Let me add something to the subject. Higher supply voltage: The bridge transistors that pass on battery current to our servo motor will turn on much harder at higher supply voltage that pass on those would be loosed energy in heating them back to the benefit of the motor. We have an electrical efficiency appreciation. Switching power transistor at a sizeable load are selected by sustainable power dissipation Pd at ambient T, allowable saturation voltage (lower the better) and current gain. In a price world survival the fittest, cost will drive the gain, size and Pd down to a point where nothing is operating optimal when design is done, un/intentionally. High saturation voltage translate to loss of motor input voltage. To make things worse, a lower than normal supply voltage will starve the drive current into these transistors making their saturation voltage goes higher than marginal that results in even lower input voltage at the poor motor. Due to the effect of drive current and ON resistance is much higher as a result of lowering the supply voltage, light duty plane that only need low fractional of available servo power will benefit from electrical duration. The duration gain is out of starving the servo motor voltage down to a marginal point. However, there is a limit down that path. Since, each motor has its permanent field that each motor must first over come before honoring their duty. Such magnetic field plus servo load in flight can stall our servo motor as those low voltages. So between endurance and stall rpm, there is a "sweet" sport one can go about. That may opens up an area of interest in finding such sweet sport. Going from 4C to 3 or 2C is not for big bird and yet weight saving from battery is not what we care first either. What is left is our HLG where weight is paramount can we find enough incentives to risk before a near stall servo in operation. When a servo stall, any more/less mAh remains in battery will not matter any more. I hope we do not mixed between going from 4C to 5C and from 4C to 3 or 2C of the same hardware. Going down will risk motor stall but gain in duration by starving the "worker" servo. Going up in C can mean higher available watt-hour or Wh and up in efficiency will the duration increase as well. I am glad that Tord was not close to me before I finished that final paragraph. :-) or I may not live long enough to finish my writing. YK Chan Seattle ----- Original Message ----- From: Karlton Spindle <[EMAIL PROTECTED]> To: Werner, Jason <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Tuesday, June 20, 2000 9:51 AM Subject: Re: [RCSE] Where to get a 1100 mah pack > LOL! That Emory! He went up and down telling me I HAD to use the voltage > regulator!! Arrrrrggggg it will not hurt and they work great with the MPX > voltage monitor switch :) > > Smooth Sailing, > Karlton Spindle > Http://www.MultiplexRC.com > ----- Original Message ----- > From: Werner, Jason <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Monday, June 19, 2000 1:47 PM > Subject: RE: [RCSE] Where to get a 1100 mah pack > > > > Karlton, > > You know I hate disagreeing with you! But you do NOT need a voltage > > regulator for the duralite packs. Yes they are 6v packs (2 cells) and run > > almost 6.9 v when fully charged. But this is fine for almost every every > RC > > part we have. The only problem one was an old Futaba 7 channel PCM rx > that > > would only use a max of 6 V. All other RC equipment is rated up to 7+ > > volts. I use 2 480mah cells in my HLGs for even better performance at the > > same weight as a 4 cell 110mah nicad pack! > > yes you have to use the charger supplied. And you also CANNOT run > > the batteries down past a certain voltage. If you do then you have a > burnt > > out pack that is not even good as a paperweight because the don't weight > > enough! The charger is a 12V charger and works great. Plug in and when > the > > light goes off it is fully charged. no messing up the pack and no > > overcharging situations! > > I have used Duralites for 4 years now. Emory, the importer into the > > USA, gets in the 800mah cells and should have another shipment soon (like > > 25,000+ cells!). The only disadvantage in reality is the 2A per cell max > > discharge rate. Exceed it and they are toast. But to get higher current > > rates you double up. So a 1600 mah pack has a 4A rate (2 pairs), a 2400 > mah > > pack is 6 A (3 pairs), etc... A 1600mah pack is about the same size as a > > 500mah 4.8 v nicad and a litle lighter. > > > > Jason Werner > > > > > > -----Original Message----- > > From: Karlton Spindle [mailto:[EMAIL PROTECTED]] > > Sent: Monday, June 19, 2000 10:21 AM > > To: Orbitone; soaring exchange > > Subject: Re: [RCSE] Where to get a 1100 mah pack > > > > > > Have you guys tried DUTALIGHT packs I am amazed at how light they are > > disadvantage is you HAVE to have a voltage regulator and a special charger > > but the weight savings is truly awesome! > > http://www.performanceprod.com/ > > > > I just picked up some 1600mil packs they are less then 1?2 the weight of > my > > pack I replaced!!! > > > > Smooth Sailing, > > Karlton Spindle > > Http://www.MultiplexRC.com > > ----- Original Message ----- > > From: Orbitone <[EMAIL PROTECTED]> > > To: soaring exchange <[EMAIL PROTECTED]> > > Sent: Monday, June 19, 2000 9:20 AM > > Subject: [RCSE] Where to get a 1100 mah pack > > > > > > > > > > Where would be the best place to get a 1100 mah square battery pack for > a > > > new plane setup .. I herd that Cermark in orange county might have such > a > > > pack.. and what do they run thanks .. > > > Mike M. > > > > > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" > > and "unsubscribe" requests to [EMAIL PROTECTED] > > > > > > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" > and > > "unsubscribe" requests to [EMAIL PROTECTED] > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" > and "unsubscribe" requests to [EMAIL PROTECTED] > > > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
