Michel LT Posted June 14, 2020 Posted June 14, 2020 Hello. I have had an e prop on a Nynja. The factory had 3 options climbing, in between, and cruise option. I choose the middle way. The prop was quieter, and giving a a greater torque. I didn't get much in cruising speed. It needed a lot of right rudder at take off. Unfortunately a friend crashed my plane on a go around after only 50 hours. He had used that plane before a few times and should have reacted with enough right foot but he clipped a tree on the go around, destroyed the plane but survived. That was the end of the Nynja and the e prop. Of course he blamed the prop ;-) A friend of mine who run a flight school in Zanzibar recommended the prop, he has been using them for years and swear by them, all on Rans aircrafts. The has just re done an engine at 2000 hrs, the engine was in excellent condition. He puts that on the lightness of the prop. If you wish. I can give you his email. Oh by the way, I got the savannah S after the pay off from the insurance but it came with a Duc Flash, so far so good, but difficult to get more than 5200 at take off on my 5600 ft alt home strip. If you ever put an e prop please tell us how it goes.
Kyle Communications Posted June 14, 2020 Posted June 14, 2020 Thanks for the report Michel I am expecting the first trial prop to be sent later this week. I cant believe how much interest there has been on them. They are literally unheard of here certainly in my circles but apparently not in the Microlight guys they certainly know them and a few have them. I can see a reasonable size order going over I think if they pan out ok. Even if there isnt a reasonable performance increase just the vibration and noise factor could make it popular
M61A1 Posted June 15, 2020 Posted June 15, 2020 Hi all, I first used a Eprops 3 years ago..on a Savannah . 5600 on takeoff 5500 on climb 5600 full power level flight VERY smooth and low inertia at engine stop . After, I ordered mine for my CT ,but first used it on a CH601 . More efficient than the Warp Drive previously installed, a bit better than the Kiev , . Ii recommended on our 'CT forum' and you can read all the comments here http://ctflier.com/topic/4988-new-propeller-for-ct/?tab=comments#comment-73293 read my 'report' about the test results on the amphib Kitfox much more efficient than the Whirlwind. alos, sold one to a customer for his SkyCruiser....replacing his Sensennich... so, far,, everybody is happy, and nobody used the ''6 months satisfied or return '' my 2 cents Do you have any comparison on the CH601? I swapped from a three blade Warp Drive to a two blade Sensenich and it was a big improvement on a CH601HD.
Kyle Communications Posted June 15, 2020 Posted June 15, 2020 Looks like I might have to send you the test prop Mick to see how it compares...you dont have a prop extension do you?
M61A1 Posted June 15, 2020 Posted June 15, 2020 Looks like I might have to send you the test prop Mick to see how it compares...you dont have a prop extension do you? No extension on mine.
Kyle Communications Posted June 15, 2020 Posted June 15, 2020 When we have tried it on Danny's and mine and then Rogers....he doesnt have the extension either I will get it t you so you can have a play and see what its like Danny spent all day yesterday chasing his vibrations.. he used new Bolly blades also a differt prop extension and he did a static balance and then used my dynavibe to get it the best he could..he says its a lot better..certainly best its ever been but still vibration there so it will be a good comparison with this new prop 1
M61A1 Posted June 15, 2020 Posted June 15, 2020 When we have tried it on Danny's and mine and then Rogers....he doesnt have the extension either I will get it t you so you can have a play and see what its like Danny spent all day yesterday chasing his vibrations.. he used new Bolly blades also a differt prop extension and he did a static balance and then used my dynavibe to get it the best he could..he says its a lot better..certainly best its ever been but still vibration there so it will be a good comparison with this new prop Sounds like he needs a gas turbine. Is his vibration worse than anyone else's?
Kyle Communications Posted June 15, 2020 Posted June 15, 2020 certainly before it was but now probably about the same as most of us with such a long heavy extension. I think he got the vibration down to 0.07 on the balancer was the best he could do. Have a new bracket now too made out of high tensile alu and pickups are redone. The accelerometer is now directly behind the optical pickup dead at 12 o'clock so the backet should be more solid and we get better readings
facthunter Posted June 15, 2020 Posted June 15, 2020 Ya gotta know when you are getting good vibes.. Nev
M61A1 Posted June 15, 2020 Posted June 15, 2020 certainly before it was but now probably about the same as most of us with such a long heavy extension. I think he got the vibration down to 0.07 on the balancer was the best he could do. Have a new bracket now too made out of high tensile alu and pickups are redone. The accelerometer is now directly behind the optical pickup dead at 12 o'clock so the backet should be more solid and we get better readings It's not airframe related is it? I had some funny sounds coming from the back originally and it was sheer arse that I found it was thin sheetmetal vibrating in turbulence off the canopy at certain AoAs. Some VGs on the canopy sorted that.
