The International Cessna 170 Association

Where can we get some of those cylinders? Very cool.

Arash,
The next time you visit the Hiller Museum, how about taking a picure of the "Boeing Condor (displayed above)" as is mentioned on the display card of that engine. I'm curious as to what the "Boeing Condor" was.

Does the Association have an STC for that in the 170's yet??

I just did an Internet search - there is a Wikipedia entry with photo from that museum.

I don't understand the accessory case on that engine. I think I'm seeing a couple of coolant pumps where magnetos (at least!) should be. Where do the mags get driven from?

Arash,
Thanks for the links to that airplane. I had never heard of it before. It must have had some magnificent super chargers to get those engines up to the
67,000 ft. altitude that is reported. It sure dosen't seem like enough power to fly an airplane of that size, especially being capable of an amazing top speed of some 235 MPH. I wonder how much it weighed?

It just doesn't seem possible to me that they could even get a 20,000 lb. gross weight airplane off the ground with two 275 HP engines, let alone up to a stratosphereic altitude.
A Cessna 175 with four big people and a foll load of gas at only about 2,500 lbs. has to struggle on a hot day on half that power.

If those engines turned at 2700 RPM, I wonder how they reduced it to turn a 16 ft. prop and what the reduction ratio had to be. Sixteen foot props would have to turn pretty slow to keep the tip speed down to a usable speed.
A good many people fail to realize that just about all engines over 400 HP have reduced drives to the propeller shaft.
I remember that the R-3350 engines on the B-29 turned at 20 to 7. Those props were 16ft. , I believe.
When the engines were making 2000 RPM, the props were turning at 700. I think most of the engines on Gooney Birds ran at about 16 to 9.

Aryana wrote:BL, empty weight was 8000 lbs with gross weight at 20000 lbs. how it got up to 67k feet, on two 175 hp turbocharged engines seems amazing to me.

Instead of green chromate they used RED OXIDE primer.

http://www.boeing.com/history/products/ ... hicle.page

Thanks for the pix. I don't believe I ever heard of that project. It's really a helluva BIG airplane!

Aryana wrote:I guess that big 200' wing and 16' diameter props must have made all the difference.

Some aircraft with wings like that have climbed to 50,000 feet without any engines at all!