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HelicopterAntiques or Out of Business › Kalt Omega Pro
10-24-2004 10:21 PM  13 years agoPost 1
donlynn

rrKey Veteran

New Zealand

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Gidday

Unfortunately my buddies virgin 60 size Kalt Omega Pro tail retaining bolt let go yesterday, anyone have any good ideas as to why the wee screw broke and it threw a blade ?
my guesses from my tt experience are to tight , ground strike or defect

or any improvement to stock to minimise same fault ?
It's never hit the ground( one lady owner ) and this is it's 4th hover just starting into fff.

What a awesome machine , its just so smooth, grooves like a charm sounds very cool and the head , with its underslung flapping connecting rods, a fiddlers dream !!

he did some over the top payload testing to confirm engine reliability hover oge
29 lbs incl heli !!

We're also looking for a new main gear
http://runryder.com/helicopter/t137...highlight=Omega

Thanks for your time

Regards Don

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11-13-2004 11:08 AM  13 years agoPost 2
revman

rrApprentice

Leicester UK

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Kalt

Got a bunch of Kalt stuff, mainly GS but got a boxed set of frames and mechs for an omega . Local shop closed and i work for the old oner and he's kept the stock.
Which tail pitch mech you using?
Changed my Gasser to a raptor style bow and mech so parts easier.
Got a a load of heads here too.

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11-13-2004 12:21 PM  13 years agoPost 3
nivlek

rrProfessor

Norfolk England

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One of my Omega Pro's did the same thing this summer, I'm now down to two and a half Omegas.

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11-13-2004 12:47 PM  13 years agoPost 4
MJA

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UK

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I thought the Omega Pro would have the thrust raced hub upgrade as std.It was a known problem with the std hubs (where a grub screw & nyloc holds the bearing and grip assembly on ) that they would occasionaly throw tailgrips.The std hub ,bearing and grip assembly was fitted to the Cyclone,Alpha & Alpha2 but i thought the Professor and Grand Prix would be the thrust raced grip upgrade with the full steel shanked centre hub with end thread(like Hirobo and Robbe use).

Catching/scraping the tailblades won't help but i'm not convinved that's the only thing that causes grub screws to shear,i think it can be fatigue over time with any tail shake accelerating it.Anyway the upgrade hub is better if it doesn't already have it as it also uses thrust raced tailgrips.


Martin

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11-13-2004 01:15 PM  13 years agoPost 5
nivlek

rrProfessor

Norfolk England

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The bolt that failed on mine was the 3mm allen bolt that goes through the blade holder and bearings and into the centre hub.

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11-13-2004 06:40 PM  13 years agoPost 6
MJA

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UK

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Sorry I thought they were long grub screws with an M3 nut on the original (****)
versions of the hub,like the Raptor V1 hubs,but into a steel centre.The upgrade hub/bearing and blade grips looks like the one below.They were about 35 quid then when JPerkins were still importing Kalt/sanwa stuff

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11-13-2004 07:16 PM  13 years agoPost 7
nivlek

rrProfessor

Norfolk England

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Footaba,
Looking at you photo, you are correct.I haven't really looked at the heli since the failure but looking at the photo it would seem that what actually snapped was the threaded portion of the hub, hense it threw one blade.For some reason I had just assumed that it was a bolt threaded into the hub.
Actually this resulted in the funniest crash I have ever had.Prior to the failure, and possibly a contributory factor, I had replaced the wire drive with a solid plastic rod of about 4mm diameter. Also the original boom ,
which was tapered, had been replaced with a boom made from a Shuttle boom and a Calibre boom joined together.I was just hovering the heli to set up a HAL auto pilot so that I could let some fixed wing flyers have a stir on the sticks (I would have also used the buddy box if
things had have worked out).Anyway a second or so before the failure
I heard a slight noise so I was about to land but the tailblade came away and the heli started to turn.Then something jammed the tail drive at the tail end.The result of this,with my now unbreakable taildrive shaft, was that the shaft "wound up" and collapsed the two piece boom up into the main blades!
I did manage to hit the throttle hold at some point during these events
but only stopped the heli thrashing itself to death on impact.
In reality all I would need would be a new tail hub, one new side frame,
an under carriage strut and maybe a couple of other bits but as I have two othe Omegas I will just use it as spares.

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11-14-2004 05:36 PM  13 years agoPost 8
MJA

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UK

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What did the fixed- wingers think after witnessing the boom collapsing up into the blades,i bet they weren't so keen to have a go (even with a HAL)after seeing that,not that they could of anyway once it was knackered

Martin

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11-14-2004 05:50 PM  13 years agoPost 9
nivlek

rrProfessor

Norfolk England

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Only one learning fixed winger was present! It was unfortunate that there were not more people to enjoy the crash.If somebody gets a good laugh out of a crash it doesn't seem so bad, it's better than having a repair bill with nobody having had any fun.

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11-16-2004 08:35 AM  13 years agoPost 10
donlynn

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New Zealand

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Gidday
I love your positive outlook !!, nothing worse than having to jump on your convulsing remains to pull the fuel line.

my apologies for not replying earlier to all your responses.

So do any of you blokes have a spare one piece tail centre as per Footaba's pic ?
My buddy has done more dismantling and it seems the tail drive portion on top of the main gear actually seperates from the main gear via the one way assy mounting screws, so he only needs the top tail driving part.

thanks regards Don

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