Are Stalker motors still available?...looking for a 46 side exhaust

I might consider another Stalker, but only if they have re-engineered the muffler attachment.  One of mine has O-rings, which must be replaced after 3 flights.  The other has a screw coupler, which is never tight enough.  Why can't they use a couple bolts, like RO and PA engines?

F.C.

I might consider another Stalker, but only if they have re-engineered the muffler attachment.  One of mine has O-rings, which must be replaced after 3 flights.  The other has a screw coupler, which is never tight enough.  Why can't they use a couple bolts, like RO and PA engines?

F.C.

Hi Floyd.

What kind of O-rings have you used? At least the ones that come from Yatsenko's (made at Antonov plant) last very well. I'd guess that Stalker uses same material. And you can buy even better ones easily from smallparts.com. You just have to figure out the size (in mm). Both Viton and softer silicone rubber rings work well.

Lauri

Been a fan of Stalkers.  Wasn't aware of the factory direct option. Do you have a link ?

http://stalkerf2b.narod.ru/

or email

stalkerf2b@mail.ru

Brett,

Please tell why&how they did not work.
I must say that I have not used Stalkers myself, but I have flown thousands of flights with Retro engines, they have a slip fit muffler mounting, sealed with an O-ring. Very little problems. And now with our own engine with similar construction, allready over 1000 flights sans problems.
But I agree that not all Stalkers have got it right; some have a "hard" muffler mounting, bolted directly to case and some have a single big thread. In my opinion that's asking for trouble. It's important that the silencer can float without a hard connection to the engine, and also have a flexible mounting in the rear end of muffler.
By the way, one good trick is to wrap 1-2 layers of thin Teflon (for plumbing) tape over and under the O-ring. It protects the ring from burning and getting stuck in the aluminium surfaces.
Only modification that I will make in our new engine is to have 2 O-rings instead of one. It should be a little more forgiving in use. But if the fit geometry is correct and parts well prepared, one ring is just fine, too.

Lauri

You know the thing is, that every time you remove the muffler you better put a new ring. I have found out that once in place, the new ring lasts very well but it inevitably burns stuck into the metal surface and gets damaged when you remove it. So never re-use an old o-ring.
As I said, my red silicone  o-rings feel better but I may have to use a diferend interference fit with them. Silicone is more brittle under compression but it seals better with looser fit than a Viton ring. I think my final solution is 2 silicone rings.
Another thing; a good teflon grease, like Fomblin UT-18 helps too. But then you must find another way than friction to prevent the muffler from turning.

Lauri

yes the o rings are a problem with stalker r e motors  what i did was shorten the first part of the silencer and couple it with a piece of silcone coupler with some tie wraps i did this for over ten years  in my opinin the staker 4 2 4 large case is much more easier to tune to your way of running than a retro the retro engine is locked into running the way the yatchencos made it    it must be used their way or you will kill your self trying to make it more american running 

yes the o rings are a problem with stalker r e motors  what i did was shorten the first part of the silencer and couple it with a piece of silcone coupler with some tie wraps...i did this for over ten years... 

Somebody I know did exactly this with their Stalker, but I can't recall right now who it was or which Stalker it was done on. Good plan, I think!  Steve

Try these guys http://technohobby.com.ua/online-shop/en/engine-stalker-st46-se I've not personally dealt with them but from others here in New Zealand I've spoken to I hear they are good to deal with.

Just got my hands on a ST51re and can't wait to get it in a plane.

Hope this helps

Dan.