Timber 110" Twin Build

[RC80AK]

Sorry hope I not being a nuisance, looking at your gear you have a nice small chamfer on the legs how did you do it.

https://www.amazon.com/gp/product/B001A0Y9HE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 This bit works awesome on aluminum in a small router table. If you do, BE CAREFUL. A bench sander and a steady hand or even a good file will get you close.

 

[RC80AK]

Last weekend I did some power/thrust testing of the scorpion 4035-250 motors and hit a couple snags. I'm not getting near the thrust numbers listed, and the Graupner E-Props are experiencing some kind of blade resonance. Scorpion has some very elaborate charts for their smaller motors, and I've found them to be extremely accurate. The chart listed on site with the motor above appears to be fiction.

Prop options are limited in counter rotating pairs. APC has a decent selection of electric "pusher" props, but I haven't found them to be very efficient.

I'll do a little more testing, but I'm considering going with four 4020-630. I have a lot of experience with this little motor and an interest in exploring the push/pull configuration with brushless motors. You lose some efficiency but it is a setup that is used in the heavy lift drones to achieve redundancy with minimal structure.

Time to do some testing to see what kind of thrust/noise this setup will generate!

 

[Snoopy1]

With a four motor set up like that how many ESC do you need.

 

[RC80AK]

With a four motor set up like that how many ESC do you need.

I would run 4 Edge Lite 100s. It would be nearly 400amp draw at full throttles on 5s

 

[RC80AK]

Success! I threw together a quick test stand out of some wood scraps, door hinge, and a luggage scale. The setup runs smooth. I'm getting around 13lbs static on a single motor, 23-24lbs on the pair inline. The Twinber is now Timber XL-4!I'll start building the quad motor mount tomorrow.

 

[Snoopy1]

I would run 4 Edge Lite 100s. It would be nearly 400amp draw at full throttles on 5s

400 ams at 5 cell voltage is a lot off power. Don’t think you will need a lot of runway. You could probably take off on a picnic table.
So can I surmise that you will be running four 5000 mAh - 5 cell batteries.

Still waiting for the aluminum to show up so that I can start making up the new gear need it badly went flying yesterday and had to bend the gear back into shape again. Also waiting for a set of Airtops wheels 6 1/4 inch

 

[RC80AK]

I hit the quad motor mount hard today and made some good progress! Everything is fabricated, tacked, and ready for final welding.

 

[WMcNabb]

Nice work!!

 

[Snoopy1]

Looking good nice clean work.

 

[pawnshopmike]

Amazing craftsmanship brother.