By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

Laser Engines - Technical questions

All Topics | Latest Posts

Search for:  in Thread Title in  
Chris Walby02/01/2019 11:15:55
avatar
1468 forum posts
399 photos

Denis,

You mean they don't last forever.... I'll try a new one and see what happens, but I suspect it might be on its way out and an easy swap to see if it makes a difference.

Jon - Laser Engines02/01/2019 11:16:04
5763 forum posts
275 photos
Posted by J D 8 on 01/01/2019 22:05:43:

I had an Enya that needed a scarf on a cold day. The only way it would fly properly at low temps was to tie a rag around the base of the cylinder!

My enya 53 is not a fan of being cold. If i give it the big one too soon after starting it there is a long bang and the prop shoots over the horizon. It demands a good 30-40 seconds at over 1/3 throttle to get it warm enough to be happy at full power.

Chris, i think the weekend is going to be a bit nippy so the gloves will come in handy!

Rocker03/01/2019 20:16:35
359 forum posts

A person in our club is building a Seagull Stuka (90 inch ) he has 50 cc petrol engine to put in the Stuka .Just a thought anyone tell me if the Laser 180 would be powerful enough to fly the Stuka .I know Seagull recommend a 50 cc petrol engine for the Stuka,I know the Laser 180 is not a 50cc engine but sometimes the manafactures over power there models ( a good example is the Seagull Gipsy Moth ,Seagull recommend a 120.4 stoke for the Gypsy Moth and I fly it on a Laser 80 and it is perfect )I I have always like the Stuka but I do not like big 2 stroke petrol engines .To noisy for me much prefer the sound of a Laser 4 stroke and what with the Laser twin not being in production at the moment just thought if a Laser 180 would do the job but I think I might be asking a bit to much from the Laser 180 ?

Edited By Rocker on 03/01/2019 20:18:29

Martin McIntosh03/01/2019 20:42:57
avatar
3718 forum posts
1296 photos

In my opinion you really would be asking too much here. My 180 powers a rather heavy (18lbs) 72" Spitfire and is just right for this. An 18" prop would also look rather silly on yours. My 96" Hurricane is adequately powered by a 50cc petrol and as you say the noise is unacceptable. I recently re engined an Extra 540 at 2m span from 52cc petrol to a 30 but this is a very light model indeed. Just be patient and hang out there for a Laser twin.

Jon - Laser Engines03/01/2019 21:03:07
5763 forum posts
275 photos

Rocker it will come down to two factors:

1. The actual flying weight (the quoted 17lbs is suspiciously light)
2. Your performance expectation for the model.

If we assume a likely weight of 20lbs then the 180 will fly the Stuka and will give it scale performance. By that i mean it will have the performance of a heavily laden ground attack aircraft. It will not fly like a fighter.

If you are prepared to fly the stuka as a stuka, and run the 180 for maximum thrust (use 20x6 prop) then i do not think you will have any trouble.

If however you want a more dynamic model with a performance that is more than scale then you will need more power.

To give an idea of the performance available from the 180 we have several in 80'' span Hurricanes from YT and seagull. The seagull version is just shy of 18lbs and the YT version about 20. Both fly well on 180's in the 2/3-3/4 throttle area for scale performance. I also used the 180 in my 80'' La7 of 19lbs and it flew fine. I have since changed the engine in the la7 but only because the 180 did not give the vertical performance i wanted for a 1944 fighter.

Beyond that my stampe is light at 16lbs but has quite a bit of drag from an effective 160'' wingspan. 1/2 throttle is all i need here.

So while i understand Martin's hesitation i personally think it will work as long as you are happy to fly the Stuka as a Stuka and not pretend its a 109

Martin McIntosh03/01/2019 21:06:54
avatar
3718 forum posts
1296 photos

Fair comment Jon.

Rocker03/01/2019 21:53:37
359 forum posts

Thanks that has answer my question

Jon - Laser Engines03/01/2019 23:20:46
5763 forum posts
275 photos

No worries.

If you have never seen the stuka they have at Hendon i think you should go take a look. I was staggered just how big they are and understand fully why its rate of climb was worse than a tiger moth at less than 500ft/min. For comparison, a Hurricane climbs at up to 2800ft/min and that was nothing compared to the 109 and other later fighters.

I am very keen to see the restored example they have in the US fly again in the not too distant future.

