engine recomendations...
 

Im getting a lt-25 and am wondering what engine to buy for it. I just like doing some maneuvers and sport flying so I think I want the midle of the road engine size for this plane.

P.S. I know OS engines has come out with a wankel rotory engine in about size .35 it would be nice but I cant find any prices for it (or any where thats saleing it) help please??

thanks all!!!

RE: engine recomendations...
 

I have a problem with a webra 50 when i put my plane up it almost turn off i dont know what is happening please help me

RE: engine recomendations...
 

Sarges,
It's actually a .30 size motor. You can find it at Tower Hobbies here [link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXBY72&P=0[/link] . Cost is $339. If you want my recommendation, get an OS 25 FX. Only $85 and will have plenty of power for a LT-25. [link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXBY42&P=0[/link]

Hope this helps

Ken

RE: engine recomendations...
 

what are you doing with this engine. does it surge or idle properly? have you made your own thread topic about this yet? you will get better help if you make your own thread. how long was it up? is the fuel tank wraped in foam? is it tuned? these things we need to know.

RE: engine recomendations...
 

nm im a dumb arse who cant read. read the ad and found what I needed. sorry.

RE: engine recomendations...
 

Sarge-

If you didn't already reach this conclusion on your own (which you probably did), you REALLY don't want a wankel rotary engine on your LT-25. 1) It is prohibitively expensive, 2) they drink way too much fuel for the power they put out, 3) I've heard they're pretty heavy, and 4) I believe they are a little difficult to keep running. Basically, they're kind of a novelty that has been around for at least 25 years, but are not really practical.

If you really do want to do something other than standard 2-stroke, go for a small 4-stroke. A Saito .40 or .30 would work well. A Magnum .30 can be had for less $, currently $129 at Tower.

-Scott

RE: engine recomendations...
 

Not trying to start an argument about the OS Wankel, but from the reading I've done, I'd only agree with #1. The people who own them report that their power, weight, and fuel consumption are similar to a .40 size. The biggest issue I've heard about is keeping them cool, especially the original version. I do agree with your conclusion, at $340, they're not particularly practical, certainly not on a trainer aircraft.

I've had good luck with my OS FS-30.

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A flying buddy has a Wankel. He only ran it long enough to be sure of its characteristics. He complained that didn't put out the power to justify the high fuel consumtion. Watching the performance of the plane I agreed that the power output was no big deal. A 25FX would have enough power for the LT25. I have an OS 32SX on my sons plane and it can take off in about 15 feet and then go vertical! The engine is a bit pricy but the power output is high, the engine is quiet, and its very good on fuel useage. A few tips: join the wings together with only 1 1/2" total dihedral. The plane will still self level and will be able to handle windy conditons fairly easily. Also replace the bolts with standard wheel axles and go with 3" light weight wheels. Go with 1" tail wheel instead of the miniscule 3/4". [8D]

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Don't worry, Chuck. You won't start an argument with me. I've never owned a Wankel. All my info is third-hand and therefore likely not accurate. Number 1 is enough to keep me from ever considering one. There is so much else I could do with $350.

-Scott

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Me too. I bought an entire .45 size boat (boat, engine, radio and hardware RTR, just had to add battery and fuel) this summer for less than one Wankel. I've looked at them several times. I think one would be great on a plane with a big round cowl, such as the Marutaka F4U Corsair kit I have, but I just can't justify the money.

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could purchase many a kit airplane for the price of teh wankel. me no longer looking at a wankel motor. thanks all.

RE: engine recomendations...
 

If you want a 2-stroke, consider the Magnum XL-28 or XL-25. Both are around $60 from Tower, about $25 less than the OS 25 FX.

Chuck, just to be contrarian, I still think your Corsair would be nicer with a suitable 4 stroke and dummy cylinders to make up the rest of the radial.

-Scott

RE: engine recomendations...
 

Thunder Tiger GP-42. Good engine, reliable, economical. I've looked at the LT-25 and have always thought that the TT GP-42 would be a perfect match. I've had a couple of these motors (one is on my Kadet Senior, beleive it or not) and I can tell you for the price, they're a bargain. And certainly plenty of power for the LT-25.

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The GP42 is a good engine but may be over powering the LT25. Q. Whats the problem with that? A. the LT25 is quite a floater. There is one at our field with a 40 size engine on it and at idle the plane cruises around the sky at just above walking speed without losing altitude! Most of the time the guy has to kill the engine to get it to land. My sons has an 32SX engine on his and its hard to get it down as well. [8D]

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I hear ya! I've got an old Saito FA-45 that might work well, but I've got a while to decide. There's a couple boats and several ARFS that are higher on the priority list. The Corsair and many other kits (P-51, Little Half, F4 Phantom...) are going to have to wait til I feel like building again. Right now I'm having too much fun flying planes and racing boats to spend the time building.

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I had a gp-42 on the lt-40. I still own it but have replaced it with a os la .46 engine. that gp was tight!! it was so tight that when you started it would only get one puff out before it would allmost seize. I had to mount it to a test stand, oil every thing down with castor oil and get the duwalt 18 volt drill to turn it over. I had that thing spining untill it finally loosened up some. then we tried to start it up with the prop on and it took a few whole fuel tanks before it would start reliably. I dont think its that great of a motor but that is only one example.

RE: engine recomendations...
 

For a .25 size engine, check out the Norvel. They make FANTASTIC engines. I've got half a dozen all-told, including a .40.

www.norvel.com

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Oh yeah, they are tight when you first get them. Just about squeak through top dead center, but loosen up once you run them. I ran mine on a test stand for about 45 minutes (starts and stops and cool downs), but once they have been run in, they run great. I have two GP-42s, both are great and I wouldn't hesitate to buy another. I still think it would be a good motor for the LT-25, certainly experiment with different props (lower pitch larger diameter). I don't think it would be over powering it at all. The LT-25 is a pretty good size plane, a good source for power is a good idea. A TT GP-42 is an economical solution. I've got one on a Kadet Senior, and learned how to fly with that combo, but now wish I had more on it. The second one I used on an Avistar that I flew the heck out of until I decided it wasn't worth fixing anymore. And it flew great with it. Personally I think it would make a great sport flying plane. But I do admit I've have a lot of success with the GP-42. Happy researching. Tom

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Hello; There are two LT 25's at our field, one has a surpass 26. This engine pulls that oplane around great. The other one has a K & B 28 sportster. I would use my little enya 40 four stroke with the open rockers, it would deliver enough power to fly that bird.

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For my money, the best .25 out there is th OS .40 LA. Light, powerful, and cheaper than dirt. If you prang the airplane you are not out that much. It may not last as long as other engines of its power/weight, but it will probably out last your trainer.

Cheap,fast,fun: pick two.