RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes
Brennar,
I know you have been waiting for this. I got the drive in the Visa and flew it today. First let me say a few things. I used my dads mount and cut the props down a half inch on each tip. 25 C 5000's and zeroed out all the mixes except throttle to elev. 2.0%. I set up a plus 80 standard throttle curve (20% higher then normal) and increased the expo on the split rudder from 50 to 70%. Oh yeah and reduced the travel in split mode from 75% to 50%.
These things were all done before the first flight. The moment I ran it up I new my dads mount was really doing its job. This thing is whisper quiet. Immediately the performance was exactley what we wanted right from the take off. Rolls are effortless, differential is a thing of the past, stall turns either way and so on and so forth. I was all prepared to go to 45 or 65C batts but its not needed.
Just to be sure I wasn't imagining things I pulled out my worlds visa and flew both planes back to back and they are very similiar. The only thing I forgot before the test flight was to split the rudder a little. I opened it about 3/4 inch and its as stable and smooth in yaw as any plane I have ever flown.
Leon and I spent the afternoon flying and smiling. Tony is coming tomorrow and even though I am in shootout mode we will fly the Visa a few more times.
It was 97 degrees out today and the Batts were cold. I only flew about 7 minutes a flight and was landing at 37.8.
What I cannot figure out is why the speed was so good. Maybe its just the trottle curve, but all doubts are gone now in my mind about this.
Anyway back to work on the Extra to get ready for tomorrow. I had completely forgotten about wiping planes off and after looking at the bottom this afternoon (Approaching 30 gallons LOL) I figure I better get a jump on this.
Anyway congrats once again on this and you really need to try one with my dads mount totally different sounding.
C
PS and Dick it was a plane Marcelo made for himself by himself lol. We all no how that goes. I will call you about the cation. BTW we are closing the paint shop until I get back Miry has been working 12 to 13 hours a day and she needs a break. On the plus side if guys can wait a few weeks it will really be worth it. You will be able to buy a ARC from Marcelo, for $2200.00 (Thats what he sells them for with all accessories)and then when he gets it ready I will check everything and Finish it out to ARF. This will save everyone about $750.00 and you will have the exact same plane. Basically $3000.00 instead of $3600.00. Dick yours is first. Pass the word