Muffler exit deflector
 

Will this help at all with all the oil collected at the end of the day on my NexStar?

http://www2.towerhobbies.com/cgi-bin...?&I=LXL378&P=0

RE: Muffler exit deflector
 

Just put them on 2 planes yesterday. Not pretty but very effective. After hours of flying, cleanup was quick and easy.

Del

RE: Muffler exit deflector
 

Yes it will help some, but you will still have some clean up to do. I have heard you will loose "some" power, bvut I do not know for sure.

I use them on my low wing planes and it does keep all the extra oil on the bottom of the wing and I almost never have to wipe any off from the topn of the wing or above the top wing so it does save me clean up time on them. I also did not notice any loose of power.

RE: Muffler exit deflector
 

no power loss, and yes they help a little to keep the fuel off the fuse, several of my planes have them and they work pretty good.

RE: Muffler exit deflector
 

I have had no luck with them, I lost so much power my plane couldn't get off the ground, took them off and engine ran fine.

I guess it depends on luck.

Dave trimmer

RE: Muffler exit deflector
 

I've heard of rpm loss of maybe a couple hundred.....never a major power loss??

RE: Muffler exit deflector
 

There is also an excellent silicon tubing available that works very well, and might actually do better in some cases.

It's sold as "tuned pipe connector" tubing and comes in different sizes. It's in 1 foot lengths or thereabouts. You cut however much you need.

If you look at the blue "buck teeth" on my Cap, you'll see two pieces of the stuff.

Being straight, it doesn't have that little backpressure problem. The last piece I bought has provided extensions for my P47, an Ultimate, a SkyBolt, a Decathlon, and I've got some left over.

RE: Muffler exit deflector
 

BTW, it also provides you the ability to deal more cleanly with cowls. You know how much trouble it is to get a cowl over the Pitts muffler pipes? Well, I saw them to a length that allows the cowl to fit easily. And then I push the buckteeth in place. And I got whatever length I want and the cowl doesn't get in the way of that result.

RE: Muffler exit deflector
 

i just got one and put it on and them i also remove the baffle in my evolution 45 muffler and them angled that down to. but i flyin wesday so i will know of any power loss

RE: Muffler exit deflector
 

Power loss is impercievable. Don't be tempted to put longer tubes on though as they WILL cause power loss and engine overheating.

RE: Muffler exit deflector
 

a couple of photos of planes with deflectors,unless your putting them on a Beat engine or its already out of tune I really don't see how they could affect performance that much.
I have added in cowl mufflers to my exhaust system on 4st engines and had no power loss and they are doing a 90o turn I think for the guys that are seeing any diference in performance they need to check there engine out because it aint the deflector doing it.
the opening to the deflectors are actually larger than the ends of there mufflers,if there not then they have the wrong size and need to use the next larger one.

RE: Muffler exit deflector
 

I have never noticed any loss of power using them myself. They usually help a lot to minimize the mess. Depends on its location and oriention. One thing I have always noticed is that the non-metal ones usually make it a bit quieter.


Edit: This one I have on my Magic Extra is way off from the fuse and it takes all day of flying just to get just a slight mist of oil on the fuse and horizontal stab bottoms.

RE: Muffler exit deflector
 

Odd that people lost that much power with the deflector. I use them on pretty much all of my planes to get that exhaust down and away from or up and over the wing. I've never lost any power that could be attributed to the deflector. But again, I don't under power my planes. If it calls for a 40, I will use a 46 or 50. If it calls for a 60, I will use a 75 or a 90. One plane, the Venus calls for a 1.20 and I do use a 1.20, but even with a deflector, this engine pulls my Venus II (and a Goldberg Tiger 120 too) around just fine, pretty much unlimited vertical.

The only plane that does not have a deflector on it is a Hobbico Super Star trainer that I bought as a club trainer, and it has an OS 46 with a MACS muffler. It has enough deflection with the muffler to keep the oil off of the wing.

DS.

RE: Muffler exit deflector
 

i won't use them because they do cause a power loss on 2-strokes,however, some people are willing to sacrifice that loss in order to keep their model cleaner.i just get the baby wipes out after every flight.

