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Laser Engines - Technical questions

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Jon - Laser Engines25/03/2020 16:41:35
5422 forum posts
263 photos

they are quite economical if tuned up nicely and run on the right fuel. I think i had a 14oz in my stampe and it was certainly good for at least 25 minutes as i flew that long on a number of occasions and still had some left.

kevin b25/03/2020 17:30:37
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1823 forum posts
145 photos

Slightly off topic, but I think Jon should self isolate at the workshop, whilst all the other staff are off. He will be able to use the machinery to turn out lots of lovely new engines !

wink 2

Keith England 125/03/2020 17:41:00
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15 forum posts
Posted by kevin b on 25/03/2020 17:30:37:

Slightly off topic, but I think Jon should self isolate at the workshop, whilst all the other staff are off. He will be able to use the machinery to turn out lots of lovely new engines !

wink 2

He looks like he is doing pretty well as it is 🤓

Jon - Laser Engines26/03/2020 08:13:51
5422 forum posts
263 photos
Posted by kevin b on 25/03/2020 17:30:37:

Slightly off topic, but I think Jon should self isolate at the workshop, whilst all the other staff are off. He will be able to use the machinery to turn out lots of lovely new engines !

wink 2

Its a nice idea but i need the others to run the machines. Also, if supplies of ali and steel continue to decline we will all be twiddling our thumbs anyway

Bucksboy02/04/2020 17:19:28
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575 forum posts
109 photos

Jon,

I started this Brian Taylor Bf109 about 5 years ago but then work got in the way. Its 3/4 built but I'm afraid to say I totally ignored your advice about tank height. I've followed his instructions and placed the tank where he suggested. Underneath the tank is the flight battery and the throttle servo. So now I've got time to advance the plane but I've looked again at the tank position.

Moving the tank would be very hard.

I could try turning the engine upright but fear it would poke out the top of the cowl.

Or, I could leave it as. The height difference is about 4", what would happen if I left it like it is?

The picture shows the approx. tank feed and the carb inlet with the two short red lines.

The curved lines top and bottom is the approx. cowl position.

img_0134.jpeg

What to do? Thanks

Bucks

Nigel R02/04/2020 17:30:52
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3744 forum posts
586 photos

Have you space to squeeze a tiny tank, say 2oz, at the correct height? If so you could do a chicken hopper set up.

Steve Dunne I believe has one in a Spit.

There was a thread on them here:

**LINK**

Jon - Laser Engines02/04/2020 17:35:06
5422 forum posts
263 photos
Posted by Bucksboy on 02/04/2020 17:19:28:

 

Or, I could leave it as. The height difference is about 4", what would happen if I left it like it is?

 

 

It will stop whenever you go upside down, which is not ideal.

That angled plate behind the engine at the bottom of the fuselage, what lives in there? I would be tempted to just chop through that angled plate and stuff the tank in there.

Also what size tank are you trying to use? even 10oz would probably do if space is tight. No need to fit a bucket

109 tank.jpg

Edited By Jon - Laser Engines on 02/04/2020 17:37:48

Nigel R02/04/2020 17:43:14
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3744 forum posts
586 photos

There'll be lumps coming out the wing if the tank goes there, that bay looks quite short. Not an impossible bit of woodwork though.

Martin McIntosh02/04/2020 19:03:17
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3329 forum posts
1178 photos

From my experience with two Spits and a Stampe, all flown with Laser 180`s you should have no problem considering that inverted flight with the 109 is only likely to be brief. My Stampe does have a double tank set up (not chicken hopper) with a 9 at the top and a 6 underneath it so the effective fuel head is the 9oz and it will fly inverted all day.

Bucksboy02/04/2020 20:17:52
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575 forum posts
109 photos

It looks like the saw is coming out tomorrow then. Thanks for the advice gents, I’ll just have to summon up the courage and set to. Of course the answer I wanted was ‘not a problem, don’t worry about it’. Still, there are bigger problems than this so I’ll crack on with it.

