Ultralight Engine Options

[mrbarry]

http://www.woelfle-engineering.com/Produkte/produkte_XFXH40rotaryengines_en.html

[mrbarry]

the polini is a cart engine . there a lot of different cart engines .
here is the one i am looking aat now xf 40 rotary [wankel type] 294 cc 31 hp weighs 25 kg with the radiator ,w/o the redrive.
i am wondering about the fuel usage .
i do know they make a little nicer sound than the traditional single piston
http://www.woelfle-engineering.com/P...ngines_en.html
optimized for endurance use. The engine has high-temperature ball and roller bearings to further improve its excellent emergency running properties, additional vents allow almost unidirectional mounting, and the autoventilated V-belt pulley keeps the drive belt cool.

[mrbarry]

bump

ultralight engines

[cluttonfred]

If I were tackling a new ultralight design in 2014, I'd base it on one of the proven 25-30 hp paramotor engine packages and do absolutely nothing to it, just bolt it on a pusher design and go. The Cors-Air (JPX Italia) Black Devel M25Y is one and there are others.

Sandlin Bloop 2


Italian Zigolo Ultralight

[zaitcev]

Zigolo costs as much as Aerolite 103, which is much better. Zigolo is basically a motirized GOAT.

[Jim Heffelfinger]

The XR-50 rotary engines have been tried for our planes by Phantom - http://www.phantomaero.com/ Owner had a whole blog on the conversion and trials. Testing memory - he had issues with the main bearing loading to the redrive. These are cart engine - tightly tuned and a completely different loading curve to aircraft.
New configuration with derated power and more/better bearings might be worth a look. Just because Rotax has reduced their product line doesn't mean the segment of aviation use doesn't have options.
J

[mrbarry]

i am attracted to the wankel type engine because of the reduced vibration and the +exhaust note+

contraindications would be the high initial cost and the high rate of fuel burn. the 5 gal limitation on a Part 103 compliant thus endurance.
perhaps a goal of an N number and a Sport Cert is in my future , that would allow more fuel AND a full cockpit enclosure.
[humm , Can i get an N number with un certified engine ? }
listen to this exhaust : not like the scream of the Hirth F33 which is the other COTS engine on my A list

[mrbarry]

i am a little bummed out , LSA regs part [ please supply] specify a speed [120 knts]at maximum continuous power , ul [part 103 ] specify full power and 55 knts, i think i , as an old rule reader will squint real hard and interpret full power as max cont pwr ..

WOT [wide open throttle ] on these engines im looking at is 6000K rpm , max continuous is abt 75% or 4500 rpm . .. makes a difference do not you know , i doubt i would go to WOT on take off thrust [OTHERS WOULD]
for consistency in rule making the power settings should be the same through out the classes

i think i should be able to operate at Vno [normal operating] [75% pwr] specified as 58 mph on my selected airframe VICE WOT & 55knts [wazzit 63 mph?]
then again i ran the numbers on AC 103-7 appx 1 with the 28 hp hirth and a full faired enclosed cockpit and was good. , have not run the numbers with the XF40 31 HP max. . highly unlikely i can fabricate up a fully faired enclosed cockpit and meet the 254 lb empty weight [dry] AS REQUIRED BY PART 103

i think part 103 should allow for full faired ENCLOSED cockpits , all i really want is a high lift low drag motor glider good wing. , 55 knts at max cont pwr, 5 gal fuel [ ok ok ]
something with a l/d of.. 28+ .. Vne up to eh 150 knts ., . like the clip i posted on another string , catch some lift up to 18K .. [be sure and take your OXY bottle]

[martymayes]

i think part 103 should allow for full faired ENCLOSED cockpits ,

Is there anything specifically prohibiting an enclosed cockpit on a part 103 ultralight?

I've seen a skypup with an enclosed cockpit which still had #30 unused lbs for meeting part 103 requirements.

[mrbarry]

Is there anything specifically prohibiting an enclosed cockpit on a part 103 ultralight?

no , its just the weight limits, by the time one builds a good strong wing , has an adequate crash cage and hangs on 5--60+ lbs of engine there is not a lot of weight left for faring..
skypup is cute https://groups.yahoo.com/neo/groups/Skypup-club/info

here is an example for the well heeled ,

http://windward-performance.com/spar...pecifications/

+5 /-4 , l/d 37/1 Vne 123 knts ,Empty Weight – 155 lbs

i have seen motor glider tests with this airframe & a Hirth F33 [45 lbs w redrive & electric start]
it is all kevlar and carbon fiber.. fixed engine pylon .