Will a BD3SX take gasser vibes ??

[Skipper Billy]

I am thinking about dusting off my Rex 700 gasser and converting it to flybarless.

I havent flown for ages so I am thinking about installing a FBL system that has a bail-out feature.

I am considering a Bavarian Demon 3SX and have three questions.

Will it stand the vibes of a gasser ??

Is there a better unit ??

Is it worth waiting for the (alleged) new BD unit ???

[trillian]

I would think it will but that's just a guess. I'd ask in the gasser forum at Helifreaks as I would imagine someone there knows for sure how well it handles vibes or what's the best way to mount it etc.

Is yours a Helibug, Helix etc. or a homebrew conversion?

[Skipper Billy]

Thanks Trillian - its a Helibug conversion. It flew really well last time I flew it (3 years ago!!) and I want to go flybarless but need a safety net until I get my confidence back !

[trillian]

Just saw this:

I know some gassers are flying on VBars and they seem historically more sensitive to vibes than some other units.

I have a Helix with a Skookum 540, no problem at all with vibes. Engine is a stock Zenoah 260RC.

The Spirit and the VBar Neo are the newest FBL creatures with a rescue feature but the Neo is currently only out in a version that works with the Vcontrol and the generic version is promised soon.

[coolice]

Evening Mate.

Having setup a Helibug 700e DFC conversion with an HC3-SX, you need to make sure vibes are at a minimum and that the FBL unit is well insulated from them. On the machine I am going by, it was flying fine for a short while and then had an almighty twitch while hovering. Further investigation while on the ground showed that the minute the engine was running, all the servos are jittering due to the vibes resonating through the frames.
The fix in the end was a wooden platform and moving the FBL unit to the rear on top of the boom block, which isn't necassarily the best place again, but it was better than up front and the machine was flyable with no signs of vibe induced problems.

Also on this model I suggested isolating the throttle servo from the frames with some vibration absorbing material, the PU gel worked well i nthe end, as it destroyed one throttle servo. Luckily some skillful use of a long branch while I hovered the model o nthe ground stopped the engine, as I didn't fancy hovering for over 45 minutes with a full tank.
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[Mike Sanders]

I can just picture the scene. Someone trying to hook a twig round a throttle linkage with the engine screaming away.

[coolice]

I can just picture the scene. Someone trying to hook a twig round a throttle linkage with the engine screaming away.

Evening Mate.

Lol. It was pretty intense, I was basically flying the model with one skid in contact with the ground ready to roll it away from the owner while he poked aroudn trying to move the throttle barrel.
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