The International Cessna^® 170 Association

I had an MDM7649 on my '52 170B/edo 2000s for about 50 hours, quite a bit of clenching on the smaller lakes. I've had an 80x40 for over 10 years and would never go back. It drops the cruise to 93-95 mph, but takes full advantage of the 145 hp on take-off. I've let Sedan owners try it on their seaplanes and they all converted . I got the STC from Kenmore, then bought a new one. At the time it was about $800 more than used, which were very hard to find.

can 8040 be used with wheels legally? i have a 172 fravel tail wheel with 180 gear. is the 8040 heavier than stock prop? i am looking for climb performance. i dont take long trips. whats the best prop for the least ground roll?
tg

3454terryg wrote:can 8040 be used with wheels legally? i have a 172 fravel tail wheel with 180 gear. is the 8040 heavier than stock prop? i am looking for climb performance. i dont take long trips. whats the best prop for the least ground roll?
tg

Yes... The STC for the 8040 is available from Kenmore Air Service and it's legal for the 170. I have one on my 170 as do many Ak operators. It's the best fixed pitch prop for takeoff... Cruise is leisurely.

I've got the 8043 on my '53 B Model, and really like it. Cruise is acceptable (105-108 mph) and climb is good. I have a 650' strip that I fly out of at home occasionally.

Joe

3454terryg wrote:can 8040 be used with wheels legally? i have a 172 fravel tail wheel with 180 gear. is the 8040 heavier than stock prop? i am looking for climb performance. i dont take long trips. whats the best prop for the least ground roll?
tg

Be careful. We don't know what engine you have in that 172. 6 or 8 bolt crank? The 8040 prop these guys are using would be an 8 bolt prop.

Does the Kenmore STC require 180 gear?

Is the Kenmore STC for the 8040, 8042, 8043?

Bill

flat country pilot wrote:Does the Kenmore STC require 180 gear?

Is the Kenmore STC for the 8040, 8042, 8043?

Bill

And in 345terryg's case it would have to be for a 172 or he's out of luck without separate approval

3454terryg wrote:can 8040 be used with wheels legally? i have a 172 fravel tail wheel with 180 gear. is the 8040 heavier than stock prop? i am looking for climb performance. i dont take long trips. whats the best prop for the least ground roll?
tg

Hi,

I have a 172 with the Fravel conversion. I also have the 1A175DM8042 propeller. You will need a field approval to use it legally. I bought the STC from Kenmore to include with my field approval data package and had no trouble getting a field approval. There is no landing gear requirement per the STC. My airplane has lady legs and has plenty of ground clearance. There is a version of this propeller for the 6 bolt cranks and it is on the type certificate for the later model 172's that were approved for floats. I would guess that a field approval for that set up would be just as easy to get. It is a bit heavier than the stock propeller but you can expect an increase in climb performance of around 300 fpm and a loss of cruise speed of around 15 mph.

The Kenmore 8040 prop STC SA111NW is for Type Certificate A-799 applicable to the C-170A and B land and seaplanes and requires a Cessna spinner 05550162 on a C-145 or O-300 A&B engine. The prop is a McCauley 1A75-DM with a max diameter of 80 inches and a minimum of 78.4 inches subject to a limit of 2,700 rpms. There is no pitch specification in the stc but ranges from 8040 to 8042 seem the most common.

pdb wrote:... Cruise is leisurely.

Best description ever.

pdb wrote:
... Cruise is leisurely.

Best description ever.

Well, who doesn't want just a little more time in the plane.
It's still faster than a J3.

David would you be interested in trading for my 54 pitch prop?

I finally did it and bought the 80-42 propeller! It's not on the plane yet and will repost on how it performs!

Thanks everyone for there input!

How did I miss that post above? (I'm guessing I'm the Dave that ignored you)

Congrats on the 8042. I'm really looking forward to hearing your impressions.

So I have had the 8042 climb prop on my plane for 9 months! It has been the best addition I have done to my plane. The biggest difference I have noticed is the initial run up. It puts you back in your seat.... "a little" at the begining of the take off role. With the old 7654 prop it just seamed to slowly get going down the strip. I cruise at 95 kts TAS and see no reason to put the old 7654 back on. I also installed the Gar-Aero 8.5 X 10 wheels to give the prop adequate clearance! With 400lbs of pilot and co-pilot and half tanks I can usualy get up around 400 feet at sea-level! this makes me