Well said.
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Official Freewing MiG-29 Fulcrum Twin 80mm Thread
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Originally posted by Gordon View PostI know I will get laughed out of town for asking this, but could you fit three batteries, say 4000s into the Mig and would it give extra flight duration ?
Anyway, as far as fitting - look at the arrangement of 6000s in the battery bay in the video - the front is empty. And in the 4000 flight video, you can see the middle slot it empty. So I don't think there is a question that it fits, there are three positions for batteries. The question is if you can balance it (without adding further tail weight). It seems like the two rearward 4000's would have to be as far aft as possible to compensate the front 4000, because if you compare to the 2x4000 situation, adding a third battery in the middle slot would move the CG forward. And then there's the weight of the extra wiring.
IMHO the 2x6000 case already looked a little heavy. Going well over that weight for the same capacity seems questionable to me. But it's not completely crazy, especially if you happen to have 3x4000 laying around and don't want to buy 2x6000.
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Originally posted by dsmithwc04@yahoo.com View PostI thought it was interesting that the 5100 batts had same flight time 5:30+ and active throttle ~4:00 as the 6000 batts. Must have reached the depreciating returns on weight to power. Since I plan on running 5000s this isn’t bad new at all.
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I don't use Admiral batteries. I am fairly easy on my batteries in flight and usually opt to use lower C light weight batteries. For 80mm's and this I will be trying 620-640g 5200mHa Hobby Stars, 765g 5800mAh Roaring tops and 760g 6200mAh ESpeed's.
Still considering moving to JetFan/ HET 8S too.
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Originally posted by dsmithwc04@yahoo.com View PostI thought it was interesting that the 5100 batts had same flight time 5:30+ and active throttle ~4:00 as the 6000 batts. Must have reached the depreciating returns on weight to power. Since I plan on running 5000s this isn’t bad new at all.
There are usually diminishing returns in both ends of the scale for all models.... At some point, adding more battery more or less stops giving more flight time since they model flies more heavy and less efficient - which can be a good thing by all means, but not for stamina. In the other end of the scale, you can typically maintain similar flight times as you decrease battery since - to a point where a lighter, more efficient model stops making up for the fact that you bring less fuel.Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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Originally posted by James View Post
Interestingly enough, there is a great amount of space on the sides of the back battery compartment. We have our receiver tucked in there with plenty of room and the eagle gyro is under the back battery compartment. So you could totally fit the blue box back there and your RX / gyro and have the entire top/middle compartment clear if you wished. Might just need a few extensions for the nose gear and steering.Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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Originally posted by xviper View PostEven since HobbyKing brought out their "Graphene" (which is "Carbon" tech by another name) batteries, it's been very clear to me from using them that a Graphene type LiPo is bigger and heavier than a non-graphene battery. Experience in my planes tells me that performance and especially flight times for a Graphene battery is about 10% to 15% (or more) than a non-Graphene of the same stated mah. Eg, I've found that a Graphene 2200mah flies like a 2500 to 2600, a Gr. 3000mah flies like a 3500 and so on. That's why I've always advised that if you decide to go with Graphenes and weight and dimension are important, size them down a bit when you buy. Go take a look at the newer HobbyKing Panthers. They're even bigger and heavier than the regular Graphene type batteries and their flight performance in planes show they pack more in them.Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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Originally posted by James View Post
dsmithwc04 - Don't read too much into it. The 5100 carbons and 6000's weigh about the same. It comes down to the fact that you saw just 1 flight on 3 different sets of packs. No two flights are the same so impossible to extrapolate an average flight time based on just these flights. In total, the aircraft now has 17 flights on it. 3 prior to the announcement where we were very conservative, just wanted to get some flying footage and pics for the big announcement. 10 on the day with Patrick where he flew 4 flights on 4000, 2 on 6000, 2 on 5100, 2 on 5000. Then I just did my first 4 flights yesterday on the same aircraft, 2 with 5100 and 2 with 4000. I wish the only part of my job was to just be at the field all day every day, but it's not. But, either way, what you should take away from these videos is that for a large twin EDF jet, the flight time has come a long way and the days of 2-3 minute EDF flights are over.
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Are we talking flight time or useful throttle time? 3 min useful throttle time is about what I see across all of my FW jets to land at ~high 3.7's or about 25% remaining.
Granted, for my 80mms I'm using 4000's and 5000's for my 90mm to keep the weight down. Better batteries have a ~30 second longer time under load than the ones I'm using today I've seen and I'll be testing that out here shortly once my new pairs arrive. Carrying an extra 1000 mah will probably buy you another 30 seconds, so 4 min. is possible.
I'm okay with 3 min btw. I'd prefer better performance over longer flights.
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