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Laser Engines - Technical questions

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Rob Tothill03/09/2018 22:32:14
111 forum posts
8 photos
Thanks Jon,
It is an APC.

Should there be a gasket for the rocker cover? It doesn't have one and seems to be leaking a bit of oil. I'm not bothered about the dripping oil if it won't cause any problems.
Ron Gray03/09/2018 22:44:48
2154 forum posts
937 photos

@Manish- did you try opening the low needle a bit?

Jon - Laser Engines03/09/2018 23:54:34
5499 forum posts
268 photos
Posted by Rob Tothill on 03/09/2018 22:32:14:
Thanks Jon,
It is an APC.

Should there be a gasket for the rocker cover? It doesn't have one and seems to be leaking a bit of oil. I'm not bothered about the dripping oil if it won't cause any problems.

it should seal on its own but if not clean it all with meths and give it a little wipe of silicone sealer

Manish Chandrayan04/09/2018 12:57:45
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638 forum posts
73 photos

"Manish, to be honest im not sure. It could be fuel draw, could be turbulence, could be your fuel or something else. If its over revving i would expect it to behave as you describe..there's loads of reasons. Its not something i have ever noticed and if it runs fine in the air then dont worry about it. I would have test run the engine before i sent it so if something was wrong i would have seen it."

The engine was bought back in 2012 but started running it in recently. Did not seem to be over revving (did not have a tacho that day) Yet to put it in air, will see, how and what it does

 

Edited By Manish Chandrayan on 04/09/2018 12:58:04

Manish Chandrayan04/09/2018 13:01:54
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638 forum posts
73 photos
Posted by Ron Gray on 03/09/2018 22:44:48:

@Manish- did you try opening the low needle a bit?

Yes, I tried richening and leaning the low end needle but it did not have any effect on the issue

Rob Tothill05/09/2018 20:17:53
111 forum posts
8 photos
Thanks Jon. I'll give it a polish and try again.
Ron Gray10/09/2018 13:23:44
2154 forum posts
937 photos

Has anyone tried running a Laser with a flexi exhaust in place of the standard silencer, and if so what was the noise like? The reason for asking is because I have a 100 that I want to fit to a new build (Seagull Radial Rocket) and the flexi exhaust would be a better fit than the standard silencer.

Alan Hilton11/09/2018 08:53:23
128 forum posts

Hi Ron

I have two v twins on flexeible exhaust both run well but they are louder than standard item . Our site isn’t noise sensitive and the do sound nice ,a bit like a Harley Davidson

Alan

Ron Gray11/09/2018 09:00:33
2154 forum posts
937 photos

Thanks for that Alan. We don't have a noise restriction, as such, on our site but we do have to be aware of noise and try and keep it to a minimum. I'm currently running another 100 in another 'plane and that, with the standard silencer, is very quiet so I'm hoping that the noise increase with the flexi pipe won't be too bad. Having said that, I will be running smaller prop (for speed) and to a certain extent I want a bit of noise, after all, it is a Reno Racer! If it proves to be too much I could always make up an adapter and fit the silencer to the end of the flexi pipe.

Alan Hilton11/09/2018 19:41:47
128 forum posts

Hi Ron

Mick Reeves does Laser fit flexible pipe which works well .He also does a silencer which fits the flexible .I haven’t tried the silencer but it must reduce the noise and may be worth a go

Alan

Ron Gray13/09/2018 18:21:03
2154 forum posts
937 photos

Took the Radial Rocket to the field today for its maiden flight. I was little bit apprehensive about the engine exhaust arrangement, with no silencer I was concerned that it may produce too much noise. I needn't haven't worried, even without the silence the noise level was more than acceptable and the exhaust note was very pleasant, a colleague commented that at half throttle it sounded like the real thing! So a big smile on my face then, next up is to change the prop from a 14x6 to a 13x7 to see what difference that makes, although the 14x6 does propel it along at a fair old lick.

Chris Walby21/09/2018 21:54:40
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1237 forum posts
303 photos

Jon,

Finished the Acrowot Laser build and was going to fly it without the cowl, then realised I need to get it noise tested so fitted the cowl, but then remembered I have attached the forward facing tank vent to the lower engine mount.

As this is now inside the cowl will it be an issue? There are a couple of large holes in the front of the cowl to let air or does the vent really need to be outside and in the airflow?

Cheers Chris

Jon - Laser Engines21/09/2018 23:28:14
5499 forum posts
268 photos

the biggest problem is that it will fill the cowl with fuel as it is the vent line for filling the tank. beyond that it will probably be ok but it wont work as well as it would if it were dangling in the breeze

Chris Walby22/09/2018 04:11:06
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1237 forum posts
303 photos

Jon,

Good point about filling as I fill via the carb line and just watch the vent line to ensure my counting in (and later out/refill) is right until full.

I'll move it to the outside and then I'll never need to go in the cowl again!

PS I don't let any of the tank vent lines dangle in the breeze as I thought the "preferred option" was forward facing to give a little positive pressure?

On a different subject regarding inverted Lasers, I plumbed the crankcase vent down like the horizontal installations. In your experience does oil come out of the vent line? or could it just be directed upwards and just act as a air vent?

Cheers

Chris Walby22/09/2018 07:53:05
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1237 forum posts
303 photos

Thought I would take a photo and now I am not so sure....!

20180922_071436.jpg

Manish Chandrayan22/09/2018 07:57:55
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638 forum posts
73 photos
Chris if that's the tank vent I don't see any issues.
But if that's the crank case vent I see the cowl and firewall getting a nice coat of used lube
bert baker22/09/2018 09:45:48
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1609 forum posts
331 photos

This is a great example of how it should be done,,,,not done by me but came on a Old sopwith pup,,, it’s a Laser 180,

Tank vent is in forward facing position in flow of prop wash,waste crank vent oil is collected in a Old pill tub,camera film containers work well.4f6b7c60-eb6b-4cad-9c96-59e7ecaeaa98.jpeg

bert baker22/09/2018 09:45:50
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1609 forum posts
331 photos

It is over propped but runs superb...even being over propped it runs so sweet,, it has never missed a beat or cut out

Edited By bert baker on 22/09/2018 09:52:19

cymaz22/09/2018 10:02:31
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9251 forum posts
1195 photos
Posted by bert baker on 22/09/2018 09:45:50:

It is over propped but runs superb...even being over propped it runs so sweet,, it has never missed a beat or cut out

Edited By bert baker on 22/09/2018 09:52:19

You can hear the engine above the pilot shouting, “attack, attack, attack....ratatatatat” laugh

Jon - Laser Engines22/09/2018 11:19:06
5499 forum posts
268 photos

Chris i recommend you glue a small wooden block inside the cowl and then drill through it. The pipe can then be glued into the block. Its quick and really simple, just make sure you dont kneel too close when filling or you may end up with a lap full of fuel!

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