ORIGINAL: Turbotronic
Oli,
Dont have the article yet but I have seen methods like this before. A very interesting subject though. I wonder if anyone has ever verified these servo loads with a direct measurement, ie a force gage. I suspect that most of the digitals we use today are more than enough for our applications. All flying scale stabs maybe an exception, where the hinge line was designed for supersonic conditions maybe?
Even logging precisely the individual servo current throughout a flight together with roll rates, g etc may give a clue?
Andre
Hi Andre,
I have a servo test bench using my laboratory dynamo meter. All the servos I have tested are making the torque claimed by the manufacturers
initially.
When the servo warms up, the stall torque drops gradually.
I have not yet published the results because it is a lot of work coming ahead. However similar thing has been done before and is available on line here:
http://www.troybuiltmodels.com/categ...00/Servos.html ( check the "TBM test data" and "servo testing" tabs )
I explain in the article why it is worth checking the torque required for the proper application. In summary if you get the right servo size:
1. You'll optimize the price of the system ( I do not talk about low cost application here )
2. You'll optimize the current consumption of the servos (
http://www.rcuniverse.com/forum/m_92...tm.htm#9257664 )
3. You'll optimize the weight of the Rc system ( servo size, connectors, leads, power bus, batteries )
All flying stabilizers are very specific and I wrote a 10 pages article to come in the June/July RCJI publication about this matter ( it will probably become 4 pages after editing ).
I have also been logging the servos consumption in flight using my Eagle three system ( the torque to current relation is linear for most of the range of use with today's digital servos ).
This enabled me to validate the figures found with the method. They are relevant.