Anything over 86mph seems fast to me Pete!That full throttle speed at 2700 rpm of 105 mph seems slow to me. Are you on 35" tires? Do you have slats?
My 180 hp does 120 mph at 2700 rpm..... on floats. The prop is the Whirlwind 200G.
Anything over 86mph seems fast to me Pete!That full throttle speed at 2700 rpm of 105 mph seems slow to me. Are you on 35" tires? Do you have slats?
My 180 hp does 120 mph at 2700 rpm..... on floats. The prop is the Whirlwind 200G.
That full throttle speed at 2700 rpm of 105 mph seems slow to me. Are you on 35" tires? Do you have slats?
My 180 hp does 120 mph at 2700 rpm..... on floats. The prop is the Whirlwind 200G.
That full throttle speed at 2700 rpm of 105 mph seems slow to me. Are you on 35" tires? Do you have slats?
My 180 hp does 120 mph at 2700 rpm..... on floats. The prop is the Whirlwind 200G.
Those speeds on the Borer seem extremely slow even if expressed in knots. I run a cut down 81/43 Borer on a 160 hp modified J5, which feels like really a climb prop rather than cruise and I get 105-110 mph or around 95knots at 2450-2500 albeit with 8.50 tires. The figure in the table of 79 at 2400 with a coarser prop and bags more power must point to some outrageous drag.
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82/43 on a 160hp PA-18 rigged PERFECT plus the Thrust Line mod and I get 92 mph at 2400rpm. Same everything else and I get 102 with my 74/56 Cruise Prop. Gave up on Cato years ago and can't wait for the adjustable, and yes I've got one reserved.
I just checked on my prop order which at the time I was given 5-7 weeks to ship. I was just told this morning it would take another 3 weeks. So my guess is it a 10+ week from order to shipping. I did get the spinner and had it painted and ready for adjustable prop delivery. Pretty excited to try it out.
Night and day difference. I made up a spread sheet for the local dealer who was involved in the testing and certification flights and we compared A LOT of different planes doing same day testing with the original prop on the planes then the Sensenich GA prop at various settings. Every single plane (not just cubs) showed significant improvement on take off, climb and cruise speed. On my 160 HP pacer I was over 48% shorter on take off times (17.7 seconds with 82X44 to 9 seconds at 34") on skis with a solid ice runway and better climb/cruise.
For what its worth, After a lot of testing I turned down one of the higher pitch pins that I can't use to give me a 35" pin and the 150/160 engine seems to like this pitch the best. At 34 I can turn it up and get the best take off time, but cruise suffered a few MPH. 35" and we seem to get about 1-2 seconds longer take off, but a few MPH faster than the 82X44 borer.
I have switch back to BW so I need to run the tests again just to see what the #s are on BW versus skis. The difference was enough that after testing the demo prop, I bolted my 82X44 back on for 2 flights then went and plopped my CC down and walked out the door with the new prop and I have never looked back.
Another benefit of the CF prop is instant spooling and better throttle response when your dragging it in.
I have said it before many times and I will say it again. If your running a mechanical tach have it check using an optical or digital tach. I have yet to see one that was not 150-250 RPM LOW on the top end so when your mechanical tach says your turning 2500 chances are your closer to 2300. I thought I must have had the world strongest 160 narrow deck till I checked the tach out. FWIW the optical and digital tach on the EM are within 1-2 RPM of each other.
Interesting! The devil is in the details. Thank you.Just finished up my Recurrent DER training today and had a class on the new Part 23 regulations. Of note is that the Sensenich STC SP04490AT was issued under these new regulations. For all you guys that are thinking of using this STC, read the limitation section carefully if you have more than 2 seats in your Cub! The STC reclassifies the PA-18-150 (specific serial numbers as modified with 180HP engines) as a Class 1 low speed aircraft as defined in 14 CFR 23.2005. A Class1 aircraft is one with a maximum seating configuration of 0-1 passengers. If your airplane has more than 1 passenger seat, this STC is not applicable to your aircraft. Under 23.2400 paragraph (b), only Class 1 Low Speed aircraft can have the engine and propeller certified as part of the airframe (the approach Sensenich used for this STC). Just figured I'd throw this out there before someone paid $7k for a prop they can't use legally.
A lot of guys were asking about the possibility of putting this prop on Short Wing Pipers. Until Sensenich goes for a TC on the prop rather than just a PMA, all the short wing Pipers with more than 1 passenger seat are out of luck. Maybe some pressure needs to be put on Sensenich to actually go for a TC rather than just PMA. I know lots of folks that would but these props if they were legal to install.
This is the STC SP04490AT for installing the Sensenich ground adjustable prop on certain PA-18-150s which have been modified to use the Lycoming 180 hp 0-360 or IO-360. https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/9053fb048f04e38f862586b8004a6f0c/$FILE/SP04490AT.pdf
In reading the limitations, if the -18 had previously been modified for a third seat I would make a note on the 337 and in the log book that the third seat approval was no longer applicable while this propeller was installed.
This is the STC SP04490AT for installing the Sensenich ground adjustable prop on certain PA-18-150s which have been modified to use the Lycoming 180 hp 0-360 or IO-360. https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/9053fb048f04e38f862586b8004a6f0c/$FILE/SP04490AT.pdf
In reading the limitations, if the -18 had previously been modified for a third seat I would make a note on the 337 and in the log book that the third seat approval was no longer applicable while this propeller was installed.
If an approval were to be pursued for a suitable PA-12, it would be simple enough to limit the passenger seat to just one passenger.
Same procedure, place a two seat limitation on the airplane. Remove the back seat.Agreed, remove the 3rd seat STC. How about the 4 place wide fuselage, no way around that that I can see.
Sure, unless otherwise modified. This is an STC. There isn't anything that says an STC can not mandate the removal of some other item.Don’t think that would work on the PA-12, the TCDS clearly identifies it as a 3 place airplane for both land plane and sea plane.
That would take a Field Approval or a model change as the 1953 PA-18A was a PA-18A-135. I'm currently dealing with the same issue for a 1953 PA-18A-135 and the instal of the WipAir 2000 lb. gross weight increase. That STC is also specific to a PA-18-150. Whats interesting about the Sencsenich STC is it does not include PA-18A-150's or PA-18S-150 models. This should backlog the FAA field approval process about 3 years.checking to see if prop can be installed on a 1953 pa18A S/N 2495 with CC 180 hp stc installed