gasser vibration

[paulw1283]

What is the primary reason for gasser vibration? (compared to nitro)

Is it because the gasoline engine is bigger and have heavier pistons?

How big exactly is the difference?

Do gassers vibrate like a cellphone on "vibration"? Or is it more subtle?

Thanks

[bigrcr]

The gas motors vibrate more than glow primarily because of the higher reciprocating mass and from of course being a single cylinder. This makes nearly no difference as a chain saw or yard implement (although these devices are now getting iso-mounting) but in a helicopter the vibration can do bad things like mess with gyros, harm electronics and break airframe components.

With that being said, the gas motors that we use now in comparison to the older versions have very little vibration to deal with.

The vibration level will depend on many things such as the model, motor, tuning, amount of oil used in the fuel, etc.

The vibration from the motor itself rarely causes an issue. The real problems are harmonics that are induced or perpetuated by the motors vibration.

I guess you might say the vibration may be like a cell phones "vibrate" mode.

Later,

[paulw1283]

Hmm...I have a lawn trimmer and that vibrate A LOT. Please don't tell me the gasser is like that.

[rbort]

Hmm...I have a lawn trimmer and that vibrate A LOT. Please don't tell me the gasser is like that.

I've been flying gassers since 1997 and I've logged over 1540 flights on my 1005 and over 80 on my Spectra-g since last September when I got that one. Yes they do vibrate but if you take the time to build them right, get your motors balanced at Hanson to reduce the vibrations, you can fly hours of enjoyment for pennies on the dollar compared to nitros. Every flight you make you save $2.50 or every 400 flights the gasser pays for itself. If you just put that $2.50 in the bank (money you would have spent on nitro fuel to get a nitro machine it in the air), then after serveral flights you will notice you now have a "free" crash repair fund that will offset costs of a crash in case God forbid you go in.

Just to give you an idea I've crashed my 1005 12 times over the years. If you calculate the savings (1540 x 2.50) = $3,850 / 12 = $321 per crash funds from my "insurance policy bank account". Not bad as that will pay for most of the crash if not all depending on how bad it was. So the bottom line is fuel savings = free parts down the road and lots of enjoyment and no hassle, mess, or field equipment.

So don't get scared by a little more vibration than nitros. They still fly and they still do really well inflight, enough to give you hours of enjoyment at a fraction of the cost.

Oh yeah, and now for my plug-in...equip your gasser with an on-board generator and then you can go to the field and gas and go all day long using a JR 1400mah (for example) pack as a battery backup only. How can you beat that? Not even a field charger with you on the field either!!

-=>Raja.

[Gary Travis]

I have over the past year and a half dealt with quite a few gasser owners with different models and different engines, to date all of there issues were solved by propper set up and engine tunning. Also as John mentioned propper oil mixture is a very big factor. When doing the Bergen gasser tunning video I Tried to address all of these issues. And with the new video I am doing I will go further in debt with tunning.
Todays gassers have come a long way from the gassers of the past and with the continued hard work of guys like John Garst and Bill Meador i see them becoming more and more popular
Gary Travis

[Dr_Fibinotchi]

yea.

Its strange. I was at the field one time and a friend put his bergen gasser with a tiny CF fin. As we increased the hover throttle you could see the fin go glass smooth and then vibrate a little going up in rpm. Its a harmonics thing alright.

What I would like is a sensor on the bird so I can tune and see the harmonics on a waveform. Imagine someone doing that at Ircha take the guess work out of mechanics engine fuel etc..

-Cody

[Rodney]

Gassers Rule.