martin collins 1 Posted August 7 Share Posted August 7 (edited) Another one i have bought in a model, runs nicely and is swinging a 14x7 prop, previous owner didn't know what size it was, someone else told me they thought it could be a 90? Any opinions from those that own Lasers would be appreciated. Edited August 7 by martin collins 1 Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted August 8 Share Posted August 8 No marks on them. Take off head and measure bore and stroke ? Jon might be able to tell from pic but its an old engine possibly before his time a Laser. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted August 8 Share Posted August 8 He got his reply on FB, a .90. Quote Link to comment Share on other sites More sharing options...
martin collins 1 Posted August 8 Author Share Posted August 8 Thanks, didn't want to get into stripping the engine 🙂 1 Quote Link to comment Share on other sites More sharing options...
David Davis 2 Posted August 8 Share Posted August 8 It's a 90. It has eleven fins. If it had had it only nine fins it would have been been a 75. I've had one for years which I thought was a 90 until it proved to be a 75. Then I bought a "50" on line. That proved to be a 75 too! Bristol Blenheim anyone? 😉 PS. A 50 has a parallel front bearing housing. Quote Link to comment Share on other sites More sharing options...
martin collins 1 Posted September 5 Author Share Posted September 5 Working on another pre owned model now which has a clean looking Laser engine in it, anyone tell me what size it is? It currently set up with a 14x6 prop on it, the engine looks like it should maybe have something larger on it? Quote Link to comment Share on other sites More sharing options...
David Davis Posted September 5 Share Posted September 5 I think it's either a 70 or an 80, both have the vertical glow plug. one way to tell would be by weighing it. The 70 weighs 580 grammes, the 80 weighs 690 grammes Quote Link to comment Share on other sites More sharing options...
martin collins 1 Posted September 5 Author Share Posted September 5 Ok, thanks for the reply, here is another one, i thought this was a 70 but it has less fins and the are vertical rather than in a bit of a radius like 0ther one. Help with these greatly appreciated......... Quote Link to comment Share on other sites More sharing options...
martin collins 1 Posted September 5 Author Share Posted September 5 I`m `guessing` now that my one in the lower pictures is a 50 as it has the parallel front bearing housing mentioned earlier in the thread and less fins, the one with the red engine mount has a curvature looking at all the fins combined rather than a straight side and 9 fins, this one on Evilbay was advertised as a 70 and has straight fins with one fin less, does that suggest this is an 80? I won`t be taking it out of the model at the moment as i am getting it ready to fly, maybe it is something i will do over the winter and weight it then. Quote Link to comment Share on other sites More sharing options...
martin collins 1 Posted September 5 Author Share Posted September 5 Ok, without removing it from the model to weigh i think it is an 80, i have found several 70 and 80 engines on Ebay completed listings which is a good way of looking at pictures of other Laser engines, both the 70`s had 8 straight fins on the heads and both the 80`s had 9 curved fins, all these engines were vertical plug with the newer style rocker covers with two bolts and the same silencer/carbs as mine. If the engine comes out at some point i will weigh it and post on here for others reference. Quote Link to comment Share on other sites More sharing options...
David Davis Posted September 5 Share Posted September 5 Good Evening Matin, I do not consider myself an expert on identifying Lasers but I'll openly admit to being a Laserholic! 😏 I have eleven of them, to whit: a 50, a 62, three 70s, two 75s, an 80, a 155, a 150V twin and a 160 V twin. I bought two of the 70s, the 155 and the 160V twin brand new. The rest were bought second hand. I have just spent a merry five minutes in my workshop counting the fins on the cylinders of my smaller engines! We have already established that your first engine in the pale blue model is a 90. The engine in the red motor mount appears to be an 80. It has nine fins and a vertical glow plug, furthermore the middle fins on the 80 are larger than those at the top or at the bottom of the cylinder, giving it a shape similar to a beer barrel. I don't think that the engine in the last picture is a 50. The 50s were only made between 1988 and 1990 and were fitted with Super Tigre carburetters, a forward facing glow plug and a smaller silencer. Your engine has a vertical glow plug, an Irvine type carburetter and the later silencer. I'd say that this engine is a 70. Incidentally, while doing my fin counting excercise I noticed that the 62 and the 50 were externally identical so if I wanted to cheat in next year's Coupe Des Barons...😉 Quote Link to comment Share on other sites More sharing options...
martin collins 1 Posted September 5 Author Share Posted September 5 Many thanks for your comprehensive reply David, looking at the Laser website the 70 has 8 fins, the one in the camo plane has 7 and the nose where the bearings sit is parallel which is why i wondered if it was a 50 though i haven`t seen one of those with the newer style rocker cover. I am in the process of removing the engine as that airframe is up for sale as it is one of two DB Bi-Stormers i have and i prefer the scheme on the other one. I intend using the Laser in another model once the size is identified, I will get some more measurements and weight in the next hour once removed. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted September 5 Share Posted September 5 Nice thoughts David. Having been in several competitive sports I have noted, for winners, rules are optional, but be aware of judges. Or as my PE teacher / rugby coach Mr Stewksbury, observed of me coming second, “first loser Fry.” Quote Link to comment Share on other sites More sharing options...
