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Laser engine in a Hangar 9 Carbon cub

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Mark a11/04/2017 19:01:45
321 forum posts
3 photos

I'm toying with the idea of buying a carbon cub but don't want to use a petrol engine. A nice laser would be nice but which one?.

Denis Watkins11/04/2017 19:10:41
3594 forum posts
166 photos

The 80 is more powerful than a 15cc petrol Mark

Jon will be along soon

Mark a11/04/2017 19:29:29
321 forum posts
3 photos
Posted by Denis Watkins on 11/04/2017 19:10:41:

The 80 is more powerful than a 15cc petrol Mark

Jon will be along soon

I have an 80 that I could use Denis but as you say lets see what Jon recommends.

Jon - Laser Engines11/04/2017 20:07:09
4564 forum posts
168 photos

One chap came in and we just managed to shoehorn a 120 in there but I'm not sure it really needs that much power

Mark a11/04/2017 20:45:03
321 forum posts
3 photos
Posted by Jon Harper - Laser Engines on 11/04/2017 20:07:09:

One chap came in and we just managed to shoehorn a 120 in there but I'm not sure it really needs that much power

I was thinking of the 100 Jon the 80 would be ok I think but for a bit of extra grunt the 100 may be the one.

Phil 911/04/2017 21:28:40
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4278 forum posts
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Posted by Mark a on 11/04/2017 20:45:03:
Posted by Jon Harper - Laser Engines on 11/04/2017 20:07:09:

One chap came in and we just managed to shoehorn a 120 in there but I'm not sure it really needs that much power

I was thinking of the 100 Jon the 80 would be ok I think but for a bit of extra grunt the 100 may be the one.

why would you want extra grunt on this model? the 80 is the closest match to the recommended evolution 15cc engine

Phil 911/04/2017 21:37:20
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4278 forum posts
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the extra power might be useful if you added floats maybe?

Mark a11/04/2017 21:42:03
321 forum posts
3 photos
Posted by Phil 9 on 11/04/2017 21:28:40:
Posted by Mark a on 11/04/2017 20:45:03:
Posted by Jon Harper - Laser Engines on 11/04/2017 20:07:09:

One chap came in and we just managed to shoehorn a 120 in there but I'm not sure it really needs that much power

I was thinking of the 100 Jon the 80 would be ok I think but for a bit of extra grunt the 100 may be the one.

why would you want extra grunt on this model? the 80 is the closest match to the recommended evolution 15cc engine

Thats a very valid point Phil and your quite right why would I need the extra power when an 80 would suit the model perfectly.

Jon - Laser Engines11/04/2017 22:23:17
4564 forum posts
168 photos

The engine choice is between the 80 or the 100 for me.

The 80 will give scale piper cub performance but not a lot else, the 100 will give a more sprightly performance but will not be as easy to hide in the cowling as its a smidge taller.

Its a bit tricky as its got a big span but its not a big model, although the weight they quote (over 11lbs) seems a bit excessive. If pushed I would probably use the 100 myself

Mark a12/04/2017 19:27:06
321 forum posts
3 photos
Posted by Jon Harper - Laser Engines on 11/04/2017 22:23:17:

The engine choice is between the 80 or the 100 for me.

The 80 will give scale piper cub performance but not a lot else, the 100 will give a more sprightly performance but will not be as easy to hide in the cowling as its a smidge taller.

Its a bit tricky as its got a big span but its not a big model, although the weight they quote (over 11lbs) seems a bit excessive. If pushed I would probably use the 100 myself

I'll try it with the 80 first and report back.

Jon - Laser Engines13/04/2017 09:08:47
4564 forum posts
168 photos

Sounds like a reasonable plan. I would mount sideways so the tank can stay put, if you mount inverted the tank will need to be lowered

Mark a14/04/2017 15:36:35
321 forum posts
3 photos
Posted by Jon Harper - Laser Engines on 13/04/2017 09:08:47:

Sounds like a reasonable plan. I would mount sideways so the tank can stay put, if you mount inverted the tank will need to be lowered

Will do Jon thanks for the advice.

Mark a30/12/2018 19:07:07
321 forum posts
3 photos

Well after much delay I finally flew my cub for the first time today. The Laser 80 pulled it along just fine with power to spare. Take off was uneventful and no trimming needed but it was a bit windy so we'll see in less windy conditions. All in all a good day.

Chris Walby30/12/2018 20:38:17
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907 forum posts
220 photos

Mark A, Congratulations and can we please have a photo...in the "Powered by Laser gallery" that way if anyone has a spare 80 and need a home, they will have a nice model with a known good setup cheeky

Jon - Laser Engines30/12/2018 23:20:13
4564 forum posts
168 photos

Nice one Mark. Unusual time of year for a maiden but always good to get some air time!

Engine Doctor31/12/2018 10:39:13
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2205 forum posts
20 photos

Just re read all post ! Ignore what I said re different props etc . Pleased your maiden went well.

 

Edited By Engine Doctor on 31/12/2018 10:42:48

Paul Marsh31/12/2018 10:56:32
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3600 forum posts
1004 photos

I had a 15cc petrol - was way underpowered, but put a 20cc petrol and now perfect.

As for glow, a 100 will be great, not sure Laser do a 120, but they do a 100 and would sound better than a 2 stroke, anyway. Just Petrol is cheaper to run, though Lasers are happy with straight fuel...

Jon - Laser Engines31/12/2018 12:01:22
4564 forum posts
168 photos

We dont really recommend straight fuel any more. It works fine but the difference in cost to 5% nitro fuel is really small and the improvement in performance, mostly in cold weather, is worth the small extra cost.

I would be interested to hear how heavy the carbon cub ended up. I always thought 11lbs was a bit much for a model this size. Clearly the 80 is having no bother pulling it along so perhaps its lighter than they claim

Edited By Jon - Laser Engines on 31/12/2018 12:01:44

Paul Marsh31/12/2018 12:09:58
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3600 forum posts
1004 photos

It is quite a heavy model, although slows down, it seems to fly ok in our windy weather. MIne has got 3 batteries in, as it's using a Dual redundancy system and metal gear digital servos (HS5645MG)

Edited By Paul Marsh on 31/12/2018 12:22:42

Jon - Laser Engines31/12/2018 13:02:06
4564 forum posts
168 photos
Posted by Paul Marsh on 31/12/2018 12:09:58:

It is quite a heavy model, although slows down, it seems to fly ok in our windy weather. MIne has got 3 batteries in, as it's using a Dual redundancy system and metal gear digital servos (HS5645MG)

Edited By Paul Marsh on 31/12/2018 12:22:42

yikes! i would use standard servos and a single 4.8v nimh. Why the added beef? Seems seriously overkill for a cub

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