SIG Mark II Engine ?
 

<h1 class="vi-is1-titleH1" style="font-size: 18px; color: rgb(51, 51, 51); margin: 0px; padding: 0px; font-family: Trebuchet, 'Trebuchet MS'; ">How is the OS MAX LA 40 engine? Is it a good one? Will it work well on my Mark II ?
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RE: SIG Mark II Engine ?
 

It's a great running engine. It flys most trainers very well. If you have a grass field sometimes they come up a bit weak on pulling power to get you off the ground.

RE: SIG Mark II Engine ?
 

The LA will do fine on your Mark II. Just put an APC 11 X 4 prop on it.

On grass, it helps if the plane is a tail dragger. Still, I have larger and heavier trainers with trike gear that get off our longer grass just fine with a LA .40.

Ken Erickson

RE: SIG Mark II Engine ?
 

Nothing wrong with the OSMAX40 LA it is a good engine.

BUT you should check out the price and availablity of the Thunder Tiger 46 BB. It has lots more power and may be the same price as the LA.

RE: SIG Mark II Engine ?
 

It was discontinued a few years ago. The LA-46 is still in production.

RE: SIG Mark II Engine ?
 

I would go with a little larger engine thatn the LA40.. I have flown the Kadet Mark II for years and two different engines, even tried electric on it once. In fact, the wing on my Kadet was from the original Sig Kadet in the 80's before there was the "Mark II."

I currently have a K&B 40 in mine and it flys well, but marginal on the "umph" factor. I would not try this setup with floats, which I wanted to do at one time.

So, if you are looking, I would recommend going for a nice OS 45 if you want an engine to take you into the future. Or, even something like the Tower engines should work fine (I have not tried that brand, but some people really like them). If this is not your first plane, it would go very well with a 4-stroke and sound like nostalgia in the air:D

RE: SIG Mark II Engine ?
 

I am training beginners with an old Kadet Mk.II powered by an OS .40 FP, which is comparable to the LA. It's perfect. We fly at 1/2 throttle or less most of the time. There is some reserve; not a lot, but then the idea is to avoid trouble, not to learn how to point straight up and power out of it. The student pilot I had last week kept talking about how much he liked that plane.

We fly from a grass field that is kind of bumpy. If the motor is running rich the takeoff looks marginal (but it gets off), but properly adjusted it is absolutely fine.

We also have another club trainer flying with an OS 40 LA and it is fine too. If you have a 40 LA, go ahead and use it. If not, the .46 LA is fine. Also the TT .42 GP is a good engine for a plane of this size. Forget the powerful BB engines. You don't need it and there is no reason for it on this plane. Total weight with a plain bearing motor should be about 5 lbs.

Jim

RE: SIG Mark II Engine ?
 

I get confused with all the initials after the engines.. BB, FP, Gp...etc.. Are these just "Series" or abbreviations e.g. Does "BB" = Ball Bearing..?
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RE: SIG Mark II Engine ?
 

BB does mean ball bearing.
FP is a model of OS engine discontinued before the LA series was introduced. While it is great to know someone has used this engine on the plane, the only way you'll get one is on the used engine market. Current OS offerings are LA (plain bushing, airbleed carb) and AX (ball bearings, twin needle carb).
Thunder Tiger has GP (plain bushing, airbleed carb) and PRO (ball bearings, twin needle carb).

If you want something simple, inexpensive, and new:
OS 46 LA
Thunder Tiger GP42

RE: SIG Mark II Engine ?
 

The Thunder Tiger GP42 has power beyond its specs. It will work fine. A Kadett would be in its element with a .50 -.60 4 stroke. Nice quiet half throttle cruiser.

RE: SIG Mark II Engine ?
 

I just won one of these on E-Bay.. Hope they aren't to hard to break in and tune...?

RE: SIG Mark II Engine ?
 

Manual available here http://manuals.hobbico.com/ttr/gp-series-manual.pdf
It should be super easy, one reason TT engines are highly recommended

RE: SIG Mark II Engine ?
 

