Hi friends,

I am going to build a Weston Magnum.

I have seen this plane in the air, it was really fast (maybe faster than my DD with Jett Fire 50 and tuned pipe) although it had a standard Webra engine.
For my Magnum I am planning to mount a Nelson engine.
What engine to use. It must have an idle carburetor type.
I am going with 15% nitro and a tuned pipe. ABC preferred.
Yet I do not know if rear exhaust fits the plane.
What engine choice is best? Q40, FAI, Quickie, what are the differences? Thanx for your help.

Second question (I am new to Pylon world!):
Go fast turn left, as it is done in the high speed NASCAR ovals. It is known that the chassis and tire setup of these cars is different right to left.
The pylon planes use a left/right different setup too? Longer wing left, rudder, airfoil……? Sounds logical, or not?

mec

Since no one has replied, I'll take a stab at it.

First off, that's cool model, where can I get one ?

If you want to put a Nelson in it, best to speak to Dave Shadel at Performance Specialties. www.pspec.com The closest engine that will do the job is probably the Nelson Quickie 500 engine fitted with a carb that will idle. Dave sells after-market carbs that will fit on the Nelson to provide some sort of idle. I'm sure he can provide an engine to be competitive with the Jett series. Because the motors are optimized for top speed, the idle will likely be pretty fast. You'll probably have to land dead stick or kill the engine on final approach.

The Q40 and FAI engines are optimized for top end and are not designed to idle. The Q40 and Quickie engines have a side exhaust. The FAI engine is rear exhaust. I don't know why you would want a rear exhaust as it would mean punching the pipe right through the middle of your fuselage. Why not stay with the side exhaust 1/4 wave tuned pipe that is stock with the Quickie engine ?

There has been some experimentation years ago on trying to optimize aircraft design for turning left. The laws of aerodynamics are pretty clear. When it comes right down to it, you want a good clean aircraft that flys well in all attitudes. The secret appears to be in the airfoils. Low drag, low weight, properly trimmed, properly balanced - these are the basics to flying fast whether you're turning left or right. Did I mention pilot skill and years and years of practice along with the mistakes that accompany those years?

cheers,

Randy S.

hi randy,

thanks for your reply.

for better aerodynamics I though it would be better to go with a rear exhaust type engine. I would use a high rise header (similar as I use in my DD with the Jett Fire 50 engine) however had to cut the canopy to fit the exhaust.
exhaust pipe? tuned pipe with muffler, hatori pipe or something similar.
do you know, gives a tuned pipe much more power than the stock muffler delivered with the Quickie?

I sent an email to Dave Shadel a week ago. Unfortunately no answer till now.

mec

forgot to mention:
braeckman sells the plane in europe
www.braeckman.de

mec

I've talked to the magnums designer about the pipe, the ONLY reason it isnt inside the canopy (which has no gear inside it so can hide the pipe) is some people don't know when to stop playing with pipe lenght, so its outside for ease of tinkering.
And thats no standard Webby in there If you saw a Team Weston UK Magnum then it was a little bit better than a production engine

Use the Nelson F3D engine. It is a front intake, Rear exhaust. You could fit a carb to it, whether it will idle is a different discussion. The pipe would exit the fuselage behind the cockpit. It would still be accessible for "length Tinkering"

Above is assumimg that money is no object!

Ed S

The Nelson F3D (F.I.R.E. .40) with Nelson pipe and matching Supertigre 11mm carb ought to work great for this application. I had one on the bench last week, it purrs like a kitten and transitions instantly to a 26,000 rpm howl. Use the Q500 head, 15% nitro fuel, and a carbon fiber 7.25 x 7 F3D prop.

Oh, and make sure all the women and children are safely in the car before you start it up.

I know of a particular Canadian Dentist who has a few Nelson F3D engines and pipes (low time) for sale if any of you speedsters are interested.

contact [email protected]


Randy Smith

POP QUIZ GANG

IS THE MAGNUM ARF KIT CAPABLE OF TAKING THE POWER OF A FIRE 40 ??? Has anyone tried this engine or simmilar on this particular plane !!

Cheers
aziz

current engine is ermmm 2.9 bhp i think, Weston have a 3.1 floating about for demos. has the 40 got that much more? more torque would make the take off a bit more fun, tho you could swap dia for more pitch

Good question. Probably worth a call to the manufacturer. There is the twisting and bending strength of the wing to consider (i.e. center section carrythrough and spar structure) as well as flutter-proofing of the movable surfaces. Basically, it needs to be at least as strong as a typical jet model.

Phillybaby,

I think the Nelson and Jett Q500 engines are rated at about 2.9 bhp, Q40 version (higher timed) 3.6 bhp, F3D version (higher timed w/full pipe) at around 4.0 ... don't quote me on that but I think it's pretty close.

Who knows what those MBs are putting out. Yeef!

Speaking of MB's:
Here's a vid of Robbert van der Bosch flying his MB-powered Dago 2002 F3D at 330 Km/h (205 MPH). Not much to see but the sound is incredible.
http://213.84.42.244:8087/paulraaf/Dago2002.wmv

Here's another video of a F3D heat in holland. All planes are MB-powered. Quality is better then the other video but this one is in divx format so you need to download the codec for this one.
http://213.84.42.244:8087/paulraaf/FAI_pylon.avi

here's the link to the MB site(not updated recently):
http://home.kabelfoon.nl/~fiorimet/

Greetings,

Paul ravensbergen

Magnums have no spars, Blue foam and balse sheeting, with a center balse section glued over for fairing, you could install a spar easy. tho the wings survive crashes ok.
Could e-mail Weston, but this is the UK, we don't jump at mails like US companys yet hehehe.
But i can ask the designer if you want next time i see him

Hallo mec,

from good old austria.

Deine Frage von den verschiedenen Nelson Motoren ist einfach:

N 500 Quickee ist ein Motor optimiert für Drehzahlen um die 20000 u/min, da in den Regeln u.a. die Propellergröße auf 8,75 Zoll Durcmesser früher sogar 9 Zoll festgelegt wurde. Ein Resorohr ist auch verboten. Diese Motoren sind für Dein Projekt sehr empfehlenswert, da der Motor schon mit einem leistungssteigerndem Schalldämpfer geliefert wird.

N Q40 , ist auch mit Seitenauslaß aber für hohe Drehzahlen bis zu 30000 u/min. Es gibt keine Propellerbegrenzung. Resorohr ist auch verboten. Es wird an diesem Motor ein vergleichbarer Auspuff wie am N 500 verwendet nur kürzer abgestimmt.

Der FAI Motor ist mit Front Einlaß und Heckauslaß ( früher auch Heckeinlaß ) und Resorohr für Drehzahlen um die 30000 u/min.
Diese Motoren sind zwar extrem leistungsfähig aber nur in der Hand von Leuten , die damit umgehen können.

Grundsätzlich ist der N 500 Motor der Beste für Dein Projekt kostet so um die 350 US Dollar. Interessant für Dein Projekt sind die Motoren von Dub Jett, da er auch heiße Motoren macht . Evtl. ist ein scharfer ´50 von Jett die bessere Wahl, der er mit Drosselvergaser kommt und wesentlich billiger ist.

Ich sehe einen weißen Bandit in Deinem Logo.
Ich habe auch den neuen Super Bandit mit einer 16 kg Turbine.

Go fast and turn left.

Michael

hi michael,
thanks for your reply. the world got even smaller with the internet

my magnum project is postponed to spring.

when is the maiden flight with your super bandit?

mec

Gentlemen, if you could please Post your comments in English.

This way Everybody can share the info vise being left out in the cold scratching their heads

thanks, BV