The International Cessna^® 170 Association

Showboatsix, My brother-in-law has a Ford truck, (van)?, just like yours in his back yard shed. If I'm not mistaking part of the right-side panel folds down for access to the bed of the truck. Jon

Ford Econoline PU did not have a fold down side, but Chevrolet Corvair did have that as an option on their forward cab. Corevair had a dual skinned side, Ford is a single wall skin. (Remember Hoss Cartright hitting the bed side of the Corvair and saying... "look Ma.... no dents")

Yup, your right. Hadn't seen it in a while, and forgot it was the corvair. Still kind of a neet old van. Brings back memories of "the Lil Red Wagon", wheelie van. I think that is what it was called. It's hell getting older. At least only the memory is the first thing to go ! Jon

Hey Showboat........
You obviously have the tools and the expertise and the place to work, are you thinking of giving your ole 172
some more power ??? .....0-360 Lyc. maybe, or something more exotic ??

Just wondering.............

The best thing you can do for a 170 or 172 with the 0-300 is throw away that cruise prop and pitch it to a climb prop less 10%, the less 10% +or -is the propeller shops FAA tolerance for a pitch. Mine is 51 inches less 10%, I can just make 2700 level flight full throttle, so less pitch would over speed. With the Sportsman STOL kit on I have plenty of vertical speed available and as for horizontal speed......... "well SPEED and 170/172 are not used in the same sentence."

My engine is a 500 hr since complete OH with ECI machine works and Millennium cylinders.

Are you sure that's not 1% , ....5" of pitch plus or minus seems like quite a bit.
or am I missing something?

That 51" prop at a -10% would be about 49". That's pretty thin on a standard diameter prop used in anyplace other than the mountains. Sure as hell wouldn't make the TDCS. I'm not saying that it wont work because I've seen them pitched lower than that where the flying was up in the high mountain country and serious climbing was the primary criteria.

According to "Western Propeller", the 10% is in degrees of pitch and not in inches, the props are pitched to a certain degree angle at particular locations along the length of the blade, the 10% figure is in degree angle at those locations, so I don't think it is as low as 49" vs. 51". They say the FAA tolerance is 10% +-. So I went with the lower side of tolerance and static RPM is ok.

That makes more sense.......here I was scratching my head and doing all that math fer nothing.

Now.....anyone got any idea what 51" of pitch equates to in degrees ?? (ballpark is good )

I think in theory that at cruise or maybe full throttle that idealy the plane should go that distance forward in a single revolution of the propeller. But then you have to go back to the static RPM and figure if it is in specification to the TDCS, and all that good FAA stuff, or just bolt it on and go fly, since I had a Yellow tag from the prop shop, that's what I did 10 years ago!

Jimmy M. wrote:That makes more sense.......here I was scratching my head and doing all that math fer nothing.

Now.....anyone got any idea what 51" of pitch equates to in degrees ?? (ballpark is good )

McCauley uses the average section angle at the 30" station for describing a particular pitch. For the 1A170 (DM7651) prop (this would be the standard, original prop on a 170 that had a pitch of 51")... the Angle at station 30 would be 15.3-degrees.

For the later props, the model 1C172 (which would be the MDM 7651, or the EM 7651) it would be 15.2-degrees.

I don't see any comments about 10% in the McCauley overhaul manual. The pitch tables state: "Tolerance -plus zero, minus 0.2 degrees."

Whatever the books says is NOT important to me, I have a Yellow tag from the prop shop, the prop works good, the plane flies great, and the FAA will never know what the hell is in front of them when they look at my black prop with yellow tips!

So I will continue to fly it like it has been for another 10 years like I have done for 10 years!

Black prop with yellow tips?????............Black prop with yellow tips ???????
them FAA guys gonna see that and ground yer butt.............

everybody knows that black props is supposed to have WHITE tips...

Not so... See link below..... The standard tip color is red, however you choose blue or yellow.

http://www.cattoprops.com/html/propeller_tips.html

ALSO: McCauley Met-Al-Prop Repair and Maintenance Handbook, dated 2-15-55 says specifically:

14. Finish

a. If the repaired propeller is to be used in the vicinity of salt water, it shall be anodized.

b. The face side of the blades shall be painted with a non-specular black lacquer for glare elimination.

c. The tips shall be painted with red, orange, or yellow lacquer.

Showboatsix wrote:...ALSO: McCauley Met-Al-Prop Repair and Maintenance Handbook, dated 2-15-55 says specifically:
...The tips shall be painted with red, orange, or yellow lacquer.[/b]

Whatever happened to:

Showboatsix wrote:Whatever the books says is NOT important to me,..!