C201 337 approval for Franklin

n2020u · Post by **n2020u** » Sat Mar 29, 2014 9:59 pm

Just ran across this post.. I have the 82" Mac on mine; didn't see any limit on the approval and it was field approved in Moultrie at MauleFlight( need to double check that) with 7.00 x 6's as it had the wheel fairings. BUT I do pull it back to 25 squared by the end of the field; it's the neighborly thing to do as there are no obstacles in San Jose! She is noisy though; here's a vid taken by a friend.

Take care,
Garrett

http://youtube.com/watch?v=s4XTwEA3IT0

gulf200 · Post by **gulf200** » Mon May 19, 2014 9:45 am

Does anyone have the angle the 82" prop should be set to?

I am only getting around 2500rpm on the ground and want to send the prop off to a shop to get the low pitch stops adjusted.

1 shop said about 1 degree per 100 rpm. The other shop wanted to know what degree I wanted it set to and if I could find that for them.

Just curious what others have done. 220 franklin with 82" McCauley

aero101 · Post by **aero101** » Mon May 19, 2014 11:44 am

They're all a little different based on how fresh / tired the engine is... Flatten it out about another 2-3 degrees should do it for you... Also verify that governor is backed off all the way to allow prop to contact stops... If you're a little high on RPM adjust governor to catch it, but I'd try to keep it within 10% of redline in case governor fails you don't get a run away prop. I'd also check your tach calibration with a tach checker to make sure that your tach is accurate as they are quite often off a hundred RPM or so at top of range? It's somewhat normal not to make redline statically, within 100 RPM would be good as it'll make redline during takeoff roll...

gulf200 · Post by **gulf200** » Mon May 19, 2014 9:43 pm

Thanks Jim.

From talking to the first shop I was thinking 3 degrees, but haven't checked the calibration yet.

I'm excited to get this prop doing what it is supposed to.

vaughans · Post by **vaughans** » Tue May 20, 2014 1:34 pm

Just had an 82" Mac done by Northwest Propeller Service to go on my M4220C Maule. Set low pitch to 9.5 degrees from 13, .310 spacer was changed out to .175 to acheive the change. Have not installed prop yet, waiting to paint before installation. They have done quite a few these for installation on the 220 Franklin. Hope this helps as this question seems to come up from time to time.

Vaughans

gulf200 · Post by **gulf200** » Tue May 20, 2014 2:53 pm

vaughans wrote:Just had an 82" Mac done by Northwest Propeller Service to go on my M4220C Maule. Set low pitch to 9.5 degrees from 13, .310 spacer was changed out to .175 to acheive the change. Have not installed prop yet, waiting to paint before installation. They have done quite a few these for installation on the 220 Franklin. Hope this helps as this question seems to come up from time to time.

Vaughans

Thanks for the numbers. That helps a lot.

Mog · Post by **Mog** » Tue Mar 20, 2018 5:00 pm

Ok, so how big of a difference is the 82â€ Mac on the franklin in all honesty. I get the impression itâ€™s a big difference, but can anyone quantify that?

1:1 Scale · Post by **1:1 Scale** » Tue Aug 07, 2018 11:33 am

Would anyone be willing to share a copy of their 337 for the 82"? I plan on replacing my 78" C201 with an 82". I've got 8.50's and will be installing the extended gear, so clearance shouldn't be a problem, but would like the least restrictive approval I can have, if possible.

Thanks!

Mog · Post by **Mog** » Thu Oct 25, 2018 1:09 pm

Just reposting the below question. As I have the option for a new or used/rebuilt C201 available to me at the moment. I have had to many times where I have bought expensive items with the promise of great things only to be disappointed. So how great is the C201 on the Franklin.

Ok, so how big of a difference is the 82â€ Mac on the franklin in all honesty. I get the impression itâ€™s a big difference, but can anyone quantify that?

firstmaule4 · Post by **firstmaule4** » Thu Oct 25, 2018 1:32 pm

Come down to Uvalde Texas and fly my M4 with a 201 prop then make up your mind

Mog · Post by **Mog** » Thu Oct 25, 2018 7:16 pm

Appreciate the offer. Not sure when I can fly that far south. But I will let you know. Did you fly yours with the C22 first?

FARMAULE · Post by **FARMAULE** » Fri Oct 26, 2018 4:28 am

Mog, when I swapped the 22 for the 201 I wasnâ€™t overly impressed with the Takeoff performance however it is better. I was hoping for some drastic changes. The biggest thing you will notice is pulling the engine to idle on final. Your airspeed will bleed off so much faster. It really is like using a speed brake if you have ever used one in a different airplane. This allows for very steep approaches which for me significantly shortened my landings. I would recommend the 201 and would do it agin knowing what I know now. I used Vaughnâ€™s stop setting numbers above and make rpm just fine. Hopefully this is somewhat helpful. Oh and itâ€™s loud very loud at 2800rpm.

stick_rudder · Post by **stick_rudder** » Fri Oct 26, 2018 5:02 am

Mog,

If your on wheels, and extracting every ounce of performance out of your plane isnâ€™t a hard requirement, then sticking with the C22 is a good option to save $$. I flew my plane for 2 years with the C22 on floats and wheels then upgraded to the C201. Biggest difference is on floats, would hate to go back to the C22 for floats. For wheels, much harder to discern the same performance improvement though I know I did gain performance. Good advice would be to fly a plane with the bigger prop.

Mog · Post by **Mog** » Fri Oct 26, 2018 6:42 am

I have tons of drag from tires gear and shock struts, so I have far more drag than most people. If it doesnâ€™t turn it into a rocket otherwise then I may need to reassess. Guess I need to get in someoneâ€™s plane to figure it out. Hate to spend a bunch of money on a â€œ Meh feelingâ€.

FARMAULE · Post by **FARMAULE** » Fri Oct 26, 2018 9:04 am

Sticks-Rudder, I donâ€™t know anything about float ops but Iâ€™m curious what the 201 affected positively in your float ops and why you lose the benefits or at least not feeling them when going to wheels? I figured it would be about the same. Thanks

C201 337 approval for Franklin

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