I fly a 3d profile with a OS 55AX. I only got a 600rpm increase using a Jett / Evolution performance exhaust over the stock muffler with baffle removed. APC 12x4 13,900 vs 14,500 rpm. I heard that stock the Evolution 60NX has a throttle transition delay which makes the engine junk for 3d, however several people with the performance tuned exhaust said the engine was transformed.

So does this engine transition a lot quicker with the Jett clone muffler? Good enough for 3d? Can it be modified for a front needle valve, does this help?

Throttle delay is probably due to using a remote needle valve. Evolutions used to ship with fuel lines to the carb that had a very small inside diameter. It would seem that using a larger id line would put the engine on par with other 2 strokes if a throttle delay is noticeable. I would question the 'junk' statement because I notice the delay on most engines myself.

BLW, I'm not so sure on your theory about the ID of the fuel line. The fuel is regulated by the hole in the spraybar, and thats smaller than the ID of the line.

I use small fuel line on most of my motors, and most are fuel PIGS (3-4 ounces of 15% per minute) and the small ID is not an issue. There may be a backpressure issue however, but the line is plenty big enough to deliver enough fuel to the motor.

If you are asking about this setup, you ignored tons of great advice in a thread elsewhere.
Why would you still be asking without first trying the other suggestions?

You mean this one:


http://www.youtube.com/watch?v=NDLX6btZSoc


Is that mean Ara flying aiplane as a helicopter Again?

Throttle delay have nothing to do with using a remote needle valve.

I've heard this misconception many times. Just how are you going about to putting larger ID fuel line to the engine?

If you getting throttle delay, it is most likelly due to the improper tunning settingsof the engine.

.

These planes fly way better than profiles. The Profile Brother Hood should change their name to "Broke People Who Want To Fly 3d .com"

Hey, just want to help, then you calling people names, not nice.

Ok, so I didn't feel like making a muffler with a beer can.... big deal.

Let's see your video of your bird doing some 3D. Show us how it's done, please.

That is Ok, you can still tune engine to a proper throttle responce with out any performance mufflers(BTW engine with performance muffler is even more sensitive to carburator adjastments then a stock muffler), it is usually covered in an engine manual, in every major brand sold in USA. If your engine throttle responcestutter, then it simply means that the engineneeds an adjustment, that is all.

That was just one of the tips you ignored.

Others include but not limited to:
1. 13x4 Xoar or APC - the right prop for 3D on a 55AX
2. Macs one-piece #6720 instead of the stock with baffle removed. Saves 2 oz.
3. A Saito 82 seems to work better for beginner 3D'ers
4. A lighter airframe
5. Careful tuning even with the stock muffler will still 3D just fine.

Ara, profiles aren't cheaper but they sure fly 3d better at this size.

This forum I am sure will not tolerate your flame. You guys have a weakness and sickness to participate in such a flame you should feel terribly about your selves. You flamers are of a lower class than the rest of us.

Where in this thread were YOU called names?
You just called us morons and lower class.
That's 2 strikes against you and none against us.

We are just trying to help you but you keep doing your own thing.

I tried a 13x4 APC, the throttle resposne was not as quick and it made slightly less thrust than the APC 12x4.

No one ever said anything about the Macs muffler

I'm flying a poor man's 3d plane, I don't have the extra $150 for a Saito 82 but I agree that would be the best engine

Yes the airframe is a little porky, and to be honest it doesn't 3d that well anyhow... but otherwise it flies very well and smoother than any other profile I have flown. The airfame is also very durable.

Stock muffler with the baffle in was "scary" when trying to hover. It provided only a ounce or two more thrust than weight. The baffle outgave it a decent power boost.

And diss the aeroworks all you want... It will still do knife edge figure 8's with the left stick only. Its a pretty good flying airplane in general.

It is a FLAME BEING CARRIED ON FROM ANOTHER FORUM WITH YOUTUBE LINKS POSTED MOCKING ME....

I would agree with Blockbuster that remote needle valves do not cause throttle lag unless your fuel line is very elastic and in that case it would cause all kinds of running issues.

But I did suggest a macs muffler as I pointed out that I ran one for example.

HI
you prop an airplane and the best prop for the engine on a given airplane ,so sometimes a 12/4 or 12/6 might be better than a 13/4 for a given planes weight and shape (bi-plane or single wing ETC ) DIFFICULT to say a 13/4 prop on a 55 AX would be best on all planes could be a good place to try and start your testing-vertical performance is always my bench mark for performance BEST REGARDS TONY

In this case, it's for a 3D plane, not a see how fast you can go plane as the first post indicates.

It is not, on YouTube link, is "You" mocking everyone that like to 3D and calling 'em STUPID(you just happen to be one of 'em who like to 3D apperently). That is not cool, BTW.


So there is no need to call people names if you want to have a civil forum discussion and learn more about flying.

..deleted.. not worth it.

Because I've had new engines with tiny diameter fuel tubing that is almost impossible to slip off and back on the nipples without tearing. Whatever brand this is, it usually starts leaking air soon.

The delays are sometimes real and I know how to tune engines. It was an observation, not something to start arguing about. There's a lot of reasons for the lack of instantaneous power.

Several posts were removed for name calling and arguing.