Farfles Electric Ultralight.

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craneplaneguy
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Re: Farfles Electric Ultralight.

Post by craneplaneguy » Dec 04, 2017 9:26 pm

All the reports I've heard on the stuff is positive. The only bad, those skilled in conventional aircraft coverings have to keep in mind it's different in a lot of ways. Not more difficult, just different then working with ceconite etc. Some don't like the partial see through of it, the air frame may be somewhat visible against a strong light, big deal, it's the lightest way to go, the no painting is a bonus. Great choice!

adapt2entropy
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Re: Farfles Electric Ultralight.

Post by adapt2entropy » Dec 10, 2017 12:21 am

Nice project Jackson. I've had 2 flights this fall on my powered hang glider with the zero drive train, but now it's too much like winter on this side of the 49th, and that gives me time to improve my data display and recording. Are you using the analogger to go with the CA? watch out, it's not rated for over 100v, and I proved that!
I only got 20 minutes flight time, used 50 Ah from 2 packs. This trike has wide tires and is more of a cruiser, seems to want 10kW to maintain level flight. My first e-trike was on a soaring wing (slower) and seemed to maintain with 7kW. I haven't played with prop settings yet. Nice reduction unit you built, I was able to get one from Thundergull.
Can't help but say, you look crunched in there in that narrow fuselage, so less drag, but then it's given away with the big tires .. if I had 4 batteries I won't care either! bubble doors could be an option some day down the road (that doesn't sound like airplane talk)
My last ice plane had pre-sewn dacron covering, and people called it the transparent plane if I flew overhead on a bright day. It was a crowd pleaser, but being an ultralight you don't get many positive remarks from the conventional pilots.
regards

craneplaneguy
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Re: Farfles Electric Ultralight.

Post by craneplaneguy » Dec 10, 2017 10:16 pm

As a former hang glider and ultralight pilot, though now a fixed wing "conventional" pilot for the last 28 years or so (though experimental/homebuilt category) I HATE to hear some spam can Cessna pilot denigrate flex wings of any type, and I always call them out on it! They may not know my past flying history,.....The real good fixed pilots, with lots of experience, DON'T bad mouth other pilots of any ilk, it's the guys trying to build themselves up. Yeah, Farfles, you have two strikes "against" you : it's an ultralight and it's electric! I can hear the jokes now "what are you going to do when the battery runs out?" The same thing sort of happens in the hoisting business, I operate a 30 ton crane, and SOME guys running a 100 ton or bigger laugh when I call myself a crane operator, the same type of dip stick who would look down on an ultralight as not a real aircraft! If it gets you high enough to kill you, you are for sure a real pilot! Back to your construction thread, rant over.

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Farfle
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Re: Farfles Electric Ultralight.

Post by Farfle » Jan 01, 2018 5:49 pm

Making more progress!

The race bike:
24s5p 50c nano tech
Badass custom mofo outrunner 205x177mm 26kv
Peak power in : 420A at 87v
Peak power out: 34 Hp and 105ft/lb

Build to last...
"It will be assaulted by the elements, It will be ravaged by time and it will be destroyed by the user. BUT, if you Stick to the little rules: K.I.S.S., Overbuild everything, and test, review, revise, repeat. It will last"


Team Farfle blog!! http://www.farfleselectrics.blogspot.com

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jonescg
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Re: Farfles Electric Ultralight.

Post by jonescg » Jan 01, 2018 9:19 pm

I'm going to an event tonight where the company will be unveiling Australia's first electric aeroplane for commercial use - the Pipistrel.
I'll take heaps of photos :)

PS Love watching this build unfold :)

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Farfle
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Re: Farfles Electric Ultralight.

Post by Farfle » Jan 01, 2018 9:22 pm

Pipistrel makes some phenomenal airplanes! Hopefully they did an OK electric system. Thanks for taking lots of pics!!!
The race bike:
24s5p 50c nano tech
Badass custom mofo outrunner 205x177mm 26kv
Peak power in : 420A at 87v
Peak power out: 34 Hp and 105ft/lb

Build to last...
"It will be assaulted by the elements, It will be ravaged by time and it will be destroyed by the user. BUT, if you Stick to the little rules: K.I.S.S., Overbuild everything, and test, review, revise, repeat. It will last"


Team Farfle blog!! http://www.farfleselectrics.blogspot.com

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jonescg
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Brief interlude of Farfles Electric Ultralight thread.

Post by jonescg » Jan 02, 2018 7:54 am

Beautiful little aeroplane!

350 volt (96s) battery - 4 x 5 kWh units in parallel (air cooled).
20180102_183621.jpg
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EMRAX motor, liquid cooled.
Pipistrel's own inverter, also liquid cooled.
1 hour flight time with about 30 mins in reserve.
350 kg total mass.
Rocket propelled drogue 'chute for poopoo time.
20180102_181756.jpg
20180102_181756.jpg (210.48 KiB) Viewed 310 times
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20180102_174057.jpg
20180102_174057.jpg (213.78 KiB) Viewed 310 times
Video of it spinning up here:
Last edited by jonescg on Jan 02, 2018 7:29 pm, edited 1 time in total.

craneplaneguy
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Re: Farfles Electric Ultralight.

Post by craneplaneguy » Jan 02, 2018 9:55 am

A very nice low drag airframe, sexy looking too. "If it looks right, it probably flies right."