Kyle Communications Posted June 15, 2020 Posted June 15, 2020 No its not airframe definately engine..before the compass on his dash was vibrating now it doesnt..I think the main issue was the heavy alu prop extension
facthunter Posted June 15, 2020 Posted June 15, 2020 You are adding another unknown with an extension. How much runout and how elastic is it? Extra potential load on the redrive bearings and structure and engine mounts.. Nev 1 1
Kyle Communications Posted June 15, 2020 Posted June 15, 2020 The extension is supplied in the kit for the savannah Nev...just so happens we have a few between us. But that could be the biggest source of vibration due to its size and weight. Danny weighed the Sav extension with the bolly hub and blades and spinner I think it was close to 6.5 or 7kg..the Eprop version with their all carbon extension and blades and spinner is less than 2.5kg 1
skippydiesel Posted June 15, 2020 Posted June 15, 2020 How long since the engine/frame mountings were checked/replaced ??
Kyle Communications Posted June 15, 2020 Posted June 15, 2020 Not that long ago..he thinks they may have been too soft..he has a new set of them to put in this week but they are harder
Amphibman Posted June 15, 2020 Posted June 15, 2020 I do not think there is a "draggier" aircraft than a SeaRey - with all the bits and pieces hanging off it - its like flying a Landrover with a full roofrack. The e-prop that I have now has certainly made a difference as I stated. I am not trying to sell the e-prop to anyone - just stating my experience with having flown it for about 7 months. The three main differences that I noticed is increased cruise speed at less revs - Some might say this is due to the pitch setting - but I am also getting a less takeoff distance and climb rate. Second it is very quite - to such an extent that people actually have commented about it - this could be because I have the four blade offset prop which has a different resonance in the pusher configuration. The notable lack of vibration is not due to any balancing that I did to it, but could also be a contributor to how quiet it is. I consider the biggest plus for a SeaRey, which are notorious for there aft CoG sensitivity would be the weight saving of almost 5 Kg back of the CoG. Like I say -not trying to sell it to anyone but if some one wanted to take it off me I would fight them off with a stick.... 7
Kyle Communications Posted June 16, 2020 Posted June 16, 2020 Confirmation the prop has left the factory last night...maybe here early next week and we can test it the following weekend
Kyle Communications Posted June 16, 2020 Posted June 16, 2020 UPS says next thursday delivery so weather permitting should have some "real" numbers on the weekend. Will probably do a couple of videos as well when assembly and testing ..will post on youtube 1
eightyknots Posted June 17, 2020 Author Posted June 17, 2020 UPS says next thursday delivery so weather permitting should have some "real" numbers on the weekend. Will probably do a couple of videos as well when assembly and testing ..will post on youtube Please send the links when you do.
Kyle Communications Posted June 22, 2020 Posted June 22, 2020 Well Hank you will be please to know the Eprop arrived this afternoon. The blades are certainly not what we are used to seeing at all. The spacer is pretty cool. You will need to remove the bushes from the drive plate of the engine by the look of it too Will post some pics later tonight. Will test it this weekend.
facthunter Posted June 22, 2020 Posted June 22, 2020 Well It's obviously a weight saver . Let's see how she goes? Nev
eightyknots Posted June 22, 2020 Author Posted June 22, 2020 Some pics [ATTACH type=full" alt="IMG_8688.jpg]54228[/ATTACH][ATTACH type=full" alt="61450106097__9C9F3794-66BD-452A-8B46-4CAFA7C2B001.jpg]54231[/ATTACH][ATTACH type=full" alt="IMG_8689.jpg]54232[/ATTACH][ATTACH type=full" alt="61450104191__7144A814-CBE1-40D1-BFCF-41014D551CEA.jpg]54234[/ATTACH][ATTACH type=full" alt="IMG_8687.jpg]54235[/ATTACH][ATTACH type=full" alt="IMG_8692.jpg]54236[/ATTACH][ATTACH type=full" alt="IMG_8686.jpg]54230[/ATTACH][ATTACH type=full" alt="IMG_8693.jpg]54233[/ATTACH][ATTACH type=full" alt="IMG_8690.jpg]54229[/ATTACH][ATTACH type=full" alt="IMG_8691.jpg]54227[/ATTACH] ☆ Definitely very different!! I hope it works well on the Savannah.
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