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After over 100 hours I finally got around to playing with Sensenich ground adjustable prop. Just grabbed the skinniest adjustment bolt and changed the prop from middle of road setting to climb. Went from 2750rpm on climb out to 2950. Climb angle is a lot more fun, slow but steep. Pulled over 3050rpm on level flight at 6000msl. Been pulling around 2850 max. Much slower airspeed and cylinder head temps quickly started to climb. Never would have believed the change it made. Spring winds are blowing here and may not get good flying conditions again for several weeks so serious testing will not happpen soon.
If anybody has done testing with UL and adjustable prop I would really enjoy hearing about results at various pitch settings.
No idea about that particular prop Ralph.
My plane came from the original owner/builder with a Catto three blade 68" x 36 pitch prop. Works good for me.
I use this little site to look into prop settings. http://culverprops.com/pitchselection.htm
Let us know how it goes. Really seems like it depends on if you're optimizing for cruise, or STOL.
Do you still have your prop set for climb? I have a stol 750 with the 350is and a little over 20 hours into
my testing. I set the prop (same as yours) in the middle (4) and the plane leaps off the runway, but It will
not cruise much over 90 mph without pushing it and raising my oil temp. I have a better oil cooler ordered
-- hoping to help on the high oil temp and plan to change the prop for more speed when finished testing.
Would appreciate any comments on the subject.
Had banjo fitting on fuel filter develop drip type leak. No love for banjo fittings here. Find myself running a finger over all the fuel fittings checking for wetness whenever the cowl is open. Oil temps of 228 are enough to get a persons attention. I do not think you are the first to upgrade oil coolers. As to the engine, I fully enjoy the fuel injection and it is pretty! I do find adjusting tappets to be a pain. Had to buy a new set of feeler gauges, it has been years since I had to pull valves covers and play with rocker arms. Just about forgot how. Buy extra valve cover gaskets. They are easy to tear. I ordered a couple of extras on regular stock order at bearings store, price was not to bad that way.
Prop settings are difficult to quantify. The heat build up at higher rpm was obvious. The steepness of climb out is harder to measure. With a flatter prop setting it seemed like I could “hang” on prop during climb out due to the higher rpms. The heat gain was such a loser for me that I changed pitch quickly. Also, cruise speed dropped enough to notice with flat pitch.
Even with the Cruzer, 1500’ would be enough runway most days. Some days I just find myself coming in high, fast, and long.
Summer heat is finally here. With OAT in the 90’s and oil temps pushing 120, I find that I am much more interested in the results of your oil cooler change-up. I would appreciate it if you publish your new oil temps and post a picture of your new oil cooler.
Took my wife out the other evening with temps still in the low 80’s and contrasting terrain, she did not appreciate the fun ride provided by the thermals.
I will be glad to do that and I have the new cooler, but have decided to wait until the 50 hour inspection.
Don't ask me why (because it makes no difference), but my goal is to have my 40 hrs. of testing completed by July 19 -- that's the day I picked the kit up at the factory last year. I told some of my
friends it would be a piece of cake getting it done. WRONG. Anyway, I am only flying it at sunrise
in cooler temps. and have 9 hours to go.
Yeah, very few women like the bouncing around. I live in KS and am flying to Oshkosh on Monday
in the Warrior, coming back the same day and I'm sure the ride home won't be fun......