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HelicopterBergen R/C Helicopters › Intrepid Gas Gear Ratios Question
04-01-2005 05:17 PM  13 years agoPost 1
rafael

rrApprentice

Oaxaca, Mexico

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Hi all, I´m ordering today the 14T pinion gear for my Intrepid that currently has a 11T, My questions are:

Are the gear ratios for the 11T and 14T, 8.18 and 6.43 respectively?

If I want a target main rotor speed of 1350 RPM(720 Vblades) for hover the engine, should run at 11,043 RPM(1350*8.18) with the 11T pinion gear and 8,681 RPM(1350*6.43) with the 14T pinion.

If the above statement is correct with the 8.18 I would be on the edge running at 11,000RPM because the zenoah manual calls for a target of 9,000-10,000 at full throttle.

Using 14T would give me a lower engine RPM and some spare RPM's, what I think is better and safer.

What do you think about this? Are my numbers correct? is anything that I´m missing?

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

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04-01-2005 07:54 PM  13 years agoPost 2
wolfdad

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Southern Maryland

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Your math is sound, however the 14T pinion was the stock pinion for the 23...I would recommend you go with the 13T (if you have the 26) and take a look at the math again...that should put you at about a 6.92 ratio. Re-read your post and you don't say which engine you have, however the above is applicable.

I am dropping down to an 11T because I am running the Hanson 3D Pro Max and I need that ratio just to get into the Hanson's power band at 1650-1700 head speed.

Once I get the 11T installed, I will be posting results.

wolfdad sends....

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

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04-01-2005 08:42 PM  13 years agoPost 3
rafael

rrApprentice

Oaxaca, Mexico

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G26PUH
Wolfdad thanks for you help...

I´m using G26PUH. For what I have read the 3D ProMax has a max RPM a lot higher than the stock G26, But now that I know you are going to use the 11T do you think I really need to make the change, how bad or good is running the G26 at 11,045 RPM to get the 1350 RPM in the main blades.

Thanks in advance

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

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04-01-2005 09:40 PM  13 years agoPost 4
wolfdad

rrKey Veteran

Southern Maryland

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rafael,
I would recommend running a head speed somewhat closer to 1600. I believe that would be a bit more to your liking. You might even want to start at 1500 just to get a feel for it. For the G26, I would recommend the 13T pinion. Quite honestly, I think the 1350 head speed will not give you the full, outstanding flying characteristics of the Intrepid. The 13T pinion should put you smack in the middle of your power band at the 1600 head speed.

The Hanson has a top end RPM potential of 16800 and my target with the 11T pinion is 13770RPM and we'll see where it goes from there. I also have modded my Intrepid with the heavy-duty 31 1/4 inch EB tail boom, split TR drive shaft with the dual bearing carrier and the EB tail rotor gear box and, right now, slinging 700mm MAH blades. Will keep you posted on results. Hope to fly it this coming weekend.

Good luck with your's

wolfdad sends...

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

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04-01-2005 11:38 PM  13 years agoPost 5
rafael

rrApprentice

Oaxaca, Mexico

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Wolfdad, thank you again, I will order the 13T in the near future.

good luck with yours too.

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

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