RCU Forums - View Single Post - Hitec 7954 Servo Failures
View Single Post
Old 05-06-2014, 06:35 AM
  #50  
RCISFUN
My Feedback: (44)
 
RCISFUN's Avatar
 
Join Date: Apr 2002
Location: Erie, PA
Posts: 6,860
Received 26 Likes on 23 Posts
Default

Originally Posted by lightningmcnulty
There is no way that environment needs anything other than you have in terms of power supply and distribution, I have flown plenty of jets similarly set up with no issues and on my uf and viper I wasn't really concerned about my speed when I deployed the flaps. Just fit 8911's on the flaps and be done with it. At least until you solve the mystery.

as a side note I was interested in power requirements before and on my uf I taped all the surfaces in place, fitted a watt meter to the battery and worked everything at the same time. The flash had 4 8711's and 4 8611's in it powered directly through a 12121 with life's and I couldn't get the total amperage to go past 0.8, flight loads are probably higher but how much!?
There is a very good thread on flight loads, I used the calculator that was presented in the thread for a project that I am working on and found some interesting results. You can see my results in post #90 in the following thread where I made a chart with full flap deployment (60 deg) at various speeds just to see what type of loads are expected. So yes the brute force method will work... i.e. using a 470 oz-in DS8911 servo, however it could be considered a bit of overkill

http://www.rcuniverse.com/forum/rc-j...-sizing-4.html