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Gasser Model RC Helicopters > After the build..

pgkevet
Veteran
Location: surrey UK

A Big Thank You

To everyone here. It flies!!

A few silly issues.. a leak at the tank bung - I know why but thought I might get away with it.. will be addressed now.. but that meant flying with less than 1/2 tanks today.

Nothing fell off.. and nothing found loose - so far..

Finally noticed the hoizontal fin is on backwards (dumbo!).

When i figure out the 611 I'm sure that tail won't wander.. probably just the gain still too low rather than gyro vibration.

First start-up..a big thanks to RBORT's vid.. went exactly as he showed..twenty pumps on the bubble, 1 choked pull and then started next pull. Factory settings on the carb and my 25:1 mix.

I had throttle hold at 17% but had to drop that right down to 8% then back up to 12% later to get good starts and even tick-over.

I did have to lengthen the throttle link to get total butterfly cut-off.. just 3 turns.

The stupid error I happily put my hand upto was switching the pitch ccpm because it's a leading edge control.. and having reverse pitch .. got quite high revs without a takeoff before I figured that one out!! (dumbo)

4 half-tanks in and no smoke, purring like a kitten, tached at 1600 light on skids..

Is way more skittish than i expected. Dialed in 15% expo and it still feels lively and it really, really wants to be let off a leash- Sadly I'm not a good enough pilot yet and it was a strong breeze. the gusts to 27mph were almost continuous and the hill I fly on has some updraughts - and I'm still a newbie who has just got his circuits almost right and early flips...

I can see why folk go for on-board generators (in the future).. those servos suck a flight pack dry fast!!... I can do 5 maybe even six 7 minute flights on my 600E with a flight pack that would just about last a tankful here..

Overall what can i say:

Easier to start than I expected, quieter, less of a black art than is made out - dirt cheap flight times and despite all the bitching about the kit the final set-up has been very stable..all link lengths within 2-3 turns of the manual (measurng errors), all servo horns just fit level..no sub-trim needed yet (i'll tickle than later if it does).. and blades tracked perfectly from bench set-up

I bought my heli-mate Jonatahn Pitcrew a couple of beers after - and your all welcome to one if you pop down to the field (even Ace - your really welcome too

)..

YIPPEEEE1!!!

pgk

05-18-2008 03:31 PM

jschenck
Elite Veteran
Location: La Vista, NE.

I run a flat pitch curve from -11, -6, 0, 6, 11 in all flight modes.
Here is my current throttle setting for normal mode. 0,20,27,35,100. I start off with it lower. This is with both needles just slightly less than 1.5 out.
If I were you I'd lower your throttle setting to below 30% except for the top end for the first few flights. Better to be al little too low than too high, I think.

...yep...

05-18-2008 03:35 PM

pgkevet
Veteran
Location: surrey UK

..after I get over the high I'll look at all that - I can't even remember what I finally fiddled them to

..but it sounded a happy engine (my old dad used to make me learn to drive a car by listening to it's engine - in the days when you could hear them!)

..as to the needles.. they're where zenoah put them

.. I'll check plug colours and things next time...just a happy bunny right now

pgk

05-18-2008 03:44 PM

xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

Congrats,, PGK,, Welcome to the Gasser World,, It will take a week or two to get the smile off your face,, but don't worry,, It's not a bad thing,,,

XGM/VGM

John Crotts
www.soonerhelicamproductions.com

05-18-2008 04:00 PM

HOMEPAGE

blazobob
Senior Heliman
Location: us

hi pgkevet
glad to hear it went well , well done , bob

RR Master wannabe

05-18-2008 05:25 PM

AceBird
Elite Veteran
Location: Utica, NY USA

Quote
I had throttle hold at 17% but had to drop that right down to 8% then back up to 12% later to get good starts and even tick-over.

Twenty pumps is silly but it doesn't hurt anything. You'll find the idle point will change a little from a cold to a warm engine and certainly as you lean the engine out as it breaks in. The easiest thing in the world of hobby is the starting of a gas engine. If it don't start easy that is a sure sign something is wrong.

BTW you are welcome...

Ace
What could be more fun?

05-18-2008 09:11 PM

pgkevet
Veteran
Location: surrey UK

while I still have the high then ya can have some pics of baby monster.. and a couple of vids..no clever flying (I can't do that yet) but really here so that if anyone with an ear and eye for problems spots one..

<<Twenty pumps is silly but it doesn't hurt anything.>> I'll learn..

http://www.youtube.com/watch?v=DaWF...3,start,50.html

http://www.youtube.com/watch?v=WypP...3,start,50.html

http://www.youtube.com/watch?v=iAk_...3,start,50.html

pgk

05-18-2008 09:49 PM

haggy38
Senior Heliman
Location: Bogotá - Colombia

Nice, enjoy your gasser!

Gustavo

05-18-2008 10:00 PM

pgkevet
Veteran
Location: surrey UK

Ho-hum,

I was hoovering around at 15-20 feet just burning petrol.. it's fourth tank total perhaps when the engine over-revved and lost power; fan or clutch slipping...

