Hi Joseph,

Hope those T33 parts are earning their keep !

A few points: I have loads of 8411s, (some with 100s of flights on them) 8511s and 8711s spread across my fleet of 10 jets and all are operated at voltages in excess of 4.8.

I have just bought a number of 8711s from Dave Wilshere (he has an excellent deal on them ) and saw a note on them that they were limited to 4.8v. Dave tells me that this note was added by Macgregor, the UK importer of JR and should not be taken too literally!

On the Horizon web site they give torque ratings, derived from their own tests, for both the 8411 and 8711 servos at 6v so I have no idea why MacG impose their restriction, particularly as Horizon give JR products 3 year warranty, Mac G only 1. Very odd !

I use Weatronics, 6 v; Powerboxes, 5.9 (when measured at the servo after the diodes) Duralite regs, 5.1 and 5.6 and the excellent MiniHobby (which I believe is dual channel) at 5.5 V I almost always use dual batteries and dual regulators and never a failure. I have not yet tried the Spektrum regulator, my 9100 and 9000 receivers are fed by regulated Duralites and have given faultless service with still not a single frame loss.

( I cannot imagine why anyone would NOT use two batteries in an expensive jet, (where there is space) it virtually eliminates the chance of a total electrical failure and if it was not sound policy why do Weatromics and Powerboxes use duals ? It also means that one can replace batteries "on condition" rather than regularly as a precaution, particularly if using a Weatronics DR or Powerbox Royal both of which monitor and record battery performance. )

I always set up my flight controls so that the servos draw minimum idle currect and use the Hangar 9 device which is invaluable for that, quite indespensible when setting up a dual servo config, such as the Hawk stabs.

I have just finished the installation on my Eurosport and have been playing a lot with the PowerBox Royal, like the Weatronics this is a superb device and gives whole raft of valuable information on battery and receiver performance, I cannot speak too highly of these units AND they both have superb manuals, available on the internet, something which seems to have defeated the JetCat factory despite THEIR engineering excellence ! (yes I will keep plugging that anomaly until something is done about it !)

I have Wren and PST ECUs but have not yet used A123s on them because the voltage is different to that recommended. I will seek the advice of Wren and PST.

Wow, coffee is now cold but hope this helps ! Happy flying !

Regards,

David.