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HelicopterBergen R/C Helicopters › 13 tooth Pinion?
03-28-2005 09:57 AM  13 years agoPost 1
Heli2_de

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Germany

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I'm just looking the new bergen side and saw, that the stock pinion for the gasser has 14 tooth. my pinion has 13 tooth. was there an update? What is the difference between the stock fan and the upgrate fan? My one is aluminium too.

Mike

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03-28-2005 10:32 AM  13 years agoPost 2
wolfdad

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Southern Maryland

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Mike,
I bought my Intrepid in the late spring of 2004 (right about now a year ago) and mine also came with the 13 tooth pinion. That pinion was fine with the stock 260, however I have found with the Hanson 3D Max, that I am going to have to drop down to an 11 toother to make best use of the power band on this engine. This was based on Chris' recommendations during set-up. Since my purchase, I've seen the Intrepids come with both the 13 and 14 tooth pinions and I'm not sure exactly why....might be worth a call or email to Larry for clarification.

wolfdad sends...

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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03-28-2005 01:08 PM  13 years agoPost 3
Bushy

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Tucson, AZ

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Hi guys.

All three of my G23s came with 14t pinions which is understandable considering the rpm range they run in. I ordered in a 13t in anticipation of running the G26, however it is not in stock condition. I'd say it is somewhere between the Pro and 3D so I'll probably get a 12t also to be covered. Lightened, ported slippery nickel piston, lightened wristpin, balanced crank and flywheel. No porting on the crankcase or cylinder.

Finished assembly last night, bolted to the test stand and spun it up in the shop for 30 seconds. Smooth at idle. 1st gallon (Ozark/LawnBoy) will be on an oversized prop adapter, 18-6 prop, and an early version Unobtainium muffler (For the neighbors).

Dave

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03-28-2005 01:25 PM  13 years agoPost 4
wolfdad

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Southern Maryland

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Dave,
The 230/260 swap over and the timeframe in which I purchased mine was what I thought the difference probably was, however I wasn't sure enough to post that as a response. That would make sense for the 13 vice 14 tooth pinion.

Sounds like you've got your's just about ready to go....I have to chuckle about the Unobtainium comment.

BTW, 11 years on 24 March.

Take care,
Doc

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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04-05-2005 04:36 AM  13 years agoPost 5
mike lewis

rrApprentice

northeastern AZ

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BUT BUT BUT what about my 800mm blades
How much do they change the ratios needed, I find that a 90 tooth main and an 11 tooth pinion gear will over rev a stock G26 in order to just turn the main blades at 1650 rpm. Does any one know if the stock G26 will vibrate as badly at 10,ooo as it does adt 13,500 and or if it will be off it's power curve ?

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04-05-2005 11:17 AM  13 years agoPost 6
wolfdad

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Southern Maryland

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Mike,
I re-read a couple of your posts/replies and, I am assuming/hoping you are running with the EB kit/modification if you are running 810/800mm blades. If not, your TR and Main blades are going to become "kissin' counsins." As I understand it, the switch between the 14T and 13T pinions was brought about by the switch to the G26 engine coupled with the ability to run longer (720mm) blades. The 11T pinion came around with the EB and EB modification kit (speaking strictly Intrepid here and not the Observer or Twin) for running the 810mm blades. The 11T pinion, to me, would take you below the stock power band if you are not running the longer blades in conjunction with the EB package.

I am on a "horse of a different color," so to speak and am running the shorter, stock-length (33 inches), heavy duty EB tail boom and EB tail rotor gear box with the Hanson 3D Pro engine. This engine has a spec'ed max RPM value of 16,800, so to get into the power band, I dropped down to an 11T pinion. With the 13T, my throttle curve was almost non-existent just to keep the head speed down to a manageable level. I flew yesterday and the 11T pinion coupled with some throttle curve adjustments appears to put me smack dab in the middle of the Hanson's power band (about 13,770 RPM if my math serves me correctly). I was not able to tach it yesterday, however, by sound alone, I can tell that the 11T did the trick. Will get a tach on it once I have a partner with me.

On the vibration issue, I would be hesitant to answer your question, other than to say that if you have vibration (noticeable) at 10K RPM, you are probably going to have it at a higher RPM as well and that you probably need to go looking for the source, i.e. crank shaft run-out, loose items, etc. Since you don't mention the vibration symptoms, it could be anything from engine tuning to TR thrust bearings installed incorrectly. Although a gasser has a bit more inherent vibration, the Intrepid, properly set-up and with a well-tuned engine is an incredibly smooth machine.

wolfdad sends....

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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04-05-2005 02:42 PM  13 years agoPost 7
rafael

rrApprentice

Oaxaca, Mexico

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Why did I get the 11T?
Hi all, I did get my Intrepid Gas on November last year, mine came with the 11T pinion, not running the EB and stock G26 Does any one know why? I think I will PM Chris asking about that?

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

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04-05-2005 03:07 PM  13 years agoPost 8
wolfdad

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Southern Maryland

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rafael,
See my reply above. The EB, per my understanding, had the 11T included due to the increased size of useable blades (810mm) and resultant higher lift at a lower head speed.

wolfdad sends...

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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04-05-2005 10:59 PM  13 years agoPost 9
charger

rrApprentice

Spencer MA.USA

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I have the 13t with a G26 and my intrepid was purchased as a intrepid EB,with the nhp 800 blades.The engine was sent out today to Hanson tohave the pro heli mods done.I didn't know I could have order it with a hanson engine.she will be a dedicated camera ship.
I would really like to be keep posted of your progress and result of your testing that you (wolfdad) and crazy horse are having running the Hanson 3Dmax engine, I 'am also looking into another intrepid running the the twin tail box and 720 blades, and that engine sound like the right trick.

Old chinese proverb.don't dwell on past crash, but look forward to future flight

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04-05-2005 11:09 PM  13 years agoPost 10
wolfdad

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Southern Maryland

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charger,
I think you will be extremely impressed and extremely happy with your engine once you get it back. Will keep the forum posted on the "truck adventures."

wolfdad sends...

"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105

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