RE: Muffler exit deflector
 

On 46 size 2 strokes I have measured the following:

1. OS 46FX -50 rpm

2. OS46FX -80 rpm

3. Supertiger 45 -90 rpm

4. Thunder Tiger Pro 46 - 75 rpm

5. Thunder Tiger Pro 46 - 90 rpm

These engines belong to different people. The tach readings were taken at full throttle, then taken again after installation of the deflector. The deflector was the only change made.

From my measurements with the tach, you will most likely see a 50 - 100 rpm drop with the average being a 77 rpm drop in power. I doubt most people would notice this drop in power.

FWIW - to make sure the exhaust deflector stays on the muffler, cut a groove all the way around the exhaust nipple. The groove should be about 3/32" wide and about 1/16" deep. (A Dremel or trianglular file can do this quickly. ) When you put the deflector on the nipple, make sure the tie-wrap (or small hose clamp ) is positioned over the groove when tightening.

RE: Muffler exit deflector
 

here's my 99cent cheapie hardware store version if ya interested. still get oil everywhere, but not as much. it is a piece of copper plumbing elbow (45*) and a hose clamp. not exactly lightweight, but not enough weight to notice either. I think it looks kinda cool. I guess i coulda braised or silversoldered it on for a cleaner install. i was not sure it would work at first though. I just cut a couple slits in the end that slides over the muffler outlet and clamped it on. it is solid and is not going anywhere that's for sure. I did it to keep the wing and goldenrod from cooking more than any other reason really since the muffler points right at them.

RE: Muffler exit deflector
 

well i flew with the rubber tube and no baffle in the muffer it had a LOT MORE POWER climb very well and just a 45 was pulling my plane all over the sky with some very some winds

RE: Muffler exit deflector
 

The local club president had originally bought one of those for somebody else, but it wouldn't fit their engine and he gave it to me to use in my p-51.
I threw it on and made no other changes to the plane, or so I thought. Unbeknownest to me I accidently hit the switch and put the plane in "landing" mode (flaperons and elevator lower slightly).
I took her off and to my horror the plane did not act like it should. It felt like the plane had suddenly grown tail heavy or something. I thought the problem had to be the deflector and I'd rip that off as soon as I could. I landed it and that's when I saw the switch. :)
It doesn't keep the oil off my wing at all. It just lessens the area to clean.

RE: Muffler exit deflector
 

Maybe you need to twist the exhaust outlet and also re-aim the deflector?

RE: Muffler exit deflector
 

On both my Hanger 9 planes, I have exhaust deflectors on them. I have no performance problems because of it, and my clean up time has been greatly reduced. ;)


Luftwaffe Oberst
Radio Aero Modelers Club
AMA District II
Pulaski, NY

RE: Muffler exit deflector
 

I have one on my OS 40 LA in my AviStar. It cuts my cleanup time by a good 80% so I give it a thumbs up.

I did end up using aircraft safety wire to keep it on, though.

RE: Muffler exit deflector
 

Da Rock
Where can I get this tubing? Thanks ---JIM

RE: Muffler exit deflector
 

hi guys,
im new to this site and i just started my first plane, calmato 40 sport with an evolution .40 engine. (ive used a few EP foamies to get comfortable with flying rc planes).

Ive flown my dads trainers and have seen the mess after every flight.

I have always wondered if we can put a longer deflector, may be something that goes all the way to the tail of the plane. may be holes drilled along  the way to prevent any pressure build up. Sure there will be oil spill/seepage out of the pipe along the way but wont that cut the spray ?

like i said im new to this, and this may be the worst and stupid idea but i want to find a way to prevent oil spray on the fuselage... its not the end of the world and i know a box of baby wipes will do the trick...

RE: Muffler exit deflector
 

This will happen if there is some form of obstruction.

That can consist of

- The deflector selected is too small for the exhaust/engine.
- The deflector is pinched or turned by the cowling or other plane component.
- The deflector is pushed back by the airflow with the plane in flight because of it's position or lack of support.

Properly installed there should be almost no reduction in power. The max I've seen is well within my tachometer's margin of error.

I even have deflectors on my gassers, though the commercial ones seem to max out around 30cc, then I must switch to silicon exhaust tubing.

RE: Muffler exit deflector
 

http://www3.towerhobbies.com/cgi-bin...&I=LXZ668&P=RF

This is just one source at Tower, Central Hobbies Has more selection in sizes etc.