Modern .25 for Stunt?

[Dennis Leonhardi]

It’s probably been well covered, but here’s my Q:  Do any of the reasonably priced, modern .25 engines provide a decent “stunt” run?  I’m especially wondering about the OS Max FP and LA engines and their Magnum and Thunder Tiger contemporaries...

And, if you name one you like, how much fuel does it need to complete the pattern?

Thanks!


Dennis
 

[Mark Scarborough]

Dennis, it you do  a search, you will find a massive amount of information on the FP .20 and .25 as well as the LA .25

[Clint Ormosen]

Short answer is yes. Do a search on FP 20, FP 25, or LA 25. Lots of topics on these.

(oh, Mark beat me to it.)

[Geoff Goodworth]

Brodak 25 should be worth a look.

[peabody]

If you are looking for a "traditional" stunt run, no.....the newer engines (including the Fox 25) all perform best with a flat prop....most work well with a 9X4.....
Have fun!

[Bill Little]

Hi Dennis,

Are you wanting a traditional 4-2 style engine?  If so you will not like the "new" .25 other than possibly the Brodak .25 (which seems to be out of stock all the time! LOL!! )  Possibly the Enya .25SS, but I have not seen one of those.

The one Available .25 that powers planes that used to use the Fox .35, and I like is the OS .25LA.  BUT, it is used stock with a 9-4 to 10-4 in a just off peak 2 cycle.  It does a great  job in that mode.  I do recommend replacing the plastic back plate and using the NVA from the OS.FP .20-.25.  They are still available and track easier than the remote.  Some fly "forever" with the plastic back plate, but all the ones I have seen in use DO develope a leak.  The OS .20-.25FP back plate is a direct swap and board member Curtiss Shipp makes ones that are very nice.

BIG Bear
AMM

[Chris Wilson]

There is nothing wrong with the Enya 25 SS at 210 grams and wonderful quality!

[Bill Little]

There is nothing wrong with the Enya 25 SS at 210 grams and wonderful quality!

HI Chris,

I never said there was anything wrong with it, just that I have never seen one and I don't know if it will do a 4-2 "stunt run" or if it needs to run in a wet 2.........

BIG Bear
AMM

[Chris Wilson]

HI Chris,

I never said there was anything wrong with it, just that I have never seen one and I don't know if it will do a 4-2 "stunt run" or if it needs to run in a wet 2.........

BIG Bear
AMM

Hey Bill,
     my post was not aimed at you mate but I do have a friend with quite a range of Enya SS engines and they all seem stunt friendly and run best in a fast in a wet two stroke.

I just like the look of Enya's wonderful castings and  modern schnuerle porting but the SS 30 would really be my choice in this 'range' as it's lighter and more powerful.

[Bill Little]

Hey Bill,
     my post was not aimed at you mate but I do have a friend with quite a range of Enya SS engines and they all seem stunt friendly and run best in a fast in a wet two stroke.

I just like the look of Enya's wonderful castings and  modern schnuerle porting but the SS 30 would really be my choice in this 'range' as it's lighter and more powerful.

Yep, the .30 would be my choice, too.  You can always use more power with less weight!

All my Enyas are from the '50s-'60s.  And none of them have worn out yet!  GREAT Engines.

Bill

[PJ Rowland]

Aerotiger .36 is almost impossible to beat for weight and performance.

[Chris Wilson]

Aerotiger .36 is almost impossible to beat for weight and performance.

Pity its not a .25 ci though PJ.

[PJ Rowland]

I realise that - I was giving an alternative engine choice - Im an advocate of more power for any model, depending on what its going to be used for - Most people want that sized engine for a classic ship or smaller classic style. .25 are ok.. but the performance envelope will go up drastically with the .36.

Plus one of the requirements asked for was " decent “stunt” run " Which the AT.36 will provide.

I prefer more power in all my Classic ships...

Chris : Enya 30 is 225 grams - or 7.9 Oz no muffler - just think you can have DOUBLE the capacity for only 2.7 oz more, obviously im not talking about the Aero Tiger .36... However I wouldnt hesitate to run one in any comp spec classic ship - It simply blew my mind 1st time I saw it. Randy did an excellect job.

To balance out 2.7 oz of extra weight in the nose of the engine in most normal classic sized ships will be less than 10 grams of tailweight - this is due to the pendulum effect.

[Dennis Leonhardi]

Thanks for the input guys!  Yes, I had hoped someone might have come up with something near the traditional (does that make me old?) 4-2-4 run with a modern 25.

Bill, you've already sold me on the Aero .36, I've got a NIB Thunder Tiger .36 ready to send to Randy.

The old 3-bolt backplate Fox .19 and .25 of the '50s were superb pieces of machinery.  I owned and ran several, and they were quite light at 4-1/2 ounces.  But they lacked the authority of the modern .25s.


Dennis
 

[Dennis Leonhardi]

What does the Aero .36 weigh, sans muffler?


