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HelicopterBergen R/C Helicopters › Any idea about this problem?
05-05-2005 11:34 AM  12 years agoPost 1
boomerang

rrApprentice

greece

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Hi,everybody,...

I fly gesterday, with the Observer.The first fly was ok.I just feel that i dont have enough power to fly with good reaction.Second fly,full throttle,and i dont have the power to lift the heli more than 6 meters.

Hummm,

The engine is new.-
RPM 1650
BLADE 670MM
Pich curve -4/+9 linear.-Gaz curve linear to.
Needle Low- 1 T /
Needle Hight 1 1/2 T.

Any way guys Have a nice day.

Nikos Katsoulis

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05-05-2005 11:54 AM  12 years agoPost 2
Malorie

rrElite Veteran

Paw squared, MI

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Try to richen your low needle.

Life's a journey, NOT a destination.

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05-05-2005 11:59 AM  12 years agoPost 3
JuanRodriguez

rrProfessor

The Villages, Florida

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Try richening both needles to see if that might help. Sounds like you may be a little lean...

Secondly, 670 mm blades ??? I think that most are running 700's or 710'l ???

Lastly, I don't know that you should be running a "linear" throttle curve with a gasser...... but I'm sure the more experienced guys out there will comment...

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05-05-2005 05:49 PM  12 years agoPost 4
boomerang

rrApprentice

greece

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I can not say 100% linear,

I know my friend 670mm for a helicam .....is like to have a Mariner engine in the back of a transatlantic.....

Thanks to everybody.

Nikos Katsoulis

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05-05-2005 08:03 PM  12 years agoPost 5
Christopher J

rrElite Veteran

Kansas City, MO Californian lost in land of Oz

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On the Observer I've flown we were running -4, 0, +5, +7, +10 for our pitch curves and our needles on the Hanson 26 were set at 1 1/8 on the low and about 1 3/8 to 1 1/2 on the high needle. Our all up flying weight with camera, full tank of fuel, and equipment was 22 lb 14 oz. We were using 725mm V Blades.

Christopher J
same as I ever was
"Still all set & Flying the original"

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05-06-2005 12:40 AM  12 years agoPost 6
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Any way guys Have a nice day.
And Malorie, you have a great day too!

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05-06-2005 05:40 AM  12 years agoPost 7
rafael

rrApprentice

Oaxaca, Mexico

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Christopher J
What throttle curve are you using?

Rafael Castañeda
www.helicam.com.mx
www.rcoaxaca.com
www.737-700.com/simuladores/

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05-06-2005 12:22 PM  12 years agoPost 8
Malorie

rrElite Veteran

Paw squared, MI

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If you set up your throttle linkages with the 90 and square at half open method, your throttle curve should end up pretty flat around hover (at around 30%) and steep on the high end. In other words, an idle-up throttle curve turns into more of a "U" shape than a "V". This is due to the butterfly type carb not having a nice linear output like the barrel type carb on the glow machines.

I set up the throttle linkages on all my gassers with as much differential as possible and my throttle curves are very similar to my glow machines (0, 50, 100 straight).

If you are running a governor, this helps to maintain a better headspeed also.

Malorie

Life's a journey, NOT a destination.

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05-06-2005 02:45 PM  12 years agoPost 9
boomerang

rrApprentice

greece

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Genthlemen i fix the problem today.

The weather,

hummm,....with wind force 6 beaufort, and a old fashion gyro the GY 401.

Increase the low needle,and decrease the hight.The feeling was good.Reaction like have to be a helicam.

BUT ,hummm.....well (20 year in dojo that help to keep doing r/c heli)

after the last landing ...the cluth was out of the bushings!!Fany!!

My question is this.

Is this a problem from the DERIN BUSHINGS?
Or some vibrations?...4 exemple to rich in fuel?

Thank to everybody.

Nikos Katsoulis

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05-06-2005 03:29 PM  12 years agoPost 10
rafael

rrApprentice

Oaxaca, Mexico

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THANK YOU MALORIE
That draw fully clarify your words, Thank you again.

Rafael Castañeda
www.helicam.com.mx
www.rcoaxaca.com
www.737-700.com/simuladores/

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05-08-2005 03:35 AM  12 years agoPost 11
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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Excessive vibes(engine tuning) will eat the Delrin bushings, otherwise they should last for quite awhile.

Since they've been eaten up, go ahead and replace the bolts as well, as they may have been stressed.

PS. You gotta love that Mal and her pictures!! Excellent Job.

Chris D. Bergen

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05-08-2005 04:53 AM  12 years agoPost 12
rtrickyjr

rrVeteran

Drumore, PA (SW of Quarryville)

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Malorie
Thanks for the great pics of how your gasser differential is setup. I gotta try that one!


-Rick-

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05-08-2005 06:07 AM  12 years agoPost 13
Malorie

rrElite Veteran

Paw squared, MI

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Necessity is the mother of invention.

Life's a journey, NOT a destination.

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05-08-2005 06:15 AM  12 years agoPost 14
fitenfyr

rrProfessor

Port Orchard, Washington

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Hmm...
I learned something that I didn't expect on this thread.
Explains my really weird Throttle curves I was getting with the Gasser.
Time to make some linkage changes.
Thanks Malorie.

Jason Stiffey
Fly Fast....Live Slow...

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05-08-2005 10:12 AM  12 years agoPost 15
boomerang

rrApprentice

greece

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Thanks to everybody...Malorie you make or live more easy.

I take out the engine

Check the DERIN BUSHINGS..result .One is broke.I was luky that the hapen op the ground.

...with is the best pich curve for autorotation with the Observer.-9 +5??is this OK

Have a nice day.

Nikos Katsoulis

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05-08-2005 11:27 AM  12 years agoPost 16
boomerang

rrApprentice

greece

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Necessity is the mother of invention...I LIKE IT!!


For sour in you DNA you have some Socrate genes.

Nikos Katsoulis

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05-08-2005 08:06 PM  12 years agoPost 17
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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Your pitch curve numbers are backwards, I hope.

You need more positive pitch for the flare at the bottom of the auto, it's somewhat a personal preference thing, but I like to have at least 11 degrees positive for the flare.

You'll only need -5 for the actual auto with the increased weight of the Observer.

Chris D. Bergen

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05-08-2005 09:01 PM  12 years agoPost 18
boomerang

rrApprentice

greece

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Thanks Chris

-5 +11

Nikos Katsoulis

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HelicopterBergen R/C Helicopters › Any idea about this problem?
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