FlyingGiants - View Single Post - 88" Extreme-Flight Yak Electrified Build

Lokiyawl · 11-08-2009, 09:41 PM

Chad,

Wow, that was really helpful, thanks! That is a good idea I think to try and maximize the prop diameter to keep the thrust up, I will take your advice. Pulling power is more important than speed (pitch) to the kind of flying I am doing. The only disadvantage I have noticed is that very large diamters seem to make hovering more difficult due to an increase in torque. Maybe it is just me but I seem to run out of ailerons trying to hold the prop torque in a hover on my 74" with full bevel to bevel throws, have you noticed this? I should also mention that with my EVO that my MAH per minute dropped a good 15% when I went from a 21" x 13" to a 22" x 12" which gave me a full extra minute of flight time. I thought it was just a glitch at first but 10 more flights have all shown the same improvement. The thrust is also better with the 22" and the WOT static amp draw is higher of course.

Can you comment on how you feel that the 88" Yak would fly on 6000 + watts using either of the props you suggested? And do you feel that I am on the right track with using the Terminator or should I be looking at other motors for this plane? A few people seem to have good feedback using the Neu motor on this plane with 12S though the flight times seem to be really short (about 6 minutes) using 5000 MAH. Do you think that 7- 8 minutes would be possible with this plane without getting too heavy? I am getting 7-9 minutes ( batteries from 3850-5350 MAH) and leaving 30% in my batteries with my 74" and just wonder if there is a reason that this can't be done with the 88"? I have been reading these boards for a while and have come to respect your, so thanks again for the help with this project.

James

11-08-2009, 09:41 PM	#137
Lokiyawl Flyin' Around Join Date: Nov 2008 Posts: 29	Re: 88" Extreme-Flight Yak Electrified Build Chad, Wow, that was really helpful, thanks! That is a good idea I think to try and maximize the prop diameter to keep the thrust up, I will take your advice. Pulling power is more important than speed (pitch) to the kind of flying I am doing. The only disadvantage I have noticed is that very large diamters seem to make hovering more difficult due to an increase in torque. Maybe it is just me but I seem to run out of ailerons trying to hold the prop torque in a hover on my 74" with full bevel to bevel throws, have you noticed this? I should also mention that with my EVO that my MAH per minute dropped a good 15% when I went from a 21" x 13" to a 22" x 12" which gave me a full extra minute of flight time. I thought it was just a glitch at first but 10 more flights have all shown the same improvement. The thrust is also better with the 22" and the WOT static amp draw is higher of course. Can you comment on how you feel that the 88" Yak would fly on 6000 + watts using either of the props you suggested? And do you feel that I am on the right track with using the Terminator or should I be looking at other motors for this plane? A few people seem to have good feedback using the Neu motor on this plane with 12S though the flight times seem to be really short (about 6 minutes) using 5000 MAH. Do you think that 7- 8 minutes would be possible with this plane without getting too heavy? I am getting 7-9 minutes ( batteries from 3850-5350 MAH) and leaving 30% in my batteries with my 74" and just wonder if there is a reason that this can't be done with the 88"? I have been reading these boards for a while and have come to respect your, so thanks again for the help with this project. James