RE: O.S .65 LA engine
 

Chuck,

Welcome to RC Universe and may you have many more posts

RE: O.S .65 LA engine
 

I had an LA 65 on a Hanger 9 ultra stick 60. it was a very light set up and a ball to fly. It would do anything I could ask it to do and fly slower do to the low weight. Backwards in a moderate breaze was easy. I got it WELL used out of a plane recovered from a tree. Flew it ALOT for three years. I would by another without hesitation.

RE: O.S .65 LA engine
 

Hello everybody,

Brand new to the hobby... First post here and am getting close to my first flight ever/maiden flight on Hobbistar 60 with the .65LA. As I am a bit of a motor head I have been looking for a tuned pipe for the .65LA, I see Macs makes a pipe for that "size" engine but I have yet to find a header specifically for this engine. Anybody have any knowledge on a solution for this? Looking forward to getting airborne.

Thanks in advance,

Mike

RE: O.S .65 LA engine
 

My first plane was a Hobbistar 60 with a .65LA. I thought it was a great plane.

Do what you'd like, but the .65 is plently of power. I snapped the middle of the wing three times (had to apply new epoxy each time) and didn't realize it until I landed and only the rubber-bands were holding her together.

Not sure abou the tuned pipe for a .65, but with or without, the plane is fun for a first plane.

RE: O.S .65 LA engine
 

I do not have alot of experiance with many engines.  But I bought a 65LA back in 02 and ran it for the summer.  I left it in my garage sitting until last summer.  It took a bit to get it started and running well but it purrs like a kitten again.  Lets see, it sat unused for 7 years.  But you cant tell it now. 

RE: O.S .65 LA engine
 

I am going to install my LA 65 in a U Can Do 60 and try props like 13x5  13x4 and see what it can do.<div>
</div><div>Fuel - 15% made it come alive in my other plane.</div><div>
</div><div> Needle valve - Its hard to tell lean from rich.</div><div>
</div><div> Another thing.-  No engine can be rated without trying a hand full of props first.       For example - A real twin engine plane dead stick will fall out the sky if the props did not feather. And my U Can Do will not hover if I try a 8 pitch prop. I need to find a low gear for this plane .</div><div>   A prop in a dive will brake. ( Half throttle or Idle same speed in a dive.) A lot of guys do not even think about this.</div><div>
</div><div>Also a 13" prop is as long as you can go with this engine . Because the tips of your prop can not brake the speed of sound. </div><div>
</div>

RE: O.S .65 LA engine
 

I had an OS65LA that I had on a Texan II.......forget the manufacturer's name but it was a pretty big airplane. The 65LA moved it around smartly and was easy to start and maintain. Way back when, about all you could get was bushed engines........and they flew and lasted a long time. I have 2 OS25LA's on my Twinstar and they fly really great. I've never had a flame out and rarely have to adjust them......that's a thing with twins.......keeping them sync'd but I have not had a problem with my LA's. Had two OS40LA's for another twin but ended up giving the whole package to my son. I'd give two thumbs up to the motor you asked about.

Andy

RE: O.S .65 LA engine
 

OK everyone,

Thanks for your replies and insights, I have read in other threads that some think that the OS .65LA will not respond to a header/tuned pipe due to it's timing characteristics. I can now say with assurance that it responds quite well. Please see this video that was taken yesterday.

Thanks, Mike

http://www.youtube.com/watch?v=fmIVi9G5_EE

RE: O.S .65 LA engine
 

Watch out for air leaks at the plastic back plate.

RE: O.S .65 LA engine
 

I have had the 65la on my pt60 since 2002.  I didnt fly it or run it at all for 7 years.  Left it in the garage.   It runs today just fine and all I did when getting it ready to run again was remove tearit down and lube it well.  Put it back together and I would love to say it started right up, but it ook some work.  But eventually it started and I basically went through the breakin again.  Now, after flying it last season, it pulls the 8pd pt60 around with authority.  Take off roll is maybe 20 ft on grass.  It still takes several flips to get it started.  But it runs ok once it does start. 

RE: O.S .65 LA engine
 

I have an OS 65 LA in an kangke su 26 profile weight is 5.25 pounds with a heavy metal gear servo in the tail for the rudder and a 6 volt pack. Kept the standard 6 ounce tank. The engine spins a 14x 4 Xoar wood prop at 10,000 rpms with a great idle and a nice transition. The xoar transits better than a heavier APC 14x 4 wide. Fuel economy is great with 10 to 12 minutes on average.

I would not compare this to a 45 power wise because it obviously should and does have a lot more torque. I chose it so I would not have to spring another 100 bucks for a 4 stroke of similar weight/power (it’s a bit heavy but the short nose makes it a great balancing tool!).

It certainly does not have the broad power range of a 4 stroke but it spins the big props on a small 3 d profile with no problems.
Contrary to what has been written in this thread I have not found bushed engines to require a lot of care- quite the opposite. I have some old FP 40’s that still run flawlessly after 20 years.

The only thing is you can't “re bush” the engines cheaply so once they are done they are done. I run mine between 18 and 20% oil 10% nitro. I do agree they are not powerhouses and would keep them in lighter planes that need big props to perform or trainer types. That is the perfect application for them. And of course its nice to spin a big prop with good fuel economy.
I love this combo for a 40 to 50 size profile and am building another one exactly the same!
I am also going to try a 65 AX which is lighter and more powerful and fits the “super muffler” as well in a 3rd kangke su 26.

