Hank Nixon wrote on 2/9/2021 1:29 PM:
On Tuesday, February 9, 2021 at 3:58:12 PM UTC-5, Eric Greenwell wrote:
John Sinclair wrote on 2/9/2021 11:48 AM:

Eric,
Installing an electric propulsion system involves a good deal more weight than just the motor and battery weight. There must be battery cables large enough to carry hundreds of amps + controller+ motor mount+ propeller + spinner and a fire resistant battery box? Hank Nixon has made such an instillation and he said it weighed an additional 100#...........I’ll take Hanks figure!
As for “backing off of the red-line”, if you exceed the maximum weight of non lifting surfaces............your Experimental Airworthiness Certificate, contains the following.........This aircraft will be operated in accordance with the Flight Manual and maintained in accordance with the Maintenance Manual!
I’d hate to hear that read to me by an insurance lawyer in court, some day!
JJ
Was it 100 lbs for the total system, including the mast? Or just the stuff he added to the ASW24E?

Ken is using a Russia 5, which already has a motor & mast in it, so he's removing the gas
engine, and adding an electric motor - that's probably the same net weight, or less. The
batteries will add a lot of weight (maybe 30 lbs, given the Kwh Kenn wants); the controllers,
and cables with add some more, but it seems unlikely it will exceed 60 lbs.

If it's experimental, surely the owner/modifier gets to acquire a new Airworthiness
certificate, and change the flight manual to match the changes he's made in the aircraft? It
wouldn't make sense to require Hank to adhere to the flight manual for an ASW24E (gas sustainer
engine) after he's made it into an electric self-launcher, for example.
--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1

The net change for my '24E was 2 lb increase compared to condition before change, weighed without fuel.
Battery weighs 60 lb, 120V 5.75kwh.
Motor weighs 18 lb
Controller weighs 4-1/2
2 batteries in the nose. 12 lb
The 100 lb comparison I made is my 24E compared to a pure glider. This reflects the above plus structural changes between 24 and 24E as well as the lift mechanism.
UH
So, motor battery weighs 60 lbs, but what are the 12 lbs of battery in the nose? Do you
remember the motor power wire size and weight?

How was your airworthiness certificate, Flight manual, and Maintenance manual affected by the
new power source?


--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1