Thanks again for posting the video on the XTM 5500 twin motor
setup. Since then I’ve had two flights on it with good results and will share
more in the future. There was lots of interest in the carbon ehelp that I
briefly showed in the video so I’ve compiled a bunch of videos in a somewhat
disorganized overview and posted some flights on ayvri.
I’ve also open sourced all the design files, bill of materials, etc. All the
links are below as well as a comparison table of the Soarmaster, Carbon ehelp
and XTM 5500.
On a tangent the day after flying the ehelp conditions substantially improved
and John Simon, Jim Messina, Ric Neuhaus and I made a 96k attempt to fly from
around Chestertown, MD to Dewey beach. We all made it within about 5-15k of
goal, flights on ayvri here: https://ayvri.com/scene/z15yrzn1jx/ckc101cj90003286lk95ii7l1. Chris
Bruno was there but wasn’t able to go on task.
Carbon ehelp specs:
Weight = 22lbs
Thrust = 30 kg estimate
Flight time = 20min
Altitude gain on full charge = 1,250 (145 Falcon 3)
Climb rate = 300-400 fpm 100-200 fpm as battery voltage sags
Batteries = 12s (2x6s) Tattu 25Ah HV
Current draw = 162 amps
Cost <$2,500 (parts only, includes batteries, chargers etc.)
