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Series Hybrid into Plane, need help

14569 Views 39 Replies 8 Participants Last post by  DaDeemster
Hello all, after spending a decent bit of time polishing back up on my electrical knowledge i decided i'd finally move on to the public feedback stage of my plan, this is my first post On this awesome forum. I'm aware of this not being an airplane forum , but with this being the goto place for all things "electric vehicle" i figured it couldnt hurt

The objective of this build is try and find a clever way to shoehorn all the necessitys of a typical series hybrid into the plane without the plane tipping the scales, and cost effectively.

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Ok so the build is to be based in one of the following (its not important to have alot of plane backround knowledge) they are 20k and under planes with relatively a decent positive history

Sonex aircraft -http://www.sonexaircraft.com/
Pulsar Xp - http://pulsar-airplane.com/
Sonerai II - http://www.greatplainsas.com/sonerai_ii.html


**The Ac electric motors i'm leaning towards** are the Enstroj Emrax motor and the Hpevs ac51-76.
But since the Motors are comparable and the Emrax has a drastically better power to weight i'm gonna go with it (22lbs roughly) i was considering possible two so as not to stress the motor , unless new affordable alternatives have been released SO-

Emrax 228 - http://www.enstroj.si/Electric-products/emrax-motors.html

** Motor For Generator ideas** - (thinking compact, powerful (for when i need to bump the rpm's up to get the batterys some immediate juice

**This is the Dyno of a ICE motor that is slightly more powerful then it needs to be for the drive motor application -
http://www.aeroconversions.com/products/aerovee/
http://www.aeroconversions.com/images/products/HP-Torque_graph.jpg

-The motor im wanting to use to power the On Board Dc Generator is a ar741 rotary wankel motor from Uavenginesltd.com ( thier site is semi down)
i was able to find one on the internet
-i was also able to find a 30-40 horse sachs rotary motor, pull start
-i also found some running vintage snowmobiles that have the 38hp Sachs rotary motor

^^ will these motors suffice my generator power needs? direct Hp to Kw conversion wise they do even at peak torque range but is that all that matters?

Which brings me to my next dilemma, and this is where things start getting hazy- My Dc generator needs be able to directly convert as close to 100% of the rotary engine output power as possible but i dont know what dc generator make/size is best for matching it to the motors above. or if i need to run a reduction drive (i'm thinking not)

Secondly, is it really as simple as hooking the rotary to the generator and then finding a way to hold it at preset throttle positions for different charge rates
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Can it go straight from the Dc Generator to main battery terminals? and if not then what is the direct most way. Also does Generator need modifying

Also has anyone had any experience with foreign batteries? I've only heard non educated guess'. The deals are amazing and look well put together

-http://www.aliexpress.com/item/lifepo4-battery-pack-48v-55ah-electric-wheelchair-batteries-scooter-battery-with-bms-BOGO/898298740.html

-http://www.aliexpress.com/item/customized-lifepo4-60v-40Ah-Battery-pack-for-electric-vehicle-with-BMS-and-8A-faster-charger/708769853.html

And based off of someones post in this forum and the recommended voltage range for the motor i'm thinking the second battery link option would be best since its more voltage mediocre amp hourage , but since i will be so many batteries above the voltage i need to make it to run consistently so i can just enjoy the benefits of a big pack with so-so amp hours (around 180-220lbs)

Also i'd probably use the Medium- High Voltage motor controller options that they have available on thier site

But to stay in theme, if anyone has alternatives that i could use. and also thoughts on using one heavy duty controller for Dual Emrax motors. They said its not what they would recommend but i'd like to know more anyway. two motors sounds like less wear on each motor plus it would give me a instant additional power range without putting strain on a single motor. but i'm kinda confused on this . If im applying 20kw continuous from the controller to the motor will it perform the same with dual motors under the same 20kw contin' on dual motors? and if not what would be different besides more potential torque? Would i need 40kw from the motor controller to get the same desired rpms? or would the dual motors be suffice with same 20kw from the controller?

P.S i know i'm new and i pretty much wrote an article but feel free to take your guys time responding, i have a feeling i'm gonna be on this site for awhile lol
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I wouldn't make a hybrid airplane, let alone series hybrid.

Hybrid is best when the required power levels vary a lot in driving, including negative values (braking) and zero (idling). This means city driving in a car.

AFAIK, you keep relatively high and constant power levels (at good rpm range) all the time when flying so the ICE is relatively efficient. But the real reason you use an ICE in a plane is the energy density of fuel vs. energy density of batteries. Any hybridization will make this only worse.

Maybe a parallel hybrid with a small battery pack that would supply some extra power when briefly needed (takeoff?), but I cannot see series hybrid doing any good in this application.

As I have stated before, series hybrid works for cars as a range anxiety remover device by allowing longer trips every now and then, combined with a long full-electric range normally used.
AC motors can typically generate at the same power and torque as they can work as motors.
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