Jon H Posted September 5 Share Posted September 5 4 hours ago, martin collins 1 said: 80, made by me in 2011 3 hours ago, martin collins 1 said: 70. in theory any time after 2006 but i would guess its not more than 10 years old as it looks pretty clean. Quote Link to comment Share on other sites More sharing options...
martin collins 1 Posted September 5 Author Share Posted September 5 (edited) As usual Jon you are spot on, engine now removed, weighed and measurements taken and compared with the info on the Laser website, it checks out as a 70 and it is stamped J14 which i guess is your initial manufactured in 2014 🙂 . So i have a 70 and an 80 to go with the 100 in the Nutten Special, i will be bringing that along for the Laser day at Buckminster and if i can get the 80 powered Broussard broken wing strut mount removed and re made and the model test flown i will also bring that with me. The model with the 90 in was sold with the engine as i had these two newer Lasers to play with and more than enough bipes to keep me happy! Thanks for all your help guys. Edited September 5 by martin collins 1 Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted September 6 Share Posted September 6 Looking forward to seeing them Martin. Quote Link to comment Share on other sites More sharing options...
David Davis Posted September 8 Share Posted September 8 On 05/09/2024 at 18:56, Don Fry said: Nice thoughts David. Having been in several competitive sports I have noted, for winners, rules are optional, but be aware of judges. Or as my PE teacher / rugby coach Mr Stewksbury, observed of me coming second, “first loser Fry.” I believe that someone was disqualified from the 2023 Coupe Des Barons for fielding an oversized engine! Quote Link to comment Share on other sites More sharing options...
Don Fry Posted September 8 Share Posted September 8 2 hours ago, David Davis said: I believe that someone was disqualified from the 2023 Coupe Des Barons for fielding an oversized engine! No, he was disqualified for being CAUGHT with an oversize engine. 1 2 Quote Link to comment Share on other sites More sharing options...
David Davis Posted September 8 Share Posted September 8 I note that the Laser 50 is fully 7ozs heavier than my Thunder Tiger 54. I am starting to have reservations about running a Laser 50 in La Coupe Des Barons. I may usesomething lighter and more expendable! Quote Link to comment Share on other sites More sharing options...
Don Fry Posted September 8 Share Posted September 8 7 hours ago, David Davis said: 7 hours ago, David Davis said: I note that the Laser 50 is fully 7ozs heavier than my Thunder Tiger 54. I am starting to have reservations about running a Laser 50 in La Coupe Des Barons. I may usesomething lighter and more expendable! Both motors are obsolete, no bits available. From bitter experience, the Laser is a far superior lawn dart, far harder steel, important bits behind the cylinder 1 Quote Link to comment Share on other sites More sharing options...
Keith Billinge Posted September 9 Share Posted September 9 I know Laser engines are no longer a thing. But maybe they could have labelled their motors to help the buying public? Seems you need the skills of a detective just to know what you have got. 😁 2 2 Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted September 9 Share Posted September 9 57 minutes ago, Keith Billinge said: I know Laser engines are no longer a thing. But maybe they could have labelled their motors to help the buying public? Seems you need the skills of a detective just to know what you have got. 😁 Or why not come out with a couple of pages with the information on them, ie, number of cooling fins, plug position etc,, or as they had the owner's initials on them, they must know who had what. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted September 9 Share Posted September 9 (edited) Laser no longer exists so that isn’t going to happen. The engines that Jon produced were marked, as he has pointed out on several occasions on this forum so the problem is really the older ones and usually ones that have been bought second hand. Now here’s an interesting thought, why not ask what size is the engine from the seller? Failing that you are gambling on not only the size of engine but also its (internal) condition. You pays your money etc etc. On the subject of information, didn’t Jon produce a list of bearings for various engines? For the life of me I can’t find it! Edited September 9 by Ron Gray Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted September 9 Share Posted September 9 8 minutes ago, Ron Gray said: why not ask what size is the engine from the seller? They have usually passed hand to hand a few times, so they can't remember what they were, but the sales bills from laser must be somewhere. Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted September 9 Share Posted September 9 What, you expect someone to go through the paperwork of a now defunct entity to find information for a lump of metal worth, on average circa £100? 2 Quote Link to comment Share on other sites More sharing options...
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