Dave Patrick Edge or Extra on a Laser 150
01-24-2006 | 05:01 PM
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From: Uphall, Scotland, UNITED KINGDOM
Dave Patrick Edge or Extra on a Laser 150
Hi all,
The DP Edge or Extra is on my list of models being considered for this year. However I'd really like to use my Laser 150 four-stroke but need to know if it is up to the job. I'm not capable yet of wild 3D stuff but will want to at least prop-hang and pull out vertically. Any & all advice gratefully received.
BR
Tom Laird
Scotland UK
www.tomlaird.com
The DP Edge or Extra is on my list of models being considered for this year. However I'd really like to use my Laser 150 four-stroke but need to know if it is up to the job. I'm not capable yet of wild 3D stuff but will want to at least prop-hang and pull out vertically. Any & all advice gratefully received.
BR
Tom Laird
Scotland UK
www.tomlaird.com
01-25-2006 | 09:29 AM
#3
Senior Member
My Feedback: (13)
RE: Dave Patrick Edge or Extra on a Laser 150
Tom, IIRC both those airplanes you mentioned are far too large and heavy for the sort of performance you desire with a Laser 150. I've had my Laser 150 for about three years now...
1. Goldberg Ultimate bipe- this is a 60-sized biplane, with 54" wing span, nine pounds. IMO, the Laser 150 is the pefect engine for this airplane; but it will NOT "hover". With a Graupner 16x8, it has enough vertical to fly through big loops and hold an upline for a couple of hundred feet. But the sort of prop-hanging "unlimited vertical" that is so popular these days, just isn't there.
Remember, this is a low-compression/low-rpm engine, designed for extreme reliability with FAI (no nitro) fuel. I run mine on Cool Power 15% synthetic, and get around 8500 max with the Graupner 16x8. The nitro makes for a ridiculously smooth, low tick-over (idle). It doesn't do much for the top end, according to Neil Tidey.
2. Goldberg Sukhoi- This is a larger model, probably close to what you're looking at; 73" span, 11.5 pounds. The Laser 150 was BARELY enough to fly basic manuevers; forget about any "extreme" stuff.
I really have enjoyed my Laser; with the exception of the flexible exhaust extension that didn't hold up (none that I have seen, do for any length of time), the engine has been totally trouble-free and dependable. It has the equivalent power of a Japanese 1.20, IMO. Which means that nine pounds or so is the upper limit if you want very lively performance. It will fly a heavier plane with no problem; but you'll have to fly it like a REAL plane... i.e., on the wing instead of on the prop.
1. Goldberg Ultimate bipe- this is a 60-sized biplane, with 54" wing span, nine pounds. IMO, the Laser 150 is the pefect engine for this airplane; but it will NOT "hover". With a Graupner 16x8, it has enough vertical to fly through big loops and hold an upline for a couple of hundred feet. But the sort of prop-hanging "unlimited vertical" that is so popular these days, just isn't there.
Remember, this is a low-compression/low-rpm engine, designed for extreme reliability with FAI (no nitro) fuel. I run mine on Cool Power 15% synthetic, and get around 8500 max with the Graupner 16x8. The nitro makes for a ridiculously smooth, low tick-over (idle). It doesn't do much for the top end, according to Neil Tidey.
2. Goldberg Sukhoi- This is a larger model, probably close to what you're looking at; 73" span, 11.5 pounds. The Laser 150 was BARELY enough to fly basic manuevers; forget about any "extreme" stuff.
I really have enjoyed my Laser; with the exception of the flexible exhaust extension that didn't hold up (none that I have seen, do for any length of time), the engine has been totally trouble-free and dependable. It has the equivalent power of a Japanese 1.20, IMO. Which means that nine pounds or so is the upper limit if you want very lively performance. It will fly a heavier plane with no problem; but you'll have to fly it like a REAL plane... i.e., on the wing instead of on the prop.
