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Laser 4-stroke engines

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Old 11-02-2004, 11:16 PM
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khodges
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Default Laser 4-stroke engines

Anybody got any experience with these British-made 4-strokes? Saw them while on Proctor's website; they look really nice
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Old 11-03-2004, 12:33 AM
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Default RE: Laser 4-stroke engines

Hello; I have a Laser 100 in a Balsa USA Taube, and it's my favorite engine. I mix my own fuel for it. It runs better then any of my other four strokes and suits the Taube perfectly. It's an easy starter, will idle all day, and is the quietest plane at our field. It is compact, light, and swings a big prop. I use a 15x8 APC, which is what laser recommend. I have it mounted on Sullivan anti-vibration mounts. If you have any specific questions feel free to E-mail me.
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Old 11-03-2004, 06:27 AM
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Default RE: Laser 4-stroke engines

My first 4stroke was a laser 70. Nice engines, very reliable, dont need high nitro, are more compact than most other 4 strokes, and can even be retimed to be run backwards for pusher planes .

Best for scale and sport uses, there are other better engines if going down the aerobatic/3d route.
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Old 11-03-2004, 08:18 AM
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Default RE: Laser 4-stroke engines

I have a 150. I can say without reservation that it is the highest quality, most reliable model engine I've owned; and I've had a pile of them since beginning the hobby in 1987...

They have dual piston rings and are designed to run on no nitro. Consequently, they put out less power than the other popular engines of equal displacement. My Saito 150 would swing a bigger prop, but it was heavier too. This 150 weighs 30 ounces with its odd muffler, and puts out the same "power" as a Jap 120, with equal or a bit less weight.

What you get for that is an utterly dependable, smooth engine that is a joy to operate. I have been flying mine in a Goldberg Ultimate for a season, so I think I have enough time on it to form an educated opinion. It is now fitted on an EF Yak, and if I can ever find the time to get that puppy finished...

The carburetor and exhaust locations are a bit unusual, and require some out-of-the-box thinking when fitting a cowl; but that's why we call it modeling, eh?

Sorry for the poor photo quality, but this is the only one I have handy.
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Old 11-03-2004, 11:36 AM
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Default RE: Laser 4-stroke engines

ORIGINAL: Steve Campbell
Sorry for the poor photo quality, but this is the only one I have handy.
This one is better / For comparison with a Saito FA 100

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Old 11-03-2004, 06:26 PM
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Default RE: Laser 4-stroke engines

Hans--thanx for the pix--putting one (Laser) next to my favorite engine brand (Saito) was a perfect comparison. It would be hard for me to try anything different, because the Saito's work so well, but the Laser really looks worth a try. I've decided to try a biplane and the Proctor Sopwith 1-1/2 Strutter is the top runner right now--not a lot of them (at least not as many as all the generic ARF's available) and the scale detail looks like something I want to spend some time and effort on. I may just order a Laser as part of the package.
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Old 11-04-2004, 10:03 AM
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Default RE: Laser 4-stroke engines

What do you do about the tank height in relation to the carb if mounted inverted or upright? Seems like a problem with leaning or richening if flying aerobatics.
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Old 11-04-2004, 01:18 PM
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Default RE: Laser 4-stroke engines

Yes,if you mount the motor inverted you have to get the tank low(follow the normal practice of tank to spraybar relationship).I had my Lazer 80 inverted in a world models mustang and had all sorts of problems with the tank being too high.Dont get me wrong,the Lazers have very good fuel draw but the normal rules still apply.Most sport installations of the Lazer have them on there side with no problems.On most aerobats the built in side thrust,and consequent off centre mounting of the engine puts the carb in a good position when mounted sideways.I had mine in a Kyosho Cap like this and it put up with the most extreme manouvres without missing a beat.Power wise,I get 9500 RPM on a apc 14 x 6 using 5% nitro.
Jim
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Old 11-04-2004, 03:23 PM
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Default RE: Laser 4-stroke engines

<<...normal rules still apply...>>

Yup. I bought a Cline regulator for the Yak, since it has the tank too far back and too high, with no practical way to re-position it.

