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11-29-2007 06:26 PM  9 years agoPost 1
ecoliburger

rrApprentice

NORCAL

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Anyone know the gear ratio off hand of the calib 4? Trying to set up a governor.

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11-29-2007 09:02 PM  9 years agoPost 2
cyclic fever

rrApprentice

Seymour Indiana

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Not off the top of my head but I think its 8.5

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11-30-2007 12:31 AM  9 years agoPost 3
wheelnet1

rrApprentice

Flower Mound Tx

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I think its the same as the C5 upgrade, which is 9:1

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T-Rex 700LE Align 91H-R, T-Rex 600 Nitro Pro-O.S.50 Hyper

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11-30-2007 02:44 AM  9 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

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I don't know how the folks back at Kyosho land calculate gear reductions, I haven't seen them get one quite right yet.

The stock gear ratio of the Caliber 4 is advertised as 9.1:1.

I counted teeth the other night.

The pulley up on the clutch has 26 teeth. It is belt driven to a pulley having 50 teeth. That is a 0.52:1 reduction.

The stock pinion on the bottom of the counter shaft has 15 teeth. The main gear at the bottom of the main shaft has 70 teeth. This is a reduction of 4.6666:1.

The overall stock reduction, then, is 4.6666 / 0.52 = 8.97:1

So, the ACTUAL reduction of the stock Caliber 4 is 8.97:1 and NOT the advertised 9.1:1.

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If you're interested, by using the stock 14-tooth pinion from the Caliber 5 in place of the stock 15-tooth job, you end up with a reduction ratio of 9.61:1.

As an experiment, I've done the switch with regard to the pinion and changed my reduction ratio to the 9.61:1 value. I've not had a chance yet to test it out (darn COLD and WINDY here in Iowa right now).

I changed the gear ratio to see if I can fix the tendency of my Caliber 4 to tuck and roll (nose down and to the right) when I go to full pitch and full power). And no, it's NOT caused by a CCPM interaction. Other than this odd habit, my 4 flies quite well.

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Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-01-2007 02:12 AM  9 years agoPost 5
ecoliburger

rrApprentice

NORCAL

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Thanks, I have only flown this thing a few times but noticed the nose down tendancy as well. Gets kinda funky at high forward speed.

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12-01-2007 02:41 AM  9 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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The nose down and roll thing only happens to mine for full throttle, full collective. The heli neatly ducks its nose down and tries to roll a bit to the right.

It's as if I'm experiencing advancing blade stall. Or the 37 just runs out of reserve. After all, the 4 sports gearing for a 50, not a 30. I would hope that backing down to "30" gearing makes for a bit happier 37. If not, the next step is to search for a used MP2/30 muffler, or a more expensive new muffler for the 37.

This weekend is really supposed to suck, wind, rain, sleet, freezing rain, three to four inches of snow, up to a 1/4 inch of ice and in general, non-flying weather. Don't know when I'll get a chance to try out the new gear ratio...

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Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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