Skyranger Nynja cruise speed and WOT at 5,500 rpm.

[Blueadventures]

At time people ask what is the speeds of the Skyranger Nynja so I did a video on Sunday.

 

Cruise at 5,000 rpm DUC propeller at 95Kts and at 5,500 rpm 105 knots.

 

 

 

Edited January 18, 2021 by Blueadventures

[Mike Gearon]

I was just reading up on 912 cruise RPM.

 

https://www.rotax-owner.com/en/general-tech-discussion/5812-rotax-912uls-cruising-rpm

 

Seems to be in line with what your settings are.

 

 

 

As a point of reference, I operate my 912ULS (RV-12 ELSA with 370 hours) usually @ 5,250 rpm in cruise. I will occasionally cruise @ 5,000 - 5,400 rpm depending on oil temperature/need-for-speed/etc. - I rarely, if ever, cruise below 5,000 rpm. I have set up my ground-adjustable Sensenich prop to yield @ 5,650 rpm WOT at 5,000' (my average cruising altitude) per Roger's and Van's recommendations. This gives me a nice balance of climb and cruise performance.

[Cosmick]

I also find this confusing. I read the forum above and was comfortable in my belief of cruise rpm 912uls between 5100-5400. Then I got to the last couple of comments on in flight adj setups.

Reading comments from gyro operators and they cruise around 4500 with 914's and 915's which they have for more power. Surely if you have ground adjustable you would reduce the pitch to cruise at say 5200 and have shorter take off and better climb.

Edited December 15, 2021 by Cosmick

[Hongie]

On 27/11/2021 at 6:12 AM, Mike Gearon said:

I was just reading up on 912 cruise RPM.

 

https://www.rotax-owner.com/en/general-tech-discussion/5812-rotax-912uls-cruising-rpm

 

Seems to be in line with what your settings are.

 

 

 

As a point of reference, I operate my 912ULS (RV-12 ELSA with 370 hours) usually @ 5,250 rpm in cruise. I will occasionally cruise @ 5,000 - 5,400 rpm depending on oil temperature/need-for-speed/etc. - I rarely, if ever, cruise below 5,000 rpm. I have set up my ground-adjustable Sensenich prop to yield @ 5,650 rpm WOT at 5,000' (my average cruising altitude) per Roger's and Van's recommendations. This gives me a nice balance of climb and cruise performance.

how often do you cruise at 5000'?

[Thruster88]

3 minutes ago, Hongie said:

how often do you cruise at 5000'?

Probably only when following roads😉

[Mike Gearon]

Here’s a 5400rpm cruise pushing 110kn. Quite a cross wind component. Some 30kn. 
 

Other 2 clips are landing and take off with 15-20kn tail wind on another new French island runway. Runway is an uphill one way operation due to trees, the uphill and surrounding properties.

 

 

[Blueadventures]

Nice, tail wind takeoff, you must be happy with the Nynja.  I'm doing an engine service today and re grease etc the nose wheel leg while we have some poor weather.

[Yarraroo2]

What is your procedure Mike. I thought it looks quite complicated. I thought I would like to check mine out sometime.

 

[Blueadventures]

44 minutes ago, Yarraroo2 said:

What is your procedure Mike. I thought it looks quite complicated. I thought I would like to check mine out sometime.

 

I tie the tail down (almost to the floor) [I double up on the rope tying down the tail], take out the top bolt in the fork above the rubber damper donuts; you need to remove the rudder bolt through the fork tube.  Before lifting; I back off the axle bolts so I can remove the wheel.  Clean the fork with petrol and detergent to check for any cracks; all perfect.  Then grease with lithium grease and put back in.  I have drop ins in the concrete floor that I screw in an eyebolt.  I have thick prop tape on the side of the fork to protect the paint from the spats.

 

I also fitted a new front tyre and tube the Mitas L66 from Wagga Bike and Tyres; I have new ones for the mains to do one day also. 

 

Some mates called in as I was finishing the Nose leg and I put on a cuppa.  When all finished we had a beer.   The Oil change will be done tomorrow.  

 

Cheers 

Mike

Edited February 6, 2022 by Blueadventures

[Yarraroo2]

Thanks Mike. Very thorough as usual. Cheers Nigel 

 

[Blueadventures]

Did another hour today in the Nynja; 2nd session and third flight with the newly fitted E-Prop.  Pitched decreased to 24.5* from 25*.  Turbulent air so had to get above 3,500ft for smooth air.   Happy with results.  WOT s&l 5,450rpm 108Kts.   4,000rpm - 75kts, 4,200rpm - 80kts, 4,400rpm 85kts, 4,800rpm - 90kts, 5,100 - 100kts,   I'll look at 4,800 to 5,000rpm for cruise of 90 to 95kts.  Have a two hour trip end of month to Old Station so will start seeing the actual performance including fuel usage etc and do a few local trips before hand.  Trim seems good at 95 kts will know more after some long trips. Hoping to pick up 1 maybe 2 litres per hour better economy on long trips.

 

 

 

Edited May 2, 2022 by Blueadventures
arrange images