Sunday, August 10, 2014

Long Neglected Mosi Motorglider Project is Going Electric!!

For those of you having shown interest in my Mosi project, please excuse my neglect of it and the feeble level of progress seen over the last few years..
My workload has been very heavy, and I loaded myself with other projects, like the SWIFT ultralight glider.. which I just sold, by the way... it was an awesome wing, but my 61-year-old body foot-launching a 140-pound glider on a regular basis proved to be impractical, and there was no well-sorted-out power package available, and there were no suitable ultralight towplanes in this area.
So the SWIFT turned into yet another non-flying project that was yet another drain on my spare time & scant resources.
It seemed like a better plan to liquidate the SWIFT and refocus efforts & funds on the Mosi project.

On the Moni powerplant front, the long-since out-of-production KFM-108 engine had its day.. people are steadily migrating away from it.. due in no small part to the lack of factory support.
Other 2-stroke engines (Rotax-447 etc.) have been successfully used, but they are now out-of-production as well .. it's only a matter of time before support for them are gone too.
And my hope to build a 4A032-based 4-stroke power plant for the Mosi .. while certainly plausible .. began to loom large as time & money pit .. far too life-consuming for a one-off aircraft effort, and also with diminishing parts & tech. support..

In the the last few years, a lot has changed .. particularly improvements in electric propulsion technology.
It is suddenly is looking a lot more promising for the Mosi and similar aircraft!
Model aircraft have undergone a rapid electric revolution in a big way.
Instant power availability, low vibration, no exhaust disposal or fuel storage/delivery issues, CG flexibility, etc.. certainly, there are drawbacks too, such as low duration/range, and high up-front costs, but it's getting better very quickly.

So, I've decided to go ELECTRIC !!  no more gasoline!
But YIKES!! Now I have to learn about a whole new world of rapidly changing technology.
You all probably know of Randall Fishman's admirable electric power adaptation of the Moni a few years ago, under his Electraflyer moniker.
http://www.electraflyer.com/electraflyerc.php
I've talked with Randall, and he has a lot of impressive experience & knowledge about it.
He's making a commercial go of it, trying to sell his flight-proven batteries, controllers, chargers, motors & airframes.
His prices are kind of steep, but not that bad if you consider life-cycle costs.
Do-it-yourselfers on a tight budget are scared off.. and some are trying to adapt RC hardware to do the job .. with mixed results... cheap stuff usually works, but not for long, and the life-cycle cost of Giant-scale RC hardware probably ends up being worse than quality Electraflyer components in most cases .. but I have very little data to go on.. and new products & suppliers are coming & going almost daily.. impossible to keep up.

So, I'm going to bury myself in studying about motors, batteries controllers, chargers.. etc. etc. for a while, then go buy some hardware and start testing it.

As always, your comments and advice are welcome!