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

Tuned pipe for a OS 46AX

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Old 10-27-2007, 12:04 PM
  #1  
lear31A
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Default Tuned pipe for a OS 46AX

Can anyone with experience tell me of a tuned pipe set-up for a 46AX. Possibly a link to the
correct one to purchase? I have never had one. I know I will need a maifold/coupler and pipe.
I really do not want to cut the pipe etc. to find the correct length. Is there one that is a plug
and play, perhaps? This is going on a Magnum propjet.. Thanks fellers.
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Old 10-27-2007, 12:17 PM
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Default RE: Tuned pipe for a 46AX>>>>>>>>>>

i don't know what type i have on mine (i bought it as a pkg) but it absolutley screams. loud and fast. i then bought a .55 ax, but have not tried the pipe on it yet. the stock p box muffler does not allow the .55 to open up like my piped .46 ax does. when i return from out of state i will see if i can find out who makes the pipe.
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Old 10-27-2007, 12:30 PM
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Flyboy Dave
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Default RE: Tuned pipe for a 46AX>>>>>>>>>>

....these systems are pre-tuned....[sm=thumbup.gif]

http://www.macspro.com/pretunedsystem.asp

You need to call and ask about the correct bolt pattern for your engine. Keep in mind
if you want a tuned pipe....you are going for high rpm, and a big prop won't work.

FBD.
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Old 10-27-2007, 12:41 PM
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Ed Smith
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Default RE: Tuned pipe for a 46AX>>>>>>>>>>

Can anyone with experience tell me of a tuned pipe set-up for a 46AX.
Do you mean a full tuned pipe or a tuned muffler?

A full tuned pipe will work only in a very narrow rpm range and will not idle very well if at all.

A tuned muffler on the other hand will work over a larger rpm range, will idle but will show an rpm gain of about 2,000 max.

If the purchased add ones do not have one both will need a pressure fitting added. A pressure fitting aded to a thin wall pipe will not last very long, it will blow out. A welded on aluminum "Pad" is recommended at the fitting position.

The pictures show the difference between a tuned muffler and a tuned pipe. and the pressure fitting setup.

Ed S
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Old 10-27-2007, 01:15 PM
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Default RE: Tuned pipe for a 46AX>>>>>>>>>>

How about a Jett tuned muffler. I gained 1,700 rpm on my OS .55 with an 11-6 APC. Try a 10-7 prop on the .46AX. For an FX or TT Pro 46, use a 9-7. The AX has more torque than those 2.

[link=http://www.jettengineering.com/]Jett Tuned Muffler[/link]
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Old 10-27-2007, 01:48 PM
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rmenke
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Default RE: Tuned pipe for a 46AX>>>>>>>>>>

Lear:

Guys responding are trying to be kind and get you going in the right direction. First, we need to know what your objective is, go fast fun sport flying, club pylon, etc. Like any other form of motor sports, it costs bucks to go fast. A 46AX in a Quickee can get you up to around 120mph. You can continue to throw money at the AX, but the increases in mph are going to become difficlut. This is a sport engine not designed for high rpm. The good stuff, Nelson, Jett, Profi, some Rossie and Webra are going to cost you $400.00 plus to get you to the higher speeds of around 200 mph. Yes, you can stuff something in a delta, dive from 2,000 feet and achieve something fairly quick for about 200 feet, rpm and power falls on its face at sustained speeds. There are guys around that devote their lives to go fast stuff, go to world speed records and research these exceptional people. They build their own props, engines and planes toward three flights a year at the world speed championships in europe. You may brush sholders with a few on the net. I have one engine from one of the engine builders guaranteed to turn the provided huge prop to 24,000. I have no doubt that the thing will perform as claimed (guaranteed), but I would rather play with a cobra or bomb. Its so modified, scary. Give us a goal, and see what the gang can do to help you in the right direction.
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Old 10-27-2007, 08:42 PM
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Default RE: Tuned pipe for a OS 46AX

Hey thanks for all the info! Basically, heres the scoop on my "Objective". I have a Weston Magnum, you know the yellow one that mostly crash on the first flight, thats the one. The yellow tail over there in the corner of your shop that you keep b/c you might one day use the control horns off of. Yeah, thats the one. I bought a couple of them from a guy on RCU for a decent price and I received it today. I have a 46AX that runs great and I want a fairly quick "sport" type flying airplane out of this model. If I were going for all out speed and did not care so much about idling, I would build a nelson and spend the $1100. for the little airframe,etc. I am just looking to get the most out of my 46AX. without the expense of a decent idle. I sure appreciate everyone here and I am just in awe of some your your speed planes! Thanks again
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Old 10-28-2007, 07:21 AM
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daven
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Default RE: Tuned pipe for a OS 46AX

Then I would suggest adding a $60 tuned MUFFLER from either Jett or Performance specialty. Basically the same thing, just depends if you want it red or aluminum.

www.pspec.com (LOOK at the Sport Version, not RACING)
www.jettengineering.com

The AX is a good motor, I think it would beneifit more from the Muffler at around 15-16k than with a Pipe trying to turn a smaller prop 18k.

If you want a cheap hop up, try a Tower .46 muffler, many say its good for about a 400 rpm jump, which isn't bad for about $15.
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Old 10-28-2007, 09:07 AM
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lear31A
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Default RE: Tuned pipe for a OS 46AX

cool, thanks
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Old 10-28-2007, 12:19 PM
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Default RE: Tuned pipe for a OS 46AX

lear . . . Sounds like you're interested in "sport speed planes". It is what I like. To me, Sport Speed Planes go fast compared to most stuff at the local field, 110 - 130 ish. Nothing crazy like a Nelson on a Q-40 plane going 180+MPH.

