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HelicopterAerobatic FAI F3C F3N Contest › Caliber 90 Build
09-17-2007 03:09 AM  10 years agoPost 1
ErichF

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Sutton, NH

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For those here interested, but not frequenters of the Kyosho forums, here's a link to my Caliber 90 Build Thread

Any thoughts/suggestions/questions, please chime in!

Erich

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09-17-2007 07:39 PM  10 years agoPost 2
synodontis

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United Kingdom

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hey, Erich, you're tempting me and that's not a good thing.

I never knew it still kept most of the ladder frame for the 2006 design. Might want to get a kit and put it up on the shelf, but I can't do that at the moment.

The only thing I hate about the caliber is the cooling, if they adopted the curtis style fan arrangement like the Vibe and AVRO it would be so much better, I just don't see how that belt powered fan cuts it, but then again Kyosho are pretty stubborn in their design changes anyway.

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09-17-2007 08:02 PM  10 years agoPost 3
RCHelicopterGuy

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Michigan

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I dunno. Generally speaking, air doesn't like to turn corners without getting turbulent and inefficient. I can see benefits (theoretical, at least) to a fan blowing straight down on the cylinder head, especially if that fan is spinning 20,000+ rpm.

I wonder if anyone has experimented with electric cooling fans on FAI machines. It would negate the need for an engine driven fan, which means more power to the main rotor. With 4000mah battery packs, I'd think that you could still get several flights without a recharge. If battery power is a concern, just keep it on the charger between flights.

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09-17-2007 08:12 PM  10 years agoPost 4
jonesjj

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Northern IL

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Nice start to your build, look forward to seeing it all come together for you.

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09-18-2007 12:19 AM  10 years agoPost 5
Dr.Ben

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Richmond, VA, USA

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Wayne may chime in and comment on his findings when he had a brushless cooling fan in one of his models around the time of the '05 Worlds.

Pluses did not exceed the drawbacks as he isn't flying such a set up now to the best of my knowledge.

Ben Minor

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09-18-2007 01:27 AM  10 years agoPost 6
CHiatt

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Winter Garden, FL

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Cooling is fine!

I've been running the 'slow down' fan setup from Fun-Tech in my Caliber 90 for over a year with absolutely no cooling issues. The model is powered by a pumped SZ/Viper head with Hatori F3C muffler running on Cool Power 30% LS fuel. The '06 Caliber uses the same micro v-belt setup as the Fun-Tech but a slightly higher speed.

Cliff

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09-18-2007 12:17 PM  10 years agoPost 7
CCW

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SGP

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It's the same setup on my ZG gasser and the fan keeps the engine plenty happy in hot & humid conditions.

The drivetrain can potentially run much smoother w/o the fan hub in the way as well.

Another plus point is that they can have a lower profile frame.

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09-19-2007 12:45 AM  10 years agoPost 8
synodontis

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United Kingdom

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I have no experience with this model, so excuse my comments regarding it's cooling. I know that old caliber 60 had problems with its cooling so maybe the 90 had upgraded fan design to allow for this. With the 90 size does it require more cooling than the 60 size engine or less? The 90 revs lower so maybe it requires less, can't decide on this one.

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09-19-2007 03:46 AM  10 years agoPost 9
oldboldpilot

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Southern California

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synodontis,

Cooling capacity required is probably proportional to horsepower..

Helis are Man's Defiance of the Laws of Nature - OCHC

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09-19-2007 03:57 AM  10 years agoPost 10
Wayne Mann

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United States of​America

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Hi guys,

Cooling issues with a Caliber 60? This must have been with an OS. I have personally never heard anyone complain about cooling issues with the Caliber 60. I could actually richen the YS 61 up a bit and take the cooling belt off and fly the machine with no fan. However I wouldn't recommend doing it day in and day out. Now the 90 size engines are a completely different story. 90 size engines require a ton more cooling than 60s do. If I take the cooling belt off on one of my YS 91s and try to hover the machine it will be smoking hot before I even get to quarter stick. The fan in the Caliber 90 is a lot bigger and blows a ton more air than the fan in the Caliber 60.

And yes I did have a Caliber 90 at the Worlds in Spain with an electric cooling motor. At home at 600' above see level it worked great and I had plenty of run time with the extra battery. I was only running the fan at half speed in a hover. You could tell a big difference in HP coming from the YS 91. When we got to Spain at 3000' above sea level in desert like dry conditions I had to run the fan at full speed to keep the engine cool which killed battery time and left the model useless to me for the duration of the meet. Since that experience I have not revisited the idea.

I hope this helps.

Wayne Mann

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09-21-2007 03:25 AM  10 years agoPost 11
ErichF

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Sutton, NH

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Update to original post in Kyosho Forum *Pics added*

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10-23-2007 01:54 PM  10 years agoPost 12
simon109

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Hampshire UK

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Luvvvely heli Erich Great build thread

Simon.

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