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HelicopterScale Model RC Helicopters › A bit of advice please
06-04-2010 10:59 AM  7 years agoPost 1
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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I have often wanted to have a go at scale and i have an old but well made G.R.P graupner 500E fuse that i would like to mount one of my spare Kalt gasser airframes into.This was designed(the fuse) for a 60 size nitro,any advice on the best way of mounting the gasser airframe to cope with the stress as i know the vibes can be an issue although the KG 22cc is quite a smooth motor.Like the idea of a gasser scale heli,it does not look much at the moment but work on the fuse could transform it.

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06-04-2010 12:09 PM  7 years agoPost 2
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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i say if the mechs will fit, go for it. mount it like you would any 80 size machine. my concern is gasser mechs are usually wider than their nitro counterparts so the fit especially with those gasser's mufflers and air cleaners/carbs sticking out the side a bit.

drive a rotary, fly a rotorcraft

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06-04-2010 02:40 PM  7 years agoPost 3
shawmcky

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Isle of Wight,United Kingdom

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I checked out the clearance

for the gasser mechs and they will fit albeit without an airfilter that will sit inside the fuse.I was really wondering if there is a preferred mounting method for gasser motors over nitro to absorb the vibes and save the fuse from fractures.

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06-04-2010 03:19 PM  7 years agoPost 4
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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okay cewl.
you can do one or more of several things. you could shock mount the mechs. i remember in the days of my airplane flying, we would soft mount the four strokes to the firewall and that helped with a smoother less shaking airplane. there are those rubber mounts that bolt to the mechs and has a thrreaded stud which would allow mounting to the fuse afterwards. also if you thicken the floor of the mechs that would help. i lay a 1/8" bit of lite ply to the floor of most of my fuses, enough to cover as much as possible. this stiffen the bottom to guard against flexing which have been known to cause shaking and resonance.
withthe many gassers that have been mounted in fuses that have been documented hereon rr and other forums, this matter of vibration has never seem to be an issue so i dont believe theres too much to worry about even for a good ol' girl like the kalt gas baron.
maybe others will chime in with some additional ideas

drive a rotary, fly a rotorcraft

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06-04-2010 03:35 PM  7 years agoPost 5
BeltFedBrowning

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Kansas City

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I love the Kalt gassers. I have 2. One thing to remember is placement of the pull start. My Kalts do not have a top start and using a pull start on a scaler is a pain. I do love the Kalt engines for their smoothness and reliability.

perfer et obdura; dolor hic tibi proderit olim

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06-04-2010 04:33 PM  7 years agoPost 6
shawmcky

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Isle of Wight,United Kingdom

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The plywood mounting sounds like the way

will go with that idea,my old Kalt engine has a cone start fitted underneath and it starts real easy using a lipo powered starter.I have a lot of Kalt gasser parts and love how stable they are in the air.Thankyou guys for the input

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HelicopterScale Model RC Helicopters › A bit of advice please
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