Farfles Electric Ultralight.

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Farfle   1 MW

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Re: Farfles Electric Ultralight.

Post by Farfle » Oct 13 2019 6:05pm

Hillhater wrote:
Oct 13 2019 5:13pm
Farfle wrote:
Oct 13 2019 11:43am
Heya all! Back at it! I finally got the courage, time and energy all lined up to open up the wing after the snow damage it sustained last winter. ...
... ?? :shock: .. whoo ha !.. what happened there ?....did we miss some “event” ?


Sadly nothing epic or anything, it got snow damaged by some snow sliding off the roof that I couldn't see was up there (21ft ceiling commercial building)
Test Review Revise Repeat

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Farfle   1 MW

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Re: Farfles Electric Ultralight.

Post by Farfle » Oct 30 2019 3:39pm

Big news all, the belite is going to the dark side...

The Airframe is just not a good electric conversion candidate. Compared to Gabe's Gull, this takes almost 2x the power to cruise at the same speed.
As an electric plane that means really short range, in this case only about 50 mins of flight at a measly 55mph. Once you take away some margin because airplane things, that gets me an out-and-back range that's not really good for doing more than just flying the pattern.

So, I had been delaying fixing the snow damage from last year thinking about small tires, faired wing struts, wheel pants, converting the wing to in-wing ailerons etc... when an almost brand new Rotax 447 practically landed in my lap. So, one top end rebuild later, and its conversion to the dark side will be complete.

Damage pulled apart:

Imagedamage 2 by Jackson Edwards, on Flickr

Imagedamage by Jackson Edwards, on Flickr

Fixed!

Imagefixed 2 by Jackson Edwards, on Flickr

ImageFixed by Jackson Edwards, on Flickr

On to the teardown. The electric system uninstalled fairly quickly, I forgot how much time I spent connectorizing the harness, and it sure made things easy. Only a few HV wires had to be cut as there were connectors on opposite ends of bulkheads that were not able pull through.

ImageBelite teardown by Jackson Edwards, on Flickr

Imagedogbatts by Jackson Edwards, on Flickr

Imageslotax by Jackson Edwards, on Flickr


The Rotax is a good bit longer than the Electric drive was, and the cooling fan pulls from the back, so I can't stick it tight to the firewall. Ill probably have to make some changes to the cowl. Here is the engine mount design so far:


Imagemotor mount by Jackson Edwards, on Flickr

Imagemotor mount ISO by Jackson Edwards, on Flickr

ImageMotor mount one side by Jackson Edwards, on Flickr
Test Review Revise Repeat

helno   1 W

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Re: Farfles Electric Ultralight.

Post by helno » Nov 05 2019 4:30pm

There is real irony of an electric airplane being converted to gas but good on you for building something, testing it and realising that it doesn't match your use case.

Got any plans for the electric drive train?

Hillhater   100 GW

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Re: Farfles Electric Ultralight.

Post by Hillhater » Nov 06 2019 5:11pm

helno wrote:
Nov 05 2019 4:30pm
Got any plans for the electric drive train?
Worlds fastest ground tug ??
This forum owes its existence to Justin of ebikes.ca

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neptronix   100 GW

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Re: Farfles Electric Ultralight.

Post by neptronix » Nov 06 2019 6:13pm

Sad that you had to move to gas. Solid state batteries can't come fast enough.
"Love and compassion are necessities, not luxuries. Without them, humanity cannot survive." - Dalai Lama

My first major build: 1.6kW 8T MAC motor on a Trek 4500.
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Whipper-snapper: ? on a lightweight BikeE Semi Recumbent

Grantmac   10 kW

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Re: Farfles Electric Ultralight.

Post by Grantmac » Nov 06 2019 7:16pm

At what battery energy density do you think it will be a viable option?

ScooterMan101   1 MW

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Re: Farfles Electric Ultralight.

Post by ScooterMan101 » Nov 06 2019 11:45pm

First I am seeing this thread , Farfle once you have enough fun in this aircraft with the petrol engine the way to use your electric drive train is on a very efficient airframe ... a Sailplane or as near to a Sailplane as possible. ( I have been up in a few of them and they glide very good so they would make a good electric plane ) Or another clean aerodynamic plane . I have been out of the Skies for about 20 years now so I am not up on the latest small aerodynamic planes or even hybrids of Rigid Wing Hang Gliders and a Ultralight , there are a few of them . Another possibility is the Dragon Fly Hang Glider Tug Ultralight . It was designed for very good climb rates and can be made cleaner for better L/D ratios .

Neptronix , Solid State Batteries ? where is the link to them ?
neptronix wrote:
Nov 06 2019 6:13pm
Sad that you had to move to gas. Solid state batteries can't come fast enough.
My first conversion ... Sold

viewtopic.php?f=3&t=71378&p=1077497&hil ... 1#p1077497

It's 2018 already, ( now 2019 ) lets get some real , improved e-bike / e-velomobile / e-motorcycle designs .

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