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

Lokiyawl · 11-06-2009, 06:33 PM

Richard,

I responded to your very helpful email but I don't see it on the board so I am posting again. Thanks for you input
on the Hacker and the 99 AMP ESC setup. I am running the same ESC in my 74" and with the Plettenberg EVO and I have a bit over a 2:1 power to weight ratio and maybe 1.8:1 with the Eflite Power 160 which is heavier but has been 100% reliable. I would be nervous having so little reserve power while hovering down low and having an ESC shut down. I have done hovers exceeding 3 minutes with these setups with no shutdowns and only a very mild temp rise on the ESC, motor and batteries, 400+ flights and not one problem..electric can be wonderful!

Having an ESC shutodwn from time to time would pretty well eliminate the advantages of going to electric to start with for me. I try to size my ESC's so that they are a good bit larger than the max expected amp draw. It costs more in weight and $$ but I think that it is worth it for a plane that is important to you. I would like to try and come up with a setup for the 88" Yak that would meet the following criteria:
1. Have at least a 2:1 thrust to weight ratio
2. Be able to utilize my existing 3850-5350 5S batteries.
3. Have flight times of at least 7-8 minutes which is what I am getting with my 74" Yak.
4. Not be excessively heavy. ( I think that to get 8 minutes that I will be a good pound heavier than a light DA setup on the 88" Yak)

The Plettenberg on 14S seems like it might meet these requirements and exceed the thrust to weight ratio by a good margin. The cost of that motor is a concern of course and I wonder how the effeciency will be at the higher RPMS. Has anyone else run the Pletty on 14S and have any feedback on flight times? I think that the EF 88" Yak is an epic plane and would love to have a really nice electric setup in one. If anyone has any thoughts or ideas let me know. EF is currently out of the Yellow and Black color scheme so I have time to research this...
Thanks, James

11-06-2009, 06:33 PM	#134
Lokiyawl Flyin' Around Join Date: Nov 2008 Posts: 29	Re: 88" Extreme-Flight Yak Electrified Build Richard, I responded to your very helpful email but I don't see it on the board so I am posting again. Thanks for you input on the Hacker and the 99 AMP ESC setup. I am running the same ESC in my 74" and with the Plettenberg EVO and I have a bit over a 2:1 power to weight ratio and maybe 1.8:1 with the Eflite Power 160 which is heavier but has been 100% reliable. I would be nervous having so little reserve power while hovering down low and having an ESC shut down. I have done hovers exceeding 3 minutes with these setups with no shutdowns and only a very mild temp rise on the ESC, motor and batteries, 400+ flights and not one problem..electric can be wonderful! Having an ESC shutodwn from time to time would pretty well eliminate the advantages of going to electric to start with for me. I try to size my ESC's so that they are a good bit larger than the max expected amp draw. It costs more in weight and $$ but I think that it is worth it for a plane that is important to you. I would like to try and come up with a setup for the 88" Yak that would meet the following criteria: 1. Have at least a 2:1 thrust to weight ratio 2. Be able to utilize my existing 3850-5350 5S batteries. 3. Have flight times of at least 7-8 minutes which is what I am getting with my 74" Yak. 4. Not be excessively heavy. ( I think that to get 8 minutes that I will be a good pound heavier than a light DA setup on the 88" Yak) The Plettenberg on 14S seems like it might meet these requirements and exceed the thrust to weight ratio by a good margin. The cost of that motor is a concern of course and I wonder how the effeciency will be at the higher RPMS. Has anyone else run the Pletty on 14S and have any feedback on flight times? I think that the EF 88" Yak is an epic plane and would love to have a really nice electric setup in one. If anyone has any thoughts or ideas let me know. EF is currently out of the Yellow and Black color scheme so I have time to research this... Thanks, James