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Laser Engines - Technical questions

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Jon - Laser Engines20/11/2019 16:16:57
4894 forum posts
186 photos
Posted by Martin McIntosh on 20/11/2019 15:28:30:

Jon, I have a pair of Eurokits air units, 90 degrees and ex Lanc. if you are interested. Same as the ones in my 1:5 Hurricane.

Thanks Martin

I found some robart jobs 2nd hand in the end but its a shame we lost people like eurokit as they did some nice stuff at decent prices

Bob Cotsford20/11/2019 16:28:59
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8062 forum posts
444 photos

Jon, did you ever try any of the Lado electric units? Very well made substantial units in sizes to suit anything over 5kg with larger sizes to suit 50cc machines. Unfortunately they seem to have disappeared, maybe not enough people actually prepared to pay for quality in the face of cheap units from HK?

Jon - Laser Engines20/11/2019 19:50:57
4894 forum posts
186 photos

never tried them but as you say, lado are gonners

bert baker20/11/2019 20:48:06
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1482 forum posts
305 photos

Off topic,?

I do like Laser engines but

Martin Harris20/11/2019 23:18:54
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8951 forum posts
221 photos

Posted by Jon - Laser Engines on 20/11/2019 16:16:57:

I found some robart jobs 2nd hand in the end but its a shame we lost people like eurokit as they did some nice stuff at decent prices

Lost - or just not being distributed?

Edited By Martin Harris on 20/11/2019 23:21:41

Martin McIntosh21/11/2019 09:01:44
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2970 forum posts
1090 photos

Nice to know that they could still be around.

Ron Gray21/11/2019 09:09:10
1550 forum posts
367 photos

Their air retracts look to be good value as well.

Jon - Laser Engines21/11/2019 11:27:41
4894 forum posts
186 photos

Not that i am opposed to the chat but we should probably bring this back to technical things. We could start another thread to cover the search for retracts if we like

One quick question i would like feedback on.

A new multi cylinder engine of about 50cc and intended to fit 80-90 inch span WWII fighters with inline engines (Spitfire Mustang etc) without hanging out of the cowl. It would be glow but 5% nitro and with a low oil requirement. I estimate 8-10 flights of 10 minutes per gallon on glow fuel from a fuel consumption point of view.

Would you buy one or would it have to be petrol at that capacity even if making it petrol made it significantly more expensive?

Place your votes please.

Dirk Witvrouwen 121/11/2019 11:46:49
4 forum posts

I would not buy 50cc methanol. I'd prefer you to spend research resources in workable petrol design.  As side note, ever considered E100 engines? 

Edited By Dirk Witvrouwen 1 on 21/11/2019 11:48:44

Steve Dunne21/11/2019 12:00:03
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123 forum posts
53 photos

I'd definitely go for glow, petrol is not an acceptable option to SWMBO.

Lack of larger glow engines and the size of the trapdoor into my loft workshop are the two factors that have limited me to around 80" warbirds and other models.

Steve.

Jon - Laser Engines21/11/2019 12:05:04
4894 forum posts
186 photos

Dirk - Why would you use ethanol but not methanol? Both cost more or less the same and the engine would use them in similar quantities so there would be no fuel cost advantage. I dont believe you can use a glow plug with ethanol so you would need an ignition unit and this would make the engine more expensive than a glow to begin with. Ethanol is more difficult to get as well, at least it seems to be here in the uk.

Also, what would put you off the engine on normal methanol fuel in the first place? Im a little confused!

Steve, good to know. The engines i have in mind are (somewhat selfishly) designed in part around my own needs for engines to fit DB Hurricane/Spitfire, 1/5 scale P40 and Spitfire etc. The concept of one of the designs however could shrink down to a 160-200 size though for models like your YT spit and Hurricane. 

This is all hypothetical right now, but a glow version would be much easier to produce if i got the chance. 

