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Post by stroudj on Oct 11, 2016 0:50:19 GMT
These are air measurement.
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Post by mackattack on Oct 15, 2016 20:53:04 GMT
I am going to post my results in the Astore forum ... comments are welcomed and solicited!
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Post by stroudj on Nov 28, 2016 22:26:54 GMT
Went up to 3500 feet plus or minus, put the autopilot on level, and set the RPM's to 5600-5650. She leveled out at a constant speed, and here are a few screenshots of the speed and MAP. 113 KIAS, 122 True, RPM 5640 and MAP 32.4. Prop is set to how it was delivered, I believe in the middle at 3. I plan on pitching the prop to max cruise. Not bad for how it is now though! Yours numbers are close to what my P2008/914 does: RPM 5600, MAP 31, TAS 121, KIAS 117. My prop. is pitched at pin 4. |
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Post by mackattack on Nov 29, 2016 18:46:22 GMT
Did you guys try it at wide open throttle (WOT?) or just set the RPM to 5600?
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Post by stroudj on Nov 30, 2016 0:17:24 GMT
Did you guys try it at wide open throttle (WOT?) or just set the RPM to 5600? I set the speed to 5600 rpm. |
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Post by jetcat3 on Dec 2, 2016 23:04:46 GMT
We are consistently seeing 124-125 knots true airspeed at 5500 RPM from 4,500ft to 5,500ft. Our prop is set to position 5.
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Post by mackattack on Dec 2, 2016 23:35:50 GMT
What kind of climb rates are you getting with it set to position 5? I was not real happy with my recent prop pitch undertaking ...
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Post by jetcat3 on Dec 3, 2016 0:46:43 GMT
Gross weight with my Dad and I it's about 1200-1400ft per minute.
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Post by geobuff on Dec 3, 2016 1:13:44 GMT
We are consistently seeing 124-125 knots true airspeed at 5500 RPM from 4,500ft to 5,500ft. Our prop is set to position 5. I assume Position 5 is more of a 'speed' setting, as most folks are at Position 3. Are you over the Detent at 5500rpm, or tight to it? |
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Post by geobuff on Dec 3, 2016 1:15:24 GMT
Gross weight with my Dad and I it's about 1200-1400ft per minute. Can I assume you have it fire-walled (full turbo mode) to get that strong climb rate? |
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Post by jetcat3 on Dec 3, 2016 17:32:41 GMT
Yes, position 5 is the maximum position (coarse) set on the Sensenich. In cruise, the throttle is fairly close to the detent position but we still have some wiggle room to reach 100% max continuous power. I bring the throttle back and keep it at 5500 RPM. In climb, those reported feet per minute climbs are achieved at 115% power full detent. 1,000 fpm at 100% power out of detent.
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Post by mackattack on Dec 3, 2016 17:41:47 GMT
I may need to find someone who can do a better job re-pitching my prop. I find that after my guy used the rods and his protractor to set it at position 4, that my cruise performance seems a little worse at 5400 +/- RPM, and now it red lines to 6000 RPM at WOT. Having said that, the true airspeed is like 128-129 knots at that point... I probably need a little more feedback on what this is supposed to look like!
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Post by geobuff on Dec 4, 2016 1:11:47 GMT
I may need to find someone who can do a better job re-pitching my prop. I find that after my guy used the rods and his protractor to set it at position 4, that my cruise performance seems a little worse at 5400 +/- RPM, and now it red lines to 6000 RPM at WOT. Having said that, the true airspeed is like 128-129 knots at that point... I probably need a little more feedback on what this is supposed to look like! Yea, I thought 5800 was redline for the Rotax?  ? That means you have a very shallow pitch. You should climb like crazy. If you take more bite of the air, the WOT should come down to 5600+ It almost seems like the pitch setting is not what someone thinks it is. I don't trust the protractor method. Don't you have the wedge blocks or know where you can get some? Of course, perhaps that turbo goes by different rules. |
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Post by geobuff on Dec 4, 2016 1:18:04 GMT
Yes, position 5 is the maximum position (coarse) set on the Sensenich. In cruise, the throttle is fairly close to the detent position but we still have some wiggle room to reach 100% max continuous power. I bring the throttle back and keep it at 5500 RPM. In climb, those reported feet per minute climbs are achieved at 115% power full detent. 1,000 fpm at 100% power out of detent. Wow. that turbo is so powerful. I rode in CharlieT's Astore with the Turbo a month ago. When he kicked in the Turbo on takeoff, I was thrown back in the seat. So much more power than on my 912_is. That extra 15 hp makes a huge difference. When you throttle back to 5500rpm, your stats are comparable to the 912_is. |
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Post by MarkGregor on Dec 4, 2016 3:17:56 GMT
The reason the pitch pins were developed was to get an easier starting or point. Many ground adjustable propellors can only be adjusted by protractor.
There is no debating that a tech who is experienced with a protractor will get a better result than one using the pitch pins only. I have done the protractor method myself with an A and P watching over my shoulder and we are talking very minute adjustments.
A few things to clear up.
The 5 setting is not the max pitch setting that can be used with however it is the max pitch pin setting.
I have had many of these props adjusted partway between the pitch pin settings to get the desired result. Many times moving from one to the next goes from not enough to too much.
I believe jetcats prop is set beyond the 5 setting. I set it myself and in my opinion it is pretty spot on.
On the 914 engine the easiest way to determine if you are in the ballpark is to go up to an altitude you normally fly at say somewhere between 2500 and 4500 and set the autopilot. At that point advance the throttle till you are at 5600 RPM and note the average manifold pressure over a one minute period.
If the average is 29 inches you have a lot of cruise speed that could be gained by increasing pitch. If it is averaging 35 inches you are basically maxed out.
Mack, go do this simple flight test and let me know what you find.
Mark
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? That means you have a very shallow pitch. You should climb like crazy. If you take more bite of the air, the WOT should come down to 5600+ It almost seems like the pitch setting is not what someone thinks it is. I don't trust the protractor method. Don't you have the wedge blocks or know where you can get some? Of course, perhaps that turbo goes by different rules.