Have fun!

RE: O.S .65 LA engine
 

I read once that the power gained from ball bearings is just about enough to carry the extra weight of the bigger crankcase. Don't know if that is true but it sounds good.!!! For glow flying a bushing is probably better and easier to maintain. Bearings will rust. I had a TT bushing 40 that would scream.

RE: O.S .65 LA engine
 

6 to 8 years ago, Model Airplanes News did a .61-sized engine shootout. As I recall, the OS .65LA out turned the OS .61FX on every prop except the 11-7. They were close, as were all the engines, but the .65LA was surprising.

I bought 2 of them and have never regretted it. They are fine running and reliable engines despite the air bleed carb. They tune up easily, run strong, never quit and rarely, if ever, need tweaking. They run so well, my flying buddy, who is 89, snagged both of them for use in scale planes.

RE: O.S .65 LA engine
 

Anyone else tried the 12 ounce aluminum beer bottle moose can mufler style? My VERY old LA 65 was starting to wear out and I put one on and got a goodly boost until the motor tanked. It was really loose in the front bushing area before the pipe went on, seriously close to shot. I had good verticle out of it for a couple days of flying [>:]

RE: O.S .65 LA engine
 

LA 65 is perfect in a Supersportster 60   (unlimited vertical with a 12x6 prop. including full 6oz. smoke tank)

RE: O.S .65 LA engine
 

I sold my 60 sportster kit to my father cheap too. Wish I had kept it. I have just got myself a 65 LA brand new for £49. I could'nt resist. I have 3 bush bearing 60 class engines now and I'm gonna test them all. O.S LA 65, O.S FP 60 and a K&B 65 sportster all brand new ready for break in. I have looked at alot of 61 ball bearing engine readouts and was not that impressed with prop rpm's they just have not got alot on the bush bearing engines. And there are a few good 50 size engines that can match them ie weston uk and the webra oh and MVVS. I only have 1 ball bearing 61 but that's a Fitzpatrick. All of my other engines that I use for good power in 60 size planes are 70 class engines they are about the same weight but notibly more power than my bush bearing engines and the ball bearing engines. Irvine .72, Super Tigre G75 , Profi .76. I don't think that the 65 la or the fp are that light around 530 grams without exhaust but should be good to see how they compare against each other. But I will throw this in to get your head around the lightest 60 class engine I have is a russian Zeus .61 at 476 grams it's real light that is with the exhaust on it 416 grams without I had to measure the stroke and bore just to make sure that it was'nt a 40 just amazing oh and it's a ball bearing engine.

RE: O.S .65 LA engine
 

Not really an issue when using the correct fuel.

A bronze bushing can last for several hundreds of hours if there's enough castor in the fuel. I've got a late 1950's vintage Fox .29 that easily has several hundred hours on it. The bushing play is still perfectly acceptable, and compression is still good enough to flick it by hand and get one-flip starts.

RE: O.S .65 LA engine
 

I have an OS 65LA in a Hobbistar .60 Select. Flight school starts tomorrow. Woo hoo!

RE: O.S .65 LA engine
 

I was thinking of trying to get a FOX FALCON .60 they are bush bearing and really light how do they compare to the LA and FP anyone. I think I will use either 2 fuels in my fp and la Supaglow 10% nitro 16%EDL and %4 Castor. Or straight %20 castor %10 or 5 what ever it runs good on not sure yet.

RE: O.S .65 LA engine
 

Nothing wrong with the Fox Falcon. With the older Fox 2 and 3 needle carbs you need to follow their instructions on setting the needles since its somewhat different than most other engines. Most of the time when people complain about a Fox not idling well and the carbs sucking its because they didn't follow the instructions.

RE: O.S .65 LA engine
 

Post 31  Correction -   A 14x4 Prop will work on this engine.   It will slowly pull 7.5+ lbs. vertical. And slow up a landing very well.   Knife edge with a 14x4 ? Forget it.<div> runs best with15% Fuel, med. glow plug.  </div>

RE: O.S .65 LA engine
 

The 65 LA . has more grunt than the .61 FX in fact for most use it has more power than the .61 FX.

Hey guys,

I have a Sig Hog Bipe kit that has been shelved for about a year. I recently acquired a brand new but broken in 65LA in a case of charity. I looked over this thread and there seems to be mixed opinions about this engine. Is it going to be enough to pull my Hog around with some middling 3d? Else if I have to spend out of pocket for gear, I will go with a brushless setup. What do you guys think?

Wow, this is an old thread! I flew the Hobbistar with the OS 65 LA in it until this spring when I decided I'd had enough of glow. I sold the engine and a DLE 20 is going in its place.

The engine was a solid performer, though. Plenty of power and never a problem.

First the Hog Bipe is not a 3D airplane and that is the bottom line. It will never do the prop hanging type of stuff if that is what you mean by middling 3d, the control surfaces are far to small for that and the structural density is to high to acheve the power to weight ratios to do that type of flying. It is a superb flying airplane and fully capable of conventional types of aerobatics. The .65LA will fly the airplane in a workman like manner if not spectacular.

Be aware before making quick decisions about converting airplanes to electrtric. That can get increditably expensive very rapidly when wanting to convert just any old airplane to electric (remember that high structural density thing). These kinds of conversions are seldom very successful in terms of what the owner/flyer really wanted.


John