 

 

 

 

Edited By Jon - Laser Engines on 21/11/2019 12:08:55

Martin Harris21/11/2019 12:09:09
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8951 forum posts
221 photos

I'm not in the market for one at this time so my viewpoint may not be relevant but my preference would be glow. If we look at it no more than £2 a flight for fuel then the additional cost for a petrol version would go a long way to subsidising the additional fuel costs.

I would want to keep my model indoors and petrol is a no-no for that.

bert baker21/11/2019 12:20:53
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1482 forum posts
305 photos

I have a 7-70 radial on glow,,,, I have a complete petrol conversion kit ready to fit to it

its not the fuel consumption that I have issues with it’s the reliability.

trying to keep seven glow plugs happy is a pain,,

Even with onboard glow it can’t overcome a oiled up plug during flight.

the more significant thing is internal corrosion,,,

I am hoping spark ignition will keep all the cylinders alive..

if only Jon’s management would support his dreams

SR 7121/11/2019 12:25:50
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299 forum posts
62 photos

For me it would have to be petrol, cleaner and has been pointed out keeping the plugs alight on a glow is not easy on the ones iv seen

Tony

Dirk Witvrouwen 121/11/2019 12:25:58
4 forum posts
Posted by Jon - Laser Engines on 21/11/2019 12:05:04:

Dirk - Why would you use ethanol but not methanol? Both cost more or less the same and the engine would use them in similar quantities so there would be no fuel cost advantage. I dont believe you can use a glow plug with ethanol so you would need an ignition unit and this would make the engine more expensive than a glow to begin with. Ethanol is more difficult to get as well, at least it seems to be here in the uk.

Also, what would put you off the engine on normal methanol fuel in the first place? Im a little confused!

Steve, good to know. The engines i have in mind are (somewhat selfishly) designed in part around my own needs for engines to fit DB Hurricane/Spitfire, 1/5 scale P40 and Spitfire etc. The concept of one of the designs however could shrink down to a 160-200 size though for models like your YT spit and Hurricane.

This is all hypothetical right now, but a glow version would be much easier to produce if i got the chance.

Edited By Jon - Laser Engines on 21/11/2019 12:08:55

In Belgium Methanol can't be sold over the counter anymore, thus, almost impossible to mix your own fuel and local hobby shops are getting extinct and/or do not carry nitro-less fuel etc...

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I would have no objection against having to use an ignition system on a larger Laser. It is an extra point of failure though.... and so far I've been an electrics only guy so all of this may not make much sence.
Ethanol is less toxic as methanol (far from an expert on that matter), and since I encountered an online shop selling E100....I simply raised the question coming in with a blanc sheet.
 
My position still stands that I would not buy a 50cc methnol for reason of fuel accessibilty and fuel cost difference with petrol
SR 7121/11/2019 12:27:19
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299 forum posts
62 photos

And i have the plane ready and waiting for it nerd

Richard Wills 221/11/2019 12:27:55
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184 forum posts
7 photos

A 50 ish cc inline glow I would really like, even more so if it ended up 60cc ish. Been looking for a long time for something like that suitable for a 1/5 Mustang.

maurice northcott21/11/2019 12:28:25
92 forum posts
63 photos

Yes please Jon, nice new large Glow Engine. Oh and can we please have a few of the out-of-manufacture vee's please?

Alan Hilton21/11/2019 12:34:01
109 forum posts

Hi Jon

Yes please for a 50 cc engine ,I wouldn’t buy a petrol ,I prefer the simplicity of glow any day

Alan

David P Williams21/11/2019 12:42:53
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862 forum posts
282 photos

Yes please Jon. I have an unbuilt Top Flite Giant Scale 1/5 Mustang kit in the loft waiting for exactly this engine.

Glow for me - the smell of petrol in the car and workshop makes me feel sick, so I would have to run a petrol engine on Aspen which would negate any fuel cost savings. I don't fly that much anyway, more of a builder than flyer, so fuel costs don't bother me. Never have a problem with any of my glow engines, including the cheap ones, as they're all tuned correctly. Can't remember the last time I had a deadstick, including the twins.

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