-50 combo. for the Revver's get together---

1. Cobra you coming?
2. Cobra wanna help me with the Mag providing I get it? No 8x8 is it because the hand launch is dicey on 8" ? My Jett-50 turns a 9x8 APC 17.2 the West is best on 8" isn't it?

Cheers!

Hey Razor,

I defintely should be coming (is that an oxymoron)??

My West .50 is turning 17.8 to 17.9 on a 9x7.....I wonder what your Jett .50 would turn on a 9x7....I've always wondered which was the faster engine, as they seem to be such natural rivals for the .50 Sport engine crown.

I will help you with your Magnum (assuming you get it). A hand launch on a 9x7 is Easy Squeezey. A hand launch on a 8x10 is a 50/50. A hand launch on a 8x9 is an 85/15 (success to failure).

I haven't tried an 8x8 yet, but I want to....the 8x8 has been the overall best prop for my Diamond Dusts...

After my Magnum crashed (dead sticked after putting a video camera on it), it seems slower now after the rebuild. I know it's not the engine as it's turning the same RPM. The worst part of all....I didn't get any video after an awesome flight (the darn thing reset)...

But one thing is for certain, putting the video camera on the Magnum made it go faster. I'm not sure if its because it's heavier now, or because it had a more forward CG??
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Old 09-16-2006, 10:41 PM
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Default RE: Magnum R 200mph?

I never tried the APC 9x7 on my Jett .50, and frankly I would be scared to, as that might well exceed the rated safe RPM
limit of the prop. For speed, the Jett is probably better with a D1-Hub Q500 pylon prop (what I use), they are made to take
the RPM; if you want pulling power, a 10x6 is good. So far my success rate of launching the Magnum is nearly 100%
with the APC 8.75x9W; the one time it didn't work was the next flight after a hard landing had flung the clunk up into the
front of the tank, causing the engine to quit as it left my buddy's hand. Can't blame the prop choice for that. I'll admit, it's
always a little wobbly the first 10-15 feet or so, but after that, the handling is absolutely solid. I've had a number of
people, who've never hand-launched a power plane, launch my Magnum without a real problem (even some pretty wild /
bad throws).
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Old 09-16-2006, 11:14 PM
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Default RE: Magnum R 200mph?

Cool! I would probably start with a 9x7 for launch and getting it trimmed, then try the others (quickly thereafter).

Cool videos guys! I am excited about the Revvers II or IV or whatever it is-

Watch out for Speed Junkie as he is locked in his basement making some Revver special for next month
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