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Laser Engines - Technical questions

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Jon - Laser Engines25/04/2018 23:57:37
3686 forum posts
146 photos

Trebor, the only biscuit I would entertain would be a choc chip hobnob so don't you worry. Just don't take any of mine or else I will set about you with a chipped APC propeller!

The build a bear notion amuses me greatly. A whole group of guys trying to get their cams in the right place and a line at the test bench to see who's ran the best (or at all ). Its one of those things that would actually be really fun to do but alas its not within the marketing budget I'm afraid.

Unless I lied and just used you all as slave labour to build carburettors and fit valve collets...hmmm I wonder....

Thanks all for the naming input. I have not really made up my mind yet but am leaning towards something with a G in it. TO be honest I somewhat echo the sentiments already recorded on the thread. I don't really care as long as I have the darn thing finished and available for sale.

Manish Chandrayan26/04/2018 04:00:45
397 forum posts
56 photos
Yes Jon, the priority should be to get it tested and available for customers and no stock of either glow or the upcoming petrol isn't doing any good for customers or for AGC Sales
trebor26/04/2018 06:18:29
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1515 forum posts
181 photos

There’s no way I’m being given the valve collet job, I wouldn’t have any hair left by the end of the day. You would end up short as most would be on the floor.

cymaz26/04/2018 06:20:26
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7539 forum posts
975 photos
Posted by trebor on 26/04/2018 06:18:29:

There’s no way I’m being given the valve collet job, I wouldn’t have any hair left by the end of the day. You would end up short as most would be on the floor.

Are you sure all the collets would be on the floor ? laugh

TartanMac27/04/2018 14:06:25
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219 forum posts
142 photos

I was just wondering if I were to buy the 1.55 glow engine or maybe that pumped glow version you mentioned a while back. Would it be possible to convert the engine to the petrol version later on and if so would it cost a lot to do so ?

Denis Watkins27/04/2018 14:16:34
2671 forum posts
136 photos
Posted by TartanMac on 27/04/2018 14:06:25:

I was just wondering if I were to buy the 1.55 glow engine or maybe that pumped glow version you mentioned a while back. Would it be possible to convert the engine to the petrol version later on and if so would it cost a lot to do so ?

Rather than force petrol through the wrong compression ratio, in the wrong combustion chamber, a have to buy new new carb

Why not buy a petrol motor Tartan, they are cheaper

Jon - Laser Engines27/04/2018 16:33:32
3686 forum posts
146 photos
Posted by TartanMac on 27/04/2018 14:06:25:

I was just wondering if I were to buy the 1.55 glow engine or maybe that pumped glow version you mentioned a while back. Would it be possible to convert the engine to the petrol version later on and if so would it cost a lot to do so ?

in principal you could, but as the pumped glow is not really something we are intending to sell at the moment you might not be able to buy the base engine for your plan. Also, even if you did you would still need a new carb, crankshaft, prop driver, driver collet and front housing as well as all the cdi unit parts.

If you bought the standard glow you would also need a new pinion drive, backplate, pump and regulator on top of the parts listed above. long story short, its not cost effective.

To touch on Denis's comment the comp ratio and other aspects of the combustion chamber are unchanged from the glow engine (dont ask me the number, i cant remember) as we have not had any trouble with knocking through all of our testing. This is likely due to our engines having reasonably conservative c/r in the first place and the design of our combustion chamber is resistant to knock even when running on glow. Thats why we dont supply a locknut as its simply not needed.

Edited By Jon - Laser Engines on 27/04/2018 16:34:09

David Ovenden16/05/2018 18:22:55
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299 forum posts
8 photos

Can Jon, or anyone else, give me dimensions of the Laser 200V twin engine. Better still, where I can download a dimensioned drawing of the latest model 200V?

Terry Walters16/05/2018 19:45:21
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1829 forum posts
1068 photos

This might help David. Try http://www.modelflying.co.uk/albums/member_album.asp?a=39698

Terry Walters16/05/2018 19:49:13
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1829 forum posts
1068 photos

This is where I found it.

**LINK**

Terry Walters16/05/2018 19:50:16
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1829 forum posts
1068 photos

Or I could measure mine if you let me know the critical dimensions for you.

Jon - Laser Engines16/05/2018 21:27:58
3686 forum posts
146 photos

Nice one Terry. I don't have a proper dimension drawing yet. its another thing on my list of things to do

David Ovenden17/05/2018 21:10:42
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299 forum posts
8 photos
Posted by Terry Walters on 16/05/2018 19:50:16:

Or I could measure mine if you let me know the critical dimensions for you.

Terry thanks for the info you sent me. Nice engine but not sure it will fit the model without a lot of mods.

john stones 117/05/2018 21:38:15
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9252 forum posts
1419 photos
Posted by Terry Walters on 16/05/2018 19:50:16:

Or I could measure mine if you let me know the critical dimensions for you.

You flying with the Doncaster flying club Terry ?

John Stainforth17/05/2018 21:41:52
187 forum posts
38 photos

David,

I have a Rhino 3D model of the Laser 200V, which I used for my Supermarine S6b model. The representation of the cylinder heads is crude, but the basic dimensions are correct. I could label any dimensions you want. I can also export this from Rhino in various other formats, e.g. Autocad, if that would be of any use to you.laser200v.jpg

Jon - Laser Engines18/05/2018 08:27:46
3686 forum posts
146 photos

Nice John. I wish i had fancy 3d tools

trebor22/05/2018 17:26:12
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1515 forum posts
181 photos

Another one landed, it looks like a 70 surprise not too sure without taking it apart. I was told this one only ran the once but I am not so sure due to the sealant on the flanges. What do you think ?

Oppps, helps if I load the pictures blush

img_2921.jpg

img_2919.jpg

Edited By trebor on 22/05/2018 17:32:12

Manish Chandrayan22/05/2018 17:37:17
397 forum posts
56 photos
The first laser (a 150) I bought came from factory with sealant traces visible. So guess that he normal. My all other Lasers were acquired NIB but from others

Edited By Manish Chandrayan on 22/05/2018 17:38:49

trebor22/05/2018 17:49:44
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1515 forum posts
181 photos

Thanks, I know the joints normally dont have gaskets and I rebuilt a couple without any sealant.

Jon - Laser Engines22/05/2018 17:50:19
3686 forum posts
146 photos

Its 70, assembled by my own fair hand no less. Dont worry about the sealant as that is standard as we use it in place of a paper gasket.

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