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HelicopterKyosho Caliber/Quest Neo-Caliber series › cal;.5 and its gear ratio????????
11-29-2005 12:19 PM  12 years agoPost 1
rpat

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Weirton, W. Va.

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A guy in my club just took a look at the specs on the 5 and he says that the gear ratio is all wrong on the machine. If the ratio is 9.6 to 1 as stated the os will be turning it's max at only 1800 rpm. To get 1900 rpm out of the engine it would have to be turning over 18,000 rpm..............that sounds like a lot of rpm and way over its power band. What do you guys think? The gear ratio in the spec sheet on Koyosho states it as 9.6 to1.
Rich

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11-30-2005 08:12 PM  12 years agoPost 2
rpat

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Weirton, W. Va.

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well I guess that no one has n opinion on this one. Stop and think about it . An example: the raptor 50 has a ratio of 8.5 to 1. Why woud Koyosho choose a ratio of 9.6 to 1. Do the math and see what you come up with.

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11-30-2005 09:39 PM  12 years agoPost 3
BosseN

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Sundbyberg, Sweden

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The Caliber M50 has 9.615:1:5 in gearratio. What I saw on the Cal 5 prototyp the maingear from M50 would fit.

I think the countergear on all Calibers are interchangeble. So you might like to fit the 90's. That will give you 7.9:1.

When I upgrade the Cal30 to 50. I also shifted the main gear to M50's. No problem with it.

BR
BosseN

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12-01-2005 01:43 AM  12 years agoPost 4
cmsilvoy

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Durham, NC

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Goodness gracious, the gear ratio debate comes to the Kyosho forum

Rich, do yourself a favor and skim through the JR forum where the 50 class helis traditionally have a high gear ratio (9.6:1)
You'll see that the dabate has been as hot as any other in the heli "theory" arena.
Fact is, the heli is a little louder and sucks a little more fuel to reach the supersonic headspeeds that today's pilots are demanding.
Nevertheless, ahigh gear ratio has never been a problem for me through a few Voyagers, a Voyager IMZ, a Sylphide 50, AND a Caliber 30 converted to a 50 (I did not reduce the gear ratio).
BUt hey, that's just me

Chris

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12-01-2005 06:54 PM  12 years agoPost 5
rpat

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Weirton, W. Va.

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cm,
Don't you feel that at say 1900 head speed that the engine is out of it's power band?
1900 x 9.6 = 18240
1950 x 9.6 = 18720
Both of those figures are high for the power band of the OS Hyper.
I think that the rpm range for the 50 is 2000 to 17000 with it making it's best power at around 16000. I know that this is all theroetical but it would seem that the engine would wear pretty quick at those rpm's.
Rich

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12-01-2005 11:24 PM  12 years agoPost 6
cmsilvoy

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Durham, NC

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Rich,
I know what you're saying.
Hence the debate.
It would be a good idea for Kyosho to lower the gear ratio so that if you wanted to run a high head speed within the power band of the 50 hyper, you could.
The thing is that there are certainly a lot of 50 class helis that run in the 1650-1900 headspeed region to perform quite well.
I guess the debate is, do you need to run a high headspeed to do what you want to do?

Chris

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12-03-2005 04:05 AM  12 years agoPost 7
Dwight

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West Chicago, IL

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I have done some extensive flying with mine and it seems to me the stock gear ratio is working very well. I am running a head speed of 1800 without any issues and the power is excellent. I have also used the YS50 and it likes this ratio even better than the OS.

Dwight

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12-03-2005 04:21 AM  12 years agoPost 8
cmsilvoy

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Durham, NC

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Dwight,
Having an "in" with Kyosho, do you know of any firm release date?

Chris

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12-03-2005 05:46 AM  12 years agoPost 9
Clayman

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Richer, Manitoba, Canada

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My 50 as of now has too much power! Will out climb my X-spec BUT just this summer I have chewed 4 mian gears. I run a GV-1 set to 1800 and the engine is running great. But about every 15 to 20 flights I chew a main gear, Usally on a hard climb. But for next summer I am going to also replace the pinion gear AS I think this is cuasing the problem, As I see the gear is showing sign of wear. Under a closer look ate the main gear I see some cupping in the gear on the power side. I wish the mesh was adjustible but not. So at this point to think 50 gear ratio is just fine. Maybe too fine.

If U Don't Fly U Don't Try

Trex 600 Pro OS50 Hyper

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12-03-2005 01:55 PM  12 years agoPost 10
rpat

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Weirton, W. Va.