Thank you, I’ll post some more pictures when surgery is complete. 😄

kevin b02/04/2020 22:25:17
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1823 forum posts
145 photos
Posted by Jon - Laser Engines on 26/03/2020 08:13:51:

Its a nice idea but i need the others to run the machines. Also, if supplies of ali and steel continue to decline we will all be twiddling our thumbs anyway

Ah, plenty of time for development work then. yes

On a slightly more serious note, Some time ago I bought a cheap Chinese petrol strimmer to play with the engine. It has a copy (?) of the Honda 26cc OHC engine fitted to it (maybe I will have time now !). The question I ask, is why model engine manufacturers haven't developed OHC engines ? The advantages are obvious, but I assume there must be some disadvantages otherwise we would be seeing them. Particularly petrol versions.

Now there's a thought. An inline twin Laser with double overhead cams (One has to dream).

teeth 2

Jon - Laser Engines02/04/2020 23:07:52
5422 forum posts
263 photos

OHC engines are too tall

As for an inline twin i already have 3 drawn up are ready to manufacture as well as 3 other things.

Not that it matters, the drawings for my radial were finished about 8 years ago and nothing has been done

SR 7103/04/2020 00:50:15
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433 forum posts
140 photos

If i win the lottery Jon we will set you up to produce your dreams yes

Jon - Laser Engines03/04/2020 08:27:33
5422 forum posts
263 photos

Sounds like a plan.

Radials for all!

I also think one of the first things i would do is make a reduction drive. Get propeller rpm down for much reduced noise. I already have the design done. It would fit our 100, 120, 150,155,160v, 200v, 240v and 300v with only one component change needed per engine and would allow a 200v to swing something like 22x14 3 blade or 24x14 2 blade at a gentle 4400rpm on the prop. Loads of thrust, nice and quiet.

Oh yes, it also would not make the engine more than a few mm longer than it currently is, and could be retrofitted to old engines.

Would be kinda cool i think.

I best keep dreaming.

Dirk Witvrouwen 103/04/2020 09:36:16
6 forum posts

And Jon, don't forget a stylish back-mouted integrated starter for the radial 😁

Jon - Laser Engines03/04/2020 10:39:13
5422 forum posts
263 photos
Posted by Dirk Witvrouwen 1 on 03/04/2020 09:36:16:

And Jon, don't forget a stylish back-mouted integrated starter for the radial 😁

No room for that, the supercharger and fuel pump are in the way. Its dead weight anyway

Nigel R03/04/2020 10:47:35
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3744 forum posts
586 photos
Posted by Jon - Laser Engines on 03/04/2020 10:39:13:
fuel pump

sounded suspiciously like you said "fuel pump" there Jon!? devil

Jon - Laser Engines03/04/2020 11:25:35
5422 forum posts
263 photos

yea the pump will need to sit on the back of the case in a petrol version. I would be happy with a glow prototype for now though.

Chris Walby03/04/2020 11:29:54
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1199 forum posts
299 photos

Well a reduction drive would get my vote as the future will hold only more noise restrictions.

A radial you say, very nice. Mind you getting a numpty like me to get one cylinder set up correctly is a challenge, a twin an outside chance. Now a radial it would best be to fit anti-tamper on all the carb screws or make every owner attend an anti-numpty training class.

Then again a nice inline twin for those long nose warbirds is an idea. smiley

Andy Shailer03/04/2020 11:39:15
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377 forum posts
401 photos

Hi all, can someone explain and show a picture of the fuel tank set up please for a laser 150, Ive never set one up before, on other engines I always used 3 vents, one to the carb, one to exhaust and the 3rd being the filler, do I simply block the exhaust line, sorry if this is a daft question.

Thankyou in advance.

Andy

P.S Im only stating a 150 as thats what Im going to be using, any size laser tank set info will be grateful

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