Sure hope it works...[&o]
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Old 11-04-2004, 04:14 PM
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Default RE: Laser 4-stroke engines

Heyyyy they come with Jetstream carbs too now? The Lasers in my club are quite old so have diffrent carbs. They run good though. The 25cc 1.50? does a 16x6 MA with 8500RPM on 1% nitro.
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Old 11-04-2004, 05:41 PM
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Default RE: Laser 4-stroke engines

ORIGINAL: JIMBO D

Yes,if you mount the motor inverted you have to get the tank low(follow the normal practice of tank to spraybar relationship).I had my Lazer 80 inverted in a world models mustang and had all sorts of problems with the tank being too high.Dont get me wrong,the Lazers have very good fuel draw but the normal rules still apply.Most sport installations of the Lazer have them on there side with no problems.On most aerobats the built in side thrust,and consequent off centre mounting of the engine puts the carb in a good position when mounted sideways.I had mine in a Kyosho Cap like this and it put up with the most extreme manouvres without missing a beat.Power wise,I get 9500 RPM on a apc 14 x 6 using 5% nitro.
Jim
One other thing about the carb-- can it be rotated in relation to the engine so you can bring the needle adjustment out the side, bottom, etc when you mount it inverted or sideways?. Looks like it could, from above post's pictures.
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Old 11-04-2004, 05:52 PM
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Default RE: Laser 4-stroke engines

[sm=thumbup.gif]Yes the carb,and exhaust, can be rotated as much as clearance with each other will allow to suite you plane
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Old 11-04-2004, 07:13 PM
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Default RE: Laser 4-stroke engines

My 1.80 V-Twin has carbs that look like SuperTigre carbs but they aren't, a Cline regulator works perfectly when hung between the carbs on a Tee. On my old slab tailed UltraStick the carbs were above the fuse top.
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Old 11-04-2004, 07:33 PM
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Default RE: Laser 4-stroke engines

One "think about" if you decide on LASER engines. Due to the rather unorthrodox carb positioning, MAKE SURE that you have the engine set up as close as possible (carb adjustments) as getting to the idle needle is the proverbial BI*** once cowled. I do a lot of the engine tuning for my OFB who uses LASERs almost exclusively with a smattering of SAITOS for his mini-IMAC stuff. All the LASERs run GREAT!
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Old 11-05-2004, 02:55 AM
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Default RE: Laser 4-stroke engines

Hobbys,

Those are Irvine carbs on the Lasers, a close cousin of the ST carb.
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Old 11-05-2004, 07:40 AM
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Default RE: Laser 4-stroke engines

They even have the same spraybar setup where you can rotate the spraybar.
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Old 11-05-2004, 11:28 AM
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Default RE: Laser 4-stroke engines

Because not that much amount of pictures are available on the net, here one of the V200
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Old 11-05-2004, 12:58 PM
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Default RE: Laser 4-stroke engines

A few more photos of a 240
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Old 11-05-2004, 01:10 PM
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Default RE: Laser 4-stroke engines

200V versus 300V

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Old 11-05-2004, 03:33 PM
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Default RE: Laser 4-stroke engines

Hans,

Would you tell me the inside diameter of the barrel on the 300 vee's carbs?
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Old 11-05-2004, 05:00 PM
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Default RE: Laser 4-stroke engines

8,3 mm for the 300
7,5 mm for the 200
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Old 11-06-2004, 07:25 AM
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Default RE: Laser 4-stroke engines

Thank you Hans,

Looking to install a Irvine carb on my Enya R155. The Enya carb is 9.5mm and requires the engine to be very rich at idle in order to get good transition thru the midrange. Now I just need to find out what size Irvine engine that carb is on to order one.

Have you seen a Laser 180 single yet? Do they exist?
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Old 11-06-2004, 08:35 AM
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Default RE: Laser 4-stroke engines

ORIGINAL: Skypilot_one
Have you seen a Laser 180 single yet? Do they exist?
The 180 and 360 twin exist
Have seen it on a picture somewhere. The 180 is a bit like the 300 housing with a single cylinder.
It is heavy too 1200 gr something like that. The 360 is as the 300 with a longer stroke.
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Old 11-06-2004, 08:38 AM
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Default RE: Laser 4-stroke engines

Here is my LASER 180 circa February 1992 and my Fox Eagle IV .60 ready to do some DynaTorque testing with different nitro levels. But not today, being the Grandfather of 18 reeks havoc with hobby stuff.
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Old 11-06-2004, 09:34 AM
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Default RE: Laser 4-stroke engines

Hi, did succeed in finding the link to a 360 picture



it is locaed in:

http://www.rclineforum.de/forum/thre...&hilightuser=0

a German forum
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