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Dwight,
My issue with this gear ratio is that if you are going to do hard 3d it would seem that the maneuvers will not be as crisp at 1800 verses 1900 or higher. I am not saying that you can't do them it just seem's to reason that the higher head speed will give you more authority to do the mansuver crisper and cleaner. It all comes down to wether you want to put undo stress on the engine if you want to run at todays head speeds that everyone wants to run.
I have still put a pre order in for one because I have a cal 30 that is great and I am sure that the 5 will be the same.
Please give us some impressions of the machine. I would like to hear what you have to say, and why do they keep pushing back the release date?
Rich

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12-03-2005 01:58 PM  12 years agoPost 11
Dwight

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West Chicago, IL

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Chris,

What I do know it the Calbier 5 is on the way from Japan right now. I am not exactly sure how soon they will be here but I would take a guess that they will be available by the end of the month. Next week I can get a better date for sure.
The reason for pushing back the release at first was for making changes on prototypes. Kyosho does not want to release a kit with any problems. I know it gets people chomping at the bit but I am sure you would rather have a well designed kit without problems rather than have problems that need to be solved after the fact.

Dwight

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12-03-2005 03:36 PM  12 years agoPost 12
cmsilvoy

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Durham, NC

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Dwight,
I agree.
At this point, Kyosho willbeat JR to the line with a nice quality, good price, and high feature count 50 sized helicopter.
JR is using their most succesful ideas from the Ergo, Venture, Voyager and Sylphide models to put together a really nice model with few to no problems out of the box. Problem is, it's not available in the states.
Kyosho seems to be strengthening the 30 size machine and modifying it to accept the torque demands of the 50 sized motor.
I see very few areas for problems, save for possibly the control system. The dual MPM and CCPM system is sure to have some issues, but hopefully the choice is there for those who want it.
I, for one, felt strongly enough about push pull controls to compensate for the long pushrods- that I redesigned the frames and have a much better control system (ccpm only, however).
I'll be ready to watch how the release goes, and if there's still a place for Kyosho in this fleet, I'll be right there in line to pick one up

Thanks.

Chris

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12-08-2005 04:45 AM  12 years agoPost 13
ozace

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melbourne, australia

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Cal 5's available now and shipping from Japan. (Ishiimokei.com)
looks like it could be a fun Xmas

we can never have too many, can we ?

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12-08-2005 05:07 AM  12 years agoPost 14
dkshema

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Cedar Rapids, IA

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Word has it they hit the states December 27.

Dave

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12-08-2005 01:09 PM  12 years agoPost 15
AutoMike

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Seymour In.

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dont tease

Dang!! Thats going to leave a mark....

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12-08-2005 03:16 PM  12 years agoPost 16
hoverking

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Tennessee

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it should be in the states on or around the 27th of dec and they should ship out from california a day or 2 later

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12-09-2005 12:36 AM  12 years agoPost 17
rpat

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Weirton, W. Va.

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Chris,
What about them bringing two versions of it in the states( OS and YS), or is that a dead issue?

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12-09-2005 03:24 AM  12 years agoPost 18
RCHeliWorks

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RCHeliWorks

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from what i understand kyosho cannot bring in ys or os into the us due to contracts from other company so i think the only kits we will see are with no motor
a little birdie told me kits due to hit the us around 27 dec


chris

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12-12-2005 01:55 PM  12 years agoPost 19
rpat

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Weirton, W. Va.

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Ex,
I have come to the conclusion on this , the only way to keep the engine in it's power range is to run 1800 max head speed, but that will be ok because of the gear ratio, it will let the engine stay in it's power band without over reving. In a post up above Dwight says that he is running 1800 on his without any problems.
Now I have to start thinking about my 30 size. I don't know the gear ratio on it, and I have been runing 2000 rpm's on it in idle2. It does well but I am wondering if I am not over revving the engine. Does ony one know the ratio on the cal. 30?
Rich

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12-12-2005 02:05 PM  12 years agoPost 20
BosseN

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Sundbyberg, Sweden

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I'm not sure about the gearing. They have shiftet the gears in Cal5 from the 30. Maingear on Cal5 has only 70T. The 30 has 97T. The countergear has 14T on Cal5, The 30 has 18T.

So I don't think it is as easy to regear it as I thougt. But perhaps possible if you also shift the countergear.

BR
BosseN

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HelicopterKyosho Caliber/Quest Neo-Caliber series › cal;.5 and its gear ratio????????
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