Dennis

[Steve Thomas]

Chris : Enya 30 is 225 grams - or 7.9 Oz no muffler -

I think you'll find that's the 2BB version with a big ol' RC carb hanging off the front. The regular plain bearing CL one is only 195g - not bad at all for the power it puts out. I really like both it and the SS25, but if you want a traditional 4/2 run you need to look elsewhere.

[john e. holliday]

Thanks for the input guys!  Yes, I had hoped someone might have come up with something near the traditional (does that make me old?) 4-2-4 run with a modern 25.

Bill, you've already sold me on the Aero .36, I've got a NIB Thunder Tiger .36 ready to send to Randy.

The old 3-bolt backplate Fox .19 and .25 of the '50s were superb pieces of machinery.  I owned and ran several, and they were quite light at 4-1/2 ounces.  But they lacked the authority of the modern .25s.


Dennis
 

I think if you try one of the new .25's in the right size plane, you will also find it is  easier to get your timing down.   Sometimes the 4-2-4 stunt run does not stay that way, even with the old Fox Stunt.   Like weather, dirt in fuel and old glo-plugs.   Of course they affect the other engines also.   

[Dennis Moritz]

I used an LA25 on an ARF Flite Streak, a number of years back. 9x4 prop I believe. Mounted it, ran a half tank through it, then flew it for a season and a half. No muss no fuss. At some point I went to a through the venturi FP needle valve. Tho the remote set up worked. Got me into Intermediate. One day the nose fell off. Typical issue for that ARF. Actually it ran sweeter, with less tinkering, than just about anything else I've tried. Including LA46s which I have found to be exceptionally stunt friendly. The LA 25 has proved to be quite flexible as well. Some club members are using them in speed limit combat with a bladder. Those engines will scream if you prop them to wind up. Very impressive. Quite a racket. FP 25s will also sing a screeching tune, perhaps run a wee bit faster. Much tapping in cyberspace about FP 20s and 25s as beginner stunt power. A left coast favorite.

[Martin Quartim]

I think you'll find that's the 2BB version with a big ol' RC carb hanging off the front. The regular plain bearing CL one is only 195g - not bad at all for the power it puts out. I really like both it and the SS25, but if you want a traditional 4/2 run you need to look elsewhere.

well at least one Expert friend here says some of the guys in his circle are  running the Enya SS30 in a good 4-2-4 with a 10x6 prop. I have not seen it, but this guy, a big time ST 4-2-4 promotor, would not brag about an Enya in 4-2-4.

But this is how I like it

I kid you not, sometimes I bring this Ringmaster as a back up. If windy condition gets insane it is Ringmaster Time. Strong wind and Turbulence will not upset this combo and I will complete the pattern while most will fall out of the sky.

The SS30 with the Stock Muffler is much lighter then the OS 20FP, has all the speed control mumbo jumbo, plus it can be setup in many ways with a wider range of props.


Martin

[john e. holliday]

Pattern looked great to  me.   I see you have an inboard tank.   Did you have any problems setting it up?

[Martin Quartim]

Pattern looked great to  me.   I see you have an inboard tank.   Did you have any problems setting it up?

Hi Doc,

Thanks for the compliments, but I did several mistakes. I can do better if I practice with it. Also this model has several problems, too much ruder offset and a warped wing. It flies pointing out a lot.

I secure the Sullivan 4.0OZ RST tank using Scott 3M cristal clear tape and plumbed for uniflow following John Miller tips. The engine seems not to bother to much with tank height and it worked in the first try. I did had problems running oval profile metal tanks mounted inside. I think mounting the tank on the inside has advantages, it will richen the mixture if it tries to go faster and lean if slows down, helps to keep the speed.

It does not take that long as people claim to break in an Enya engine. I ran the engine on the bench for about an hour during an afternoon and went flying. 

Martin

[Steve Thomas]

well at least one Expert friend here says some of the guys in his circle are  running the Enya SS30 in a good 4-2-4 with a 10x6 prop.

Well you learn something new every day. I had no idea, maybe because it never occurred to me to try a 10x6!  I run mine much the same as you, Martin - can't help thinking that a 4/2 with a 10x6 mightn't really be getting the best out of an SS30.  (The SS35 does a really nice 4/2 by the way, if you choose to run it that way.)

For someone wanting something a bit different in a .25, Enya's SS25 diesel is excellent. I've got an AAC one which weighs only 200g.  The sound is so mellow that I can do without a muffler, so the overall package is very light indeed.

[Bill Little]

HI Steve,

Being a long lost stunt flier, I tended to think of a 4-2 run being necessary.  Then I flew a proper size pane with the OS .20FP BBTU.  An eye opener for sure!  Now I think of a wet 2 for the modern engines all the way up to the LA.46!  I still run the "old" engines in a 4-2 but it is amazing what the new engines will do if run at a higher rpm and lower pitch.   I don't see any of the new engines under about a .46 running any other way it seems.  It is also amazing how much more usable power these new engines put out when run in the high rpm low pitch mode.

BIG Bear
AMM