Andy Shailer04/01/2019 16:15:57
avatar
389 forum posts
406 photos
Hi all, firstly apologies for a silly question, l have two Laser engines both look same size, one l believe is a 120 the other a 150, no markings on both to say what is what, silly question time.....would the 150 be heavier then the 120, many thanks for any info.
Andy.
Manish Chandrayan04/01/2019 17:19:36
avatar
670 forum posts
75 photos
Andy, logically the 150 should be heavier than the 120. Why not post pictures of both? That should make things easier
Andy Shailer04/01/2019 17:35:00
avatar
389 forum posts
406 photos
Just trying to work out how to on my phone as no lap top
Andy
Jon - Laser Engines04/01/2019 20:09:45
5763 forum posts
275 photos

Its not a silly question, in fact its pretty common. Assuming you can beat the tech into submission then some photos are all we need for an ID

you will happy to hear all current engines come with the size on them

Andy Shailer04/01/2019 20:14:43
avatar
389 forum posts
406 photos

20190104_173242.jpg

20190104_173236.jpg20190104_173231.jpg20190104_173311.jpg20190104_173317.jpg

Andy Shailer04/01/2019 20:17:14
avatar
389 forum posts
406 photos

Hi Jon, sorry l couldn't rotate pictures

Jon - Laser Engines04/01/2019 21:18:16
5763 forum posts
275 photos

No problem Andy. The taller engine with the square rocker cover is a 1998 vintage 150. The shorter engine is a 2000 vintage 120.

Both are still supported for spares and service.

Andy Shailer04/01/2019 21:59:57
avatar
389 forum posts
406 photos
Brilliant, Big thank you Jon, 120 going in sig 1/4 Spacewalker and hopefully the 150 powerful enough for precedent 1/3 Druine Turbulent, many thanks for info Jon.
Regards
Andy.

Edited By Andy Shailer on 04/01/2019 22:00:21

Jon - Laser Engines05/01/2019 09:34:30
5763 forum posts
275 photos

The 120 will be fine in the spacewalker as long as its not too heavy.

The seagull artf version is very light and will be fine with the 120. The SIG kit built version on the other hand is heavier and will be better with the 150. Also remember that our 120 is a short stroke engine and it likes to rev a bit more than our other engines do. On something like a 15x8 expect low-mid 8000's depending on the prop/fuel combo. Dont be tempted to load the engine with a prop that runs it at less than about 8000rpm on the ground. It just wont like it.

The Turbulent is a similar story as the 150 will fly it fine but we often recommend the 180 as a bigger prop can be used and you have a margin of spare power should you get into trouble. The 150 can be loaded as low as 7500rpm without too much distress and the 180 is ok down to about 6500. This would be on 18x6 and 20x6 props respectively

The Hobbit05/01/2019 16:56:08
4 forum posts

I would like to put a Laser in a Black Horse Sea Fury .I have a Laser 80 and a Laser 180 .I think the Laser 80 will not power the Black Horse 20cc Sea Fury so was thinking on the Sea Fury 45 but will the Laser 80 be to much for the Sea Fury 45 and not powerful enough for the Sea Fury 20cc On to the Laser 180 will this power the bigger Black Horse Sea Fury 30cc .My question is would the Laser 80 power the Sea Fury 20cc size or would I be better using the Laser 180 in the bigger Sea Fury or am I doomed to none of the Sea Fury being suitably for the Black Horse Sea Fury ??

The Hobbit05/01/2019 17:05:12
4 forum posts

My dad use to fly the Sea Fury many years a go ,So I would like to have a Black Horse Sea Fury .I have a Laser 80 and a Laser 180 but I am not sure which Sea Fury would be the best combination .The Laser 80 I think would not have enough power for the Sea Fury 20cc and would be overpowering the Sea Fury 45 . Now would the Laser 180 be enough to power the bigger 30cc Black Horse Sea Fury or not .I am doomed and will I have to buy a different engine say a Laser 120 for the 20cc Sea Fury ?

Jon - Laser Engines05/01/2019 17:07:23
5763 forum posts
275 photos

I have been asked about 1000 times what type of remote glow lead i recommend for our engines as the normal rubber boot type dont fit the smaller engines that well.

So, the type i now recommend are these jobbies (link below) and they are readily available. Intended for cars, but one of my intrepid customers took a punt and fitted a pair to his 200v so that he didnt have to chop the cowling about. He assures me they work, so blame him if it all goes wrong

**LINK**

All Topics | Latest Posts

Please login to post a reply.

Latest Forum Posts
Support Our Partners
CML
Slec
Sussex Model Centre
Jetworks
Subscribe now
electricwingman 2017
Sarik
Advertise With Us
Latest "For Sale" Ads
NEW POLL - has the pandemic altered your event safety perceptions?
Q: Has the covid pandemic deterred you from attending shows and events in 2021?

 No, I'll be attending just as many as I usually do
 No, but I'll choose my event with greater care
 Yes, I'll attend fewer events going forward
 Yes, I wont attend any where previously I have

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E!