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fechter
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Re: Farfles Electric Ultralight.

Post by fechter » Jan 02, 2018 2:54 pm

Just park it facing into the wind and use the prop as a wind generator.
"One test is worth a thousand opinions"

helno
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Re: Farfles Electric Ultralight.

Post by helno » Jan 02, 2018 6:16 pm

Pipistrel makes a nice plane.

They are selling them up here in Canada already.

Unfortunately the LSA rules specifically say that an LSA must have a single reciprocating engine. Someone was a bit shortsighted when they wrote that rule.

craneplaneguy
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Re: Farfles Electric Ultralight.

Post by craneplaneguy » Jan 03, 2018 9:06 am

Ha, it looks weird to see no kick back when they shut the thing down, it just smoothly winds down like a turbine. Just one of my bush tires has as much drag as that entire air frame, but them again I land places (and take off again) that thing could only land once! Still, that is a really cool plane.....

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Farfle
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Re: Farfles Electric Ultralight.

Post by Farfle » Jan 19, 2018 2:11 am

Making more progress. The flaperons are done, the flaperon hinges are done, the control cables are hooked up, the pitot tube is plumbed and the cap strips are done but not yet on. All it needs now is the correct tailwheel spring rivets, some more AN hardware to replace some temporary hardware store bolts, brake mounts, brake plumbing and the brake pedals. Then covering and its ready to fly.

Image20180117_130042 by Jackson Edwards, on Flickr

Image20180117_130131 by Jackson Edwards, on Flickr

Image20180117_125957 by Jackson Edwards, on Flickr

More pics:
https://flic.kr/s/aHsmcG4C1h
The race bike:
24s5p 50c nano tech
Badass custom mofo outrunner 205x177mm 26kv
Peak power in : 420A at 87v
Peak power out: 34 Hp and 105ft/lb

Build to last...
"It will be assaulted by the elements, It will be ravaged by time and it will be destroyed by the user. BUT, if you Stick to the little rules: K.I.S.S., Overbuild everything, and test, review, revise, repeat. It will last"


Team Farfle blog!! http://www.farfleselectrics.blogspot.com

craneplaneguy
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Location: S.E. Idaho USA

Re: Farfles Electric Ultralight.

Post by craneplaneguy » Jan 20, 2018 11:00 am

Oh man, the excitement builds! That thing just looks right, nice and conventional in general layout that is. Your biggest thing is the usual, getting to know how a taildragger handles. If you haven't already, get some tail dragger time, NOT flying it but ground handling/taxiing it. One great example of how they handle as compared to tricycle gear, is take a standard grocery cart and push it down the aisle and jump on. With the small pivot wheels in front and the fixed behind, it will continue to track more or less straight. Then take that same cart, (already loaded with can goods from the previous test) but turn it around, then push it as fast as you can and jump on (you'd be jumping on the front). The difference is directional stability will be obvious (CLEAN UP IN AISLE 6), books have been written about the art of flying (they fly the same, taxiing is the trick) a TD. I just say all this as it would be a shame to see your project grounded by a plain old garden variety ground loop. The thing should land slow enough, so that the first time you have a cross wind to deal with, cheat. I do all the time, angle across the runway, no need to nail the while line down the center, hell land on a taxiway if you have to, not bending it is more important then busting a rule, especially at a small out of the way strip. Conventional pilots may frown at this, but they won't be in your shop with you helping to repair it, so screw them, other then obviously not endangering others, do what you need to keep it in one piece.

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Farfle
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Re: Farfles Electric Ultralight.

Post by Farfle » Jan 20, 2018 1:01 pm

I have started flight training in a C172 (that i might have the opportunity to purchase), but recently got to ride backseat in someones PA-18 and practice weaving on the taxiway. I corellated it to driving a forklift quickly, it works better backwards :) , its just too bad that the thing needs to take off forwards!

I am going to be re-designing the rudder pedals on this plane after that experience, as right now they are way too fragile and hard to manipulate for the abuse I will be putting on them. Also getting brakes set up on the main gear will help a ton with ground handling, as the piper at slow speeds just kind of went where it wanted unless you gave it some brake pressure. Its been an exciting learning process.

James was able to make several landings in his belite in under 100 feet, so that gives a pretty wide range of landing angles on a 120ft wide runway :).
The race bike:
24s5p 50c nano tech
Badass custom mofo outrunner 205x177mm 26kv
Peak power in : 420A at 87v
Peak power out: 34 Hp and 105ft/lb

Build to last...
"It will be assaulted by the elements, It will be ravaged by time and it will be destroyed by the user. BUT, if you Stick to the little rules: K.I.S.S., Overbuild everything, and test, review, revise, repeat. It will last"


Team Farfle blog!! http://www.farfleselectrics.blogspot.com

craneplaneguy
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Location: S.E. Idaho USA

Re: Farfles Electric Ultralight.

Post by craneplaneguy » Jan 21, 2018 12:26 am

James was able to make several landings in his belite in under 100 feet, so that gives a pretty wide range of landing angles on a 120ft wide runway :).

That's exactly what I'm talking about!

That 172 time will be pretty worthless other then for building time, The Cub better, but a J-3, Aeronca, or T-Craft would be better yet, the lighter the better. I like the fork lift analogy.

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