A Kamov Ka-26:
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Sunday, December 22, 2019
11 comments:
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Amazing little helo, π
ReplyDeleteCouple of questions...
ReplyDelete-Why the bladeless runup?
-Is it a good idea to line up a critical, high-load joint by hammering the bolt?
-Do piston engines still have a role in helicopters?
Very cool little bird. Your video made me go find out more about them, thanks for the Sunday morning education.
ReplyDeleteDeadstick,
ReplyDeleteThey certainly do. Piston-engined helicopters are used for training, light transport and for photography platforms, among other things. A R-22 is less than $300K, a R-44 is under $500K. To compare with turbines, a new MD-500 (think Magnum, P.I.) is well over a million. Probably the cheapest turbine is a R-66, which is almost a million bucks.
Deadstick, tail rotors are necessary to cancel torque from the main rotor. The coaxial (stacked double) main rotors are self cancelling and eliminate that need. It's a signature Kamov design element.
ReplyDeleteYou stole my thunder. But I would add the Enstrom F28. I think they're still in business up in Menominee MI.
ReplyDeleteOne has to wonder how clean the sheet of paper was when they designed it. Possibly got it mixed up with some
sort of septic tank transporter, and remembered they still had to turn in a helicopter design by 500pm.
bmq, I know about the coaxial rotors, but why the runup with no blades on it?
ReplyDeleteObvious that that bird hadn't been started in a while. Probably checking to see if the transmission had been reinstalled correctly. Had an up close view of a KA-27 once, when they popped one up off the Kirov to keep us from rigging the ship... That pilot was @#$# CRAZY!
ReplyDeleteSeafury, I forgot about the Enstrom F28. Bit more pricey than a R22, at $370K. The Brantly B2B filled a similar role, but they may be out of production.
ReplyDeleteRobinson pretty much owns the training marker.
Good question, Deadstick. Never considered that before. Maybe the extra control surfaces help with low speed/high maneuverability situations like crop dusting? The seem to provide a convenient mounting location for equipment in some of the variants but I'm guessing that wasn't the original purpose. Perhaps they just couldn't stomach making something that looked as ludicrous as a tailless ka-26 would?
ReplyDelete@ Deadstick:
ReplyDeleteAt the 6 min mark in the vid, the pilot tests rudders by putting them over to rotate the chopper.
A windtunnel view of just what is going on there would be interesting. It does not look as if, being stationary, there ought to be much air being blown across the tail rudders in the front-to-back direction.