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12-04-2011 09:36 PM  5 years agoPost 1
smiggsy

rrNovice

Northampton. U.K.

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Hi Flyers,

I have Robbe Magic mechanics with an O.S.60 in a Robbe Hughes 500E.
I'm about to fit a Revlock. Without having to remove the mechanics, which is a real pain, does anybody know what the gear ratio is?

Barry

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12-05-2011 12:24 AM  5 years agoPost 2
trillian

rrVeteran

London, UK

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I think the original Magic had a 10 to 1 gear ratio.

The revlock is calibrated for engine RPM though, unless you're
going to rig up a series of magnets on the main gear (I have seen
this done with a Trex 500 ! ).

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12-05-2011 12:28 AM  5 years agoPost 3
Wemo

rrApprentice

Hampton Roads, VA

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Hello,

The gear ratios depend on the 1st stage (count clutch bellT and gear (42 or 48T then divide) and 2nd gear stage (count main gear T to pinion gearT then divide). Multiply the ratios together to get the final gear ratio.
http://www.rcmarket.org/Manuals_Hel...rive_ratios.pdf

"How high do they go? Are those things hard too fly? How much do they cost?

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12-05-2011 04:19 AM  5 years agoPost 4
dela

rrApprentice

Stillwater Oklahoma

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Mark the clutch bell with a felt tip pen.
Rotate the head exactly 1 (or 2 or 10) revolution, and carefully count the number of revolutions of the clutch bell. Divide clutch bell revolutions by head revolutions, and you have a very good estimate of the gear ratio. More head revolutions and care in counting means better gear ratio estimate.

No math required unless counting and/or division is math. To me, mathy things aren't really math until you hit algebra. : )

Ron

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12-05-2011 05:46 PM  5 years agoPost 5
smiggsy

rrNovice

Northampton. U.K.

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Thanks guys,

The engine fan already has the magnet installed. I've fitted the sensor and the Revlock senses it.

I know how to work ratios out, but as I said in my post, I didn't want to remove the mechanics. I can see some of the gears but not all of them.

Yeah, I may have to go the felt tip pen route.

Do you think a head speed of 1500rpm is a good starting point?

Barry

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