![]() |
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
|
#1
|
|||
|
|||
![]() Barnyard BOb -- wrote: Okay Jerry, I took your advice and spent $135 bucks today for an Odyssey 16 Amp-hr dry cell that weighs 15 pounds (the 680). I cut the aluminum for a bracket on the gyroscope to mount it but I gotta get Kevin to TIG weld it later today. Badwater "I got me a new stinking battery" Bill +++++++++++++++++++++++++++++++++++++++++ I ain't no genius, but my thoughts are that.... the Odyssey battery is all wrong for your application. Now go ahead and make a fool of me. g Barnyard BOb -- needing of a large charge If he is using a battery which one would work better Bob? |
#2
|
|||
|
|||
![]()
On Sun, 31 Aug 2003 00:41:14 GMT, Jerry Springer
wrote: Barnyard BOb -- wrote: Okay Jerry, I took your advice and spent $135 bucks today for an Odyssey 16 Amp-hr dry cell that weighs 15 pounds (the 680). I cut the aluminum for a bracket on the gyroscope to mount it but I gotta get Kevin to TIG weld it later today. Badwater "I got me a new stinking battery" Bill +++++++++++++++++++++++++++++++++++++++++ I ain't no genius, but my thoughts are that.... the Odyssey battery is all wrong for your application. Now go ahead and make a fool of me. g Barnyard BOb -- needing of a large charge If he is using a battery which one would work better Bob? +++++++++++++++++++++++++++++++++++ How about a_40 lb_Odyssey, Jerry? g The first concern is to successfully SIZE the battery to this unique demanding application. A 16 amp-hour Odyssey is going to empty out pretty quick unless one is willing to start the blades rotating by hand. If one has to do that, one may decide that the starter, battery, etc are not worth all the time, effort, weight, complexity and cost. OTOH...... just keep upsizing the battery until satisfactory performance is achieved or the gyro is too heavy to fly. g All this is going through my mind without a shred of practical experience. So.... take it for what it's worth. Barnyard BOb -- thinking out loud |
#3
|
|||
|
|||
![]()
Barnyard BOb -- wrote in message . ..
.... A 16 amp-hour Odyssey is going to empty out pretty quick unless one is willing to start the blades rotating by hand. .... I am using the PC680 Odyssey battery for starting a 10.5/1, 220HP Franklin engine. It has no trouble cranking the thing. True, at 225amps cranking the battery won't last more than a few minutes. But if the thing does not start in the first 5-10 seconds, there is something else wrong. ---------------------------------------------------- Paul Lee, SQ2000 canard project: www.abri.com/sq2000 |
#4
|
|||
|
|||
![]() |
#5
|
|||
|
|||
![]()
Badwater Bill wrote:
That's an interesting application. The 680 is only 15 pounds and it's small in volume, that's why I like it. I got a hold of a couple 35 Amp-hr Gel Cell batteries today from a buddy (brand new out of the box and he just gave them to me since his application disappeared). I'm going to make an APU out of them and use them to hook up in parallel during my starts. That way I'll have plenty for the flying day. My real problem here, and I haven't talked about it, is that my blades aren't tracked properly. I've painted one tip red and one black. You can't track them without flying the damn thing. In flight, you look at the tips and see what blade is above the other. Then you land and reduce AOA on the high blade, spool up again and go for another try. It's an empirical thing until you get it dialed in. The problem with a Walmart motorcycle battery is that I get about three starts from it with a 30 minute charging time between each start and the battery is toast since it deep cycles to full discharge. That battery is simply not designed for what I need to do. Ah, now things are clearer. Why not setup your electrical system so that you carry one gel cell battery (no Odessey at this point) in a quick-change manner? Leave the other gel cells (how many did you get from your friend?) on the ground on a fast charger. On each landing, swap the gel cell with the most charged one on the ground. When you've finally got the blade tracking problem solved, go back and install the Odessy 680 as your permanent lightweight battery. Russell Kent |
#6
|
|||
|
|||
![]() Ah, now things are clearer. Why not setup your electrical system so that you carry one gel cell battery (no Odessey at this point) in a quick-change manner? Leave the other gel cells (how many did you get from your friend?) on the ground on a fast charger. On each landing, swap the gel cell with the most charged one on the ground. When you've finally got the blade tracking problem solved, go back and install the Odessy 680 as your permanent lightweight battery. Russell Kent I don't need to switch out a gel cell each time. I can do exactly what you indicate here by simply hooking up to the APU each time and leaving it on the fast charger. Then I don't have to carry the weight along with my big gut each time. BWB |
Thread Tools | |
Display Modes | |
|
|