Back Kaman K-225
1949

Kaman K-225

Open frame three-seat utility helicopter developed from K-190 with Kaman twin rotor system and provision for agricultural twin hoppers and dusting system. Powered by one 225hp Textron Lycoming O-435-A2 piston engine driving wooden main rotor blades. Prot. N404A. 7 built. One aircraft for USAF as H-22 (s/n 50-1271).

R.Simpson "Airlife's Helicopter and Rotorcraft", 1998

Kaman K-225

Technical data for K-225 with a gas turbine

Rotor diameter: 11.58m, length: 7.01m, height: 3.35m, empty weight: 816kg

Kaman K-225

Comments 
jack brady, jack.brady39=yahoo.com, 10.02.2014

We watched this type helicopter for years in the Phoenix area being used as crop dusters on cotton crops. Most amazing maneuverability! I have unfortunately, no pctures, and am searching for some. Any available would be appreciated! The choppers were painted orange there.

Steve Dodge, 08.02.2012

I was curious as to how YAW was controlled without a tail rotor? A coaxial system just varies speeds between the two rotors, but this cannot be done with Kaman's intermeshing rotors.

shoes, chianpeson=yahoo.com, 15.06.2011

and we were wondering how the second propeller does not hit against the first.

Sean Kinkade, thopter=directairnet.com, 24.05.2009

The rotors do not hit each other because they are geared together and positioned and timed so they always miss each other, plus each rotor mast is angled so each rotor passes over the other rotor head. From a front view of the machine you would see the rotor masts are canted outward.

Samori Augusto, samori [underscore] augusto (at) hotmail, 24.02.2009

Does anyone happen to have video of the K-226 in flight? I took my kids to the Air & Space Museum in VA, and we were wondering how the second propeller does not hit against the first.

Michael McElligott, mlmcelligott=gmail.com, 13.09.2008

hi there, im a mechanical engineering student and for our computer aided design module (CAD) we have been given the task of modeling a gas powered helicopter. im interested in modeling this helicopter, the kaman k-225 because it was the first to be gas powered and because of its simplicity it would be easier to illustrate all the moving parts, engine and drive train and how they all move together. do you know where i could get good blueprints of this helicopter? thanks

HOBART WILCOX USCG RETIRED, HOBIE.87=VERIZON.NET, 26.08.2008

I WAS THE CREWMAN ON THIS HELIO AT THE 50TH ANNIVERSARY OF FLIGHT AT KITTYHAWK,NC,I ALSO GOT TO MEET IGOR SIKORSKY,THE USCG P[LOT WAS CDR JACK WEBER,WE CALLED THE HELO THE FLYING CHECKSTAND.PLEASE CONTACT ME FOR ANY OTHER COMMENTS, H WILCOX

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