I've put a 46 OS FX on a Magnum. I've used both the Towers muffler and an Ultra Thrust muffler. I'm in the low 17,000 rpm neighborhood with an APC 9x7 and the Ultra Thrust muffler. I have tried the Towers muffler and I think it was mid to upper 16,000 with the 9x7. The Ultra Thrust comes in a pylon length and a sport length, if you are really going to turn the RPM's get the short one . . . I think it is 7" total length.

For the price of the fancy Ultra Thrust it is not worth it when compared to the Tower muffler. However, it is has a GREAT sound, and looks really cool. If you have the cash, I would recommend the Ultra Thrust (or Jett muffler). I would also recommend replacing the rear bearing on your 46 with a high speed bearing. If you don't you'll be replacing the engine. I guess I should also say that the motor may unload more in the air with Ultra Thrust as compared to the Tower.

The Magnum is a very nice flying plane. I'm on my second one. The first one had about 30 or 40 flights, I just let it run out of gas and could not bring it back to the field, It landed just off the runway in a tree. I've also moved the CG back to I think about 180 mm from the leading edge (not sure . . . I'll check it you are interested). It is a really fun plane. I guess I probably have about 40 flights on my current Magum. In one of the pictures you can see I added weight to balance the plane right to left, and some more in the tail for the CG. I think it took about 2.4 OZ to get it to balance . . . it is still a light plane.

Vicman might comment, he has seem both my Magnums fly . . .

FYI a fun sport speed project is a clipped wing q-500 plane. I posted a this a while back, might be of interest. - Seth
[link=http://www.rcuniverse.com/forum/m_5016043/anchors_5016043/mpage_1/key_/anchor/tm.htm#5016043]http://www.rcuniverse.com/forum/m_5016043/anchors_5016043/mpage_1/key_/anchor/tm.htm#5016043[/link]

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Old 10-28-2007, 06:48 PM
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Default RE: Tuned pipe for a OS 46AX

I flew the Magnum today for the first time and I love it. It is screaming fast, for me anyway. I used a 9/6 prop and also tried the 10/6. I also flew another little airplane called a Sig Hummer, 1/2A pylon racer. I finished building it last week and flew it today for the first time. It screams as well, for the size anyway. Thanks for the help.
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Old 10-28-2007, 09:40 PM
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Default RE: Tuned pipe for a OS 46AX

Glad you like your Magnum . . . most folks like 'em. I have found a 9x7 apc is the best prop, but experiment and see what you like best. I have a sig hummer covered and ready to . . . just needs a motor. Did you hummer come out tail heavy? I have an Enya 09, but I think it would be too heavy. - Seth
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Old 10-29-2007, 06:22 AM
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Default RE: Tuned pipe for a OS 46AX

I could really tell the difference with the 9/7APC prop. The hummer has a Norvel 074, and it still came out a touch tail heavy. It is a fun and fast airplane. It really shines in the turns, I guess that was what it was made for was going fast and turning.
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Old 10-29-2007, 11:35 AM
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Default RE: Tuned pipe for a OS 46AX

worth noting......

What you see on the ground is not 100% of the story...

Yes, the tower muffler will give you a performance increase at some rpm bands (inadvertantly tuned), but it is not a true turned muffler.

The Jett-Stream muffler and the ultra-thrust are both true tuned systems. Important part there is that once in flight these will continue to improve performance quite a bit .... additional rpm as the engine is free to unload.
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Old 10-31-2007, 10:35 AM
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Gary Szetlak
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Default RE: Tuned pipe for a OS 46AX

I have a Magnum with an OS46AX and the Jett Ultrathrust muffler there was an immediate 1600 RPM increase on the ground and a very noticeable increase in speed in the air. Just bolt it on couldn't be easier. VERY HAPPY with this muffler.
Gary Szetlak
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Old 10-31-2007, 12:27 PM
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Default RE: Tuned pipe for a OS 46AX

Gary.... good to hear it....

The jett-stream muffler does tend to boost about 1200-1800 rpm on most .46 size engines, depending on the prop. Probably is unloading another 300-400 in flight too.
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Old 11-02-2007, 04:53 PM
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Default RE: Tuned pipe for a OS 46AX

I will search for the Jett website and get an "ultra-thrust muffler" on the way. Is it ultrathrust or jet stream?

EDIT: Ok, I found it. Now, do I need the JS-40-TT or the JS-40-ST?
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Old 11-03-2007, 09:23 AM
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Default RE: Tuned pipe for a OS 46AX


ORIGINAL: lear31A

I will search for the Jett website and get an "ultra-thrust muffler" on the way. Is it ultrathrust or jet stream?

EDIT: Ok, I found it. Now, do I need the JS-40-TT or the JS-40-ST?
The Jett Stream 40 TT is for the OS,TT,MAG - and assorted OS bolt pattern engines

THe JS-40ST is for SuperTigre pattern.... works for webra, ST, and Jett
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Old 11-18-2007, 02:45 PM
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Default RE: Tuned pipe for a OS 46AX

Hi. I just ordered the jett muffler for my os 46fx. I had a few Q's. Do's it come with bolts? How long does it take to ship? And im flying it on a wm t-34. Im not into alot of speed i just want a performance boost. What would be a good prop to use? I dont want to have to replace any bearings. Just a good prop for sport aerobatic stuff. Thanks
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Old 11-23-2007, 11:07 PM
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Default RE: Tuned pipe for a OS 46AX

10x7 should fit the bill that is what I run on my t-34 wm it moves
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