Ya gotta realise I still consider myself a beginner.. no choices on where to put down..long grass and weeds, my first real auto (well except for the 600e's motor failing 5 feet up on take-off 2 days ago - not my week)..

Landed with no damage apart from the blade decals scraped by trimming weeds. Teething stuff so not that unhappy...

I don't see any short-cuts to taking this apart since I need to get the fan shroud off?? Any tricks?

I suppose it's an opportunity to reverse the torrington...I was gonna leave that for the future..

pgk

05-21-2008 11:58 AM

Fixit
Key Veteran
Location: UK

Did you do the cross frame mod when you built the Heli?
If you did the motor comes out in 10min's

05-21-2008 12:04 PM

HOMEPAGE

pgkevet
Veteran
Location: surrey UK

Quote
Did you do the cross frame mod when you built the Heli? If you did the motor comes out in 10min's

..please explain (slowly)..

..Oh and this is the carbon version if that makes any difference..

pgk

05-21-2008 02:57 PM

zone8
Senior Heliman
Location: Ireland

He means the X shaped front vertical frame (part HW6112B) in front of the engine. At the top of the X if you dremel out the horizontal bit, it will clear the engine, then you can just undo the 8 bolts holding the landing gear frame 6117B and the entire engine will come out very easily. If you did not do the mod, now to take the engine out you have to remove the entire upper frame assembly.

How do you know it was the clutch slipping..? If you poke the clutch shoe with an hex driver is it still in one piece? Mine broke once.

05-21-2008 03:50 PM

pgkevet
Veteran
Location: surrey UK

OK so wil have to do it the hard way and mod after..

Dn't know it's cluthc slipping .. but best guess that fan hub wasn't dogged down enough..seems unlikely to be a fractured clutch hub after just a few flights?? I'll find out <sigh>

That's all my three helis out of the sky with mechanical failures in flight in three days!! The little 450 lost tail pitch control today..and just after touchdown decided to do the checken dance witout provocation while I was hitting hold.. tails servo finally managed to get a bite on the pitch control!

pgk

05-21-2008 04:39 PM

jschenck
Elite Veteran
Location: La Vista, NE.

Front X frame mod -

...yep...

05-21-2008 05:29 PM

pgkevet
Veteran
Location: surrey UK

OK guys.. Now I really need your help!!:

I've got the top frame off..

With the piston stopped I cannot rotate fan or clutch with hand strength which suggests it's not slipping? The clutch looks as was except for some of the black being worn off on the bits that are supposed to fly out/engage the bell.

So superficially that seems not to be where the problem was.

Clutch slipping? Something in the mechanism above?

Am I right that the pinion is threaded on and therefore can't slip?

How do you tell if clutch liner has gone and why after just a few flights? Seems as thick as was.. just got the black from the clutch on it and yes it's smooth..but then it would be..

Where from here?

pgk

05-21-2008 06:00 PM

zone8
Senior Heliman
Location: Ireland

Yes the pinion is threaded so it can't slip. Before wasting a liner with three tanks you would have seen some smoke I guess. Check with a magnifier for hairline cracks in the clutch bell... However, how do you know it was the clutch slipping? It might be a stupid thing like the clunk line come loose in the tank.

05-21-2008 06:57 PM

pgkevet
Veteran
Location: surrey UK

Well the pinion is slipping .. I can hold the clutch bell in my hand and turn either way as many turns as I want!!!!

Quote
<< However, how do you know it was the clutch slipping? It might be a stupid thing like the clunk line come loose in the tank>>

I figure that doesn't cause the engine to race and the blades to slow down???

I'm not a happy bunny! I want to play with my new toy ..not mend it.
Now I gotta try to source a replacement century part...

Who keep the best preddy spares stocks?

I've obviously emailed the original vendor.

pgk

05-21-2008 07:05 PM

jschenck
Elite Veteran
Location: La Vista, NE.

Quote
Well the pinion is slipping .. I can hold the clutch bell in my hand and turn either way as many turns as I want!!!!

post some pix when you have that figured out - I don't see how you could do thatn unless something is really broken or the threads are stripped. I thought perhaps you may be experiencing the one-way bearing letting loose of the mainshaft but if your pinion can spin inside the clutch bell that would be a problem.

...yep...

05-21-2008 08:03 PM

rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Hmmm...

On the Xcells the pinion is threaded into the clutch bell. Screws in the normal way if I remember right, not reverse threads. Its just locktited in there. Not sure how the Predator one is built but definately the clutch and the pinion need to be ONE piece with no movement possible in either if you hold the other.

Post some pictures, also curious to see what you're looking at.

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator

05-21-2008 08:07 PM

pgkevet
Veteran
Location: surrey UK

http://www.youtube.com/watch?v=NxOQarjg8zc

A vid of what I mean .. assume it shouldn't do that..

pgk

05-21-2008 09:17 PM

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