The nose weight required for the OS 52 was 10oz - 4 oz in foam behind the firewall and 6 oz mounted in a box on the motor mount under the cowl. 4.8 Volt 4 Cell NiCad pack immediately behind the firewall... all of which increased the overall plane weight considerably.

The good news was it did not seem to affect the performance at all as can be seen in the video and I would still recommend a motor in the smaller range if that is what is available.

On the other side... the OS 70 with a 6 Vold 6 Cell NiMh pack immediately behind the firewall did not require ANY additional nose weight to balance. My main issue with the 70 is that the plane Yaws considerably at the entry into vertical manuvers and needs to be offset with shims under the motor mount... a small gripe to be sure and it hauls the mail even at 1/2 throttle.

Both planes weighed in between 7 to 8 pounds - heavier than is stated on the Kyosho web site so the wing loading was higher as a result. The main thing to watch for is the landing approach... not terribly fast at .25 throttle but it will drop altitude rapidly at the lower power setting... it still flaired nicely and I even did some 3 point landings with no problem... it is just a plane that you fly to the parking area... I did not mind the faster approach speeds and if taken into account during the landing phase should pose no problems.

Overall, I was impressed with both setups... if you want to offset the weight addition with power than a 70 is the way to go... even with the smaller engines it flies great.