This is my first electric pattern project and the first time I have even seen this size motor run. I ran it up in my foyer in order to get some RPM and current numbers. All I can say is that I am very impressed with the power of that fan up front. Window curtains were blowing all over the place 20 feet away. Hopefully the weather will clear sometime this week so I can make the first flights.

Final weight? Well even with the weight savings listed above; with the APC 22 x 12 E prop mounted I am over by about 10 or 15 grams. With the 20 x 15 prop I am under the limit. Changing to the smaller prop also moves the CG by about 1/4 inch

I have a few ideas for additional weight savings for the final few grams. If I can find it or modify something existing, changing the spinner adaptor to aluminum would save a bit. Right now I have the double jam nut for a YS 120 I believe. The screw holding the spinner cone can also be changed to aluminum.
The 4, 6 X 32 countersunk screws holding the motor in place could be changed preferrably to titanium but aluminum may be strong enough. The 2 elevator control horns (MK) are held in place by 3mm x 30 steel socket head cap screws. If available, aluminum there would save another 4 or 5 grams. All of this will surely not effect flight characteristics at all but I like to play by the rules.

Although I have built some very light pattern planes in the past, it is much easier to do when you build form a kit of from scratch. Your possibilities to reduce weight in an ARF are available but limited. All in all a very interestng learning experience. Weight savings were measured in gms and just kept adding up.

To reiterate though the plane will make weight easily when using TP 5300 cells which are pretty much the standard.

First flight report soon!

I hope the thread will prove useful. I know I learned a lot from similar posted build threads.

Stuart