I agree with EC121 on the "power beyond its specs" Bill. I've never owned one of the TT GP series, but I've always heard that the GP-42 is a real stump puller. That'll power your Kadet just fine and you will get many years of service out of it. I think this may be a better manual link Carrellh: http://mms.tiger.tw/upload/2007-1-30/20071308357.pdf Your link only goes to the .28 but it's probably all the same info. The guys at the field can help you Bill when you reach that point.

Oh and as for your original post Bill..... I love the OS FP &amp; LA lines. They're easy for someone like me (not an engine guru) to tune and they run forever with a lot of abuse. Disclaimer: Not recommending abuse. :) If you're buying one, go with the .46 because the .40's are discontinued like was mentioned. I've flown a 6 1/2 pound plastic SPAD trainer with a .40LA and aside from a pretty long takeoff run, it flew just fine once in the air. Don't know how much vertical you're going to get out of it, but it flies fine. :) I agree that you're going to get more power out of a ball bearing engine but I've bought a ton of OS FP &amp; LA bushed engines off the internet really cheap and build my planes to somewhat fit the engines because a lot of people say "you're going to get a lot more power out of a ball bearing engine" and sell their perfectly good bushed engines cheap. ;) Have fun!<br type="_moz" />

RE: SIG Mark II Engine ?
 

The LA will do ya just fine...even on grass.....but I would go with thr 46AX if it were me..... The LA series engines do not use Ball bearings....they use bushings instead. My first engine was a 40LA it worked just fine for a long time.

RE: SIG Mark II Engine ?
 

I think he's already gone with a TT GP42.  :)

RE: SIG Mark II Engine ?
 

Yep, I received the TT GP42 in the mail yesterday, same day as my SIG Kadet kit.. So it was a fun day, might just be me, but I love when my items arrive in the mail. Some day I hope for it to be a "New" pinball machine, but that goes on another hobby forum of mine.

I think I did alright as far as price. I got the NIB..TT GP42 with Muffler ,glow plug and manuals for $60 with Free Shipping... Does this sound like a good deal or not?

RE: SIG Mark II Engine ?
 

Bill, if you are happy with everything then it is a good deal.
Back to the LA .40. I was thrilled when I discovered it was discontinued. They are very under powered even compared to the LA .46. I used a lot of the LA .46 engines in my fun fly planes and really like them. I use trainers that are given to me to instruct with, almost every one of them has a LA .40 in them. Complete dogs that can just get a 40 trainer off the ground. While I still had a few of the LA .46 engines under the bench I would replace the 40s with the 46. I'm out of the .46s but I think I have a couple of the 40s still? There are much better engines on the market these days.

RE: SIG Mark II Engine ?
 

Guess I should ask " Would you pay $60 for the TT GP42" ? I'm not sure if I should be happy at that price or not? I mean in my mind, it could always be cheaper and that would make me happier , but may never be an reality.

RE: SIG Mark II Engine ?
 

Yes, that's a good price...much less than an OS 46 LA and it has a metal backplate, not plastic...be happy! Excellent choice for the plane.

RE: SIG Mark II Engine ?
 

i had one on an Eagle II gold berg kit built trainer.... it was sufficient for training but not enough for a well seasoned pilot who just earned his wings

RE: SIG Mark II Engine ?
 

What is "earned his wings" ... Flying Solo or something?

As long as the engine will work with my SIG is all I'm really worried about right now.. I have to learn to fly and would like to spend a limited amount on something I have a really good chance of crashing...
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RE: SIG Mark II Engine ?
 

Yes, "earned his wings" refers to having soloed.

RE: SIG Mark II Engine ?
 

G'day

A friend in my club had a Thunder Tiger GP 42 in a trainer which he used to teach his two sons to fly. I was really impressed at how well it flew the models AND how quiet it was. I think they are a great trainer engine.

I have one I was given but without a carby so I have never been able to run it.

Mike in Oz

RE: SIG Mark II Engine ?
 

That engine will be fine on your trainer Bill and yes you got a good deal on it NIB.  :)

RE: SIG Mark II Engine ?
 

I was thinking of mounting it to my wood saw horse and break it in "out of plane". I assume engines should also be broke in with the prop on, so I guess I need to pick one of these out too.