Beaver5150
Active member
In first news, the right aileron servo was replaced yesterday after locking it in place and flying single aileron the night before. On to today's news......
Now armed with 2 new 4S/2300mAh packs, I decided to remove the rear motor assembly. I ran a 3S/3600 first for a check flight, and as I expected, a little lighter on throttle punch but otherwise still flyable. The thing will still do a full vertical climb, but not as fast. Throttle point for level cruising was around 65%, one notch above 50%.
Running a single 4S/2200 put that throttle point right back to 50% as it was with 3 motors. There was no change in CG since the 3S/3600 weighs almost the same as a 4S/2300.
I ran a few more 3S flights during the night, then at midnight, I plugged both 4S/2300 packs in parallel and slipped them into the side pockets instead of inside the front nose canopy to keep CG where it belongs.
Plenty of punch at launch, climb rate still good, Mongrel flew near same as it did with 3 motors and 2- 3S/3600 packs.... noticably heavier, but still easy to fly. If anything, in this configuration Mongrel is flying more realistically like a large twin engine plane probably should, with stall speed a bit higher and a little more attention to throttle management needed at slow speeds, especially when hard turning into a tail-wind.
I'm good with all the above, though my curiosity has me thinking about having another go with those hot 2007/1700kv Emax motors, factory rated 2100g thrust on 4S. That's 4200g running twin motors, and I have only run them at 3S so far!
I'm almost ready to start a thread on Phoenix, resurrected from the remains of Stinger, soon to be Mongrel's little sister. I have the basic frame, power system and Rx configuration worked out so far.
Now armed with 2 new 4S/2300mAh packs, I decided to remove the rear motor assembly. I ran a 3S/3600 first for a check flight, and as I expected, a little lighter on throttle punch but otherwise still flyable. The thing will still do a full vertical climb, but not as fast. Throttle point for level cruising was around 65%, one notch above 50%.
Running a single 4S/2200 put that throttle point right back to 50% as it was with 3 motors. There was no change in CG since the 3S/3600 weighs almost the same as a 4S/2300.
I ran a few more 3S flights during the night, then at midnight, I plugged both 4S/2300 packs in parallel and slipped them into the side pockets instead of inside the front nose canopy to keep CG where it belongs.
Plenty of punch at launch, climb rate still good, Mongrel flew near same as it did with 3 motors and 2- 3S/3600 packs.... noticably heavier, but still easy to fly. If anything, in this configuration Mongrel is flying more realistically like a large twin engine plane probably should, with stall speed a bit higher and a little more attention to throttle management needed at slow speeds, especially when hard turning into a tail-wind.
I'm good with all the above, though my curiosity has me thinking about having another go with those hot 2007/1700kv Emax motors, factory rated 2100g thrust on 4S. That's 4200g running twin motors, and I have only run them at 3S so far!
I'm almost ready to start a thread on Phoenix, resurrected from the remains of Stinger, soon to be Mongrel's little sister. I have the basic frame, power system and Rx configuration worked out so far.
