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HomeAircraftHelicopterKyosho Caliber/Quest Neo-Caliber series › Your opinion on the 9.6:1 gear ratio of the Caliber5
02-12-2006 01:45 PM  12 years agoPost 1
helirulz

rrVeteran

Singapore

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Well guys...contemplating to get one within the next few days..so happened that im torn between the C5 and the raptor50Se

Im really hoping to get the C5 cos of its GREAT PRICE of below 300USD (490SGD here in singapore)
What's holding me back is the fact that the raptor dominates 95% of all helis here in singapore...oh well...
I have only seen a caliber30 2 times in my entire life

Parts support for kyosho here in singapore...im not entirely sure about that. I'll have to check up on that. Parts cost will definately be an increase over the raptor but hey! I dont really care!

Now comes design 'flaws'.
I would really be interested in hearing peoples' feedback on the caliber's 9.6:1 gear ratio.( i.e. How it affects performance and flight characteristics)
And i would like to know what RPM you guys are running?

Oh yea...and i would like to know the upgrades available for the C5...and their prices. I hope it isn't as high as Hirobo's ones

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02-12-2006 06:58 PM  12 years agoPost 2
steve9534

rrKey Veteran

yakima, wa.

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Gear ratio
The gear ratio depends on the motor, but 9.6:1 is probably a lot closer to being the "right" ratio for best power than 8.7:1 or whatever it is the R50 has. The reason that ratio has become popular is because the R50 needs to turn 1900-2000 Rpm head speed to get the t/r turning fast enough to hold during 3D. The t/r gearing is numerically lower than ideal, so the compensation is to have a numerically low main gear ratio and scream the thing. It's not the best arrangement. Awaiting the flames from all the happy R50 owners who "never had a problem with their t/r holding power". steve.

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02-12-2006 07:18 PM  12 years agoPost 3
spaceman spiff

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Tucson

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Happy R50 owner here! --- CWRRRRRRRRRRT CWRRRRRRRRRRRT (flame thrower sounds) Are you crispy yet?


Well actually there is some truth to what you say, I put trimmed down 60 tails on mine. The standard 30-50 size TR are just don't have quite enough authority, however i do like the 1850 - 1900 RPM for other reasons. Would like to have the option to have lower gears on my Cal5, but haven't flown my new Cal 5 yet (engine arriving tomorrow), so i reserve judgement for a few weeks.

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02-12-2006 07:25 PM  12 years agoPost 4
Clayman

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Richer, Manitoba, Canada

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Well my Caliber 30 conversion has the 9.6 gear ratio and has more power than any raptor I have seen. I see no problems with the gear ratio and I am using a O.S 50 Hyper. Whitch will go into my caliber 5 as soon as it arrives.

If U Don't Fly U Don't Try

Trex 600 Pro OS50 Hyper

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02-12-2006 07:25 PM  12 years agoPost 5
spaceman spiff

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Tucson

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V2 blades?

edit: nevermind, found em.

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02-12-2006 11:10 PM  12 years agoPost 6
Santiago P

rrProfessor

South West, Ohio

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The reason that ratio has become popular is because the R50 needs to turn 1900-2000 Rpm head speed to get the t/r turning fast enough to hold during 3D. The t/r gearing is numerically lower than ideal, so the compensation is to have a numerically low main gear ratio and scream the thing. It's not the best arrangement. Awaiting the flames from all the happy R50 owners who "never had a problem with their t/r holding power".
Another happy R50 owner here:
I HOPE YOU BURN IN HELL FOR SAYING SUCH THINGS! I am just kidding Steve.
I have not heard the weak t/r explanation before, but i agree with you. NHPs tail blades helped a lot. The other reason I run the R50's m/r like I stole it goes to what steve9534 said. The 8.6 ratio needs 1950 to 2000rpm to put most 50s on the motor's sweet spot of 17000. Because of the stresses caused from the 2K rpm, I try to use lightest blades I can find (135gr of less).

I believe the 9.6:1 is still too high, being one who thinks 9.0:1 is ideal for 3D type flying. I had a Venture 50 which I re-geared from 9.8:1 to 8.8:1 resulting in a much lively heli for 3D.

I am not passing judgment on the C50, and I am interested in all your findings on how C50 performs in hardcore 3D flying. I have no doubts that it is a solid and stable machine, but will it be the hot rod (with the right setup) Great Planes advertises?

Santiago

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02-13-2006 01:50 AM  12 years agoPost 7
Dwight

rrApprentice

West Chicago, IL

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I have been flying the Caliber 5 for several months and have found the 9.6 to work very well. I originally ran 1750 head speed for the first month. This worked very well. I have recently raised it to 1850 and 1900 and find no significant improvement other than more noise. I do prefer a smoother 3D style so the lower head speeds are much more conducive to this style. I can fly at full throttle sideways and do loops without any issues of the tail holding so if this is a point of concern you need not worry. The Cal 5 has a strong tail.
Currently there are no option parts but they will be coming in the future. You really need to fly the machine first to see that you don't need to spend money on option parts. In the standard format the machine seems to be very well configured.

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02-13-2006 05:00 AM  12 years agoPost 8
Santiago P

rrProfessor

South West, Ohio

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Thanks Dwight,
Good to hear from you.
I am more conducive to as much cyclic responce I can get a hold of, to sometimes compensate for my lousy ability in learning 3D. I can easily compesate whaen I fly a slower head, but it is not as fun. Can the head be made a bit "snappier" with lighter, quicker paddles, or by changing the mix ratio without a major mod?
An expert opinion likes yours is well apreciated.

Santiago

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02-13-2006 02:07 PM  12 years agoPost 9
Dwight

rrApprentice

West Chicago, IL

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Chago (I think that would be the spelling),
I like your runryder name.

The Cal 5 has 2 settings on the mixing arms. The stock setting is the less agressive setting. If you want to make the machine more snappy you certainly can change the paddles. The blades on these 50 as pretty light anyway so paddles are about the only option.

Dwight

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