flyboy91

My Feedback: (1)

Hey everyone out in pattern land, I just got done testing a new power system that may be of interest for people. It's a hacker C50-11XL
spin 99 speed control
8s thunder power 5000mah packs
21x14 falcon carbon prop

with this setup I pulled 80 amps at 2600 watts. I flew this in my spark and provided really good speed and power. The advantage to this setup is it's 8oz less than a 10s setup. I think this power system is great for up to 7:45 flights. I flew for 8 minutes and pulled 3980 out of the pack.

Andrew

toddblose

My Feedback: (10)

Wow Andrew, what kind of power difference is there between the 8s setup and the 10s. This could really change things.

RC_Pattern_Flyer

My Feedback: (1)

Interesting setup as i have seen this recommended by sebart for the wind s Pro on his website.

Chuck Hochhalter

flyboy91

My Feedback: (1)

Todd,

The power is very similar to my C50-14xl. The only difference is that the run time is shorter as we are pulling more amps. I think this is a very good option for those that are looking for the electric switch and can't make weight with there current setup.

Andrew

RC_Pattern_Flyer

My Feedback: (1)

So this setup might not be viable for masters as the sequence is quite long. I did notice you are running a larger prop than is recommend by Seb. Have you tried a 21 13?

thanks and look forward for more info.

Chuck

flyboy91

My Feedback: (1)

Chuck,

I havnt tried the smaller prop but that will gve you a little less power and more runtime which will be really good. I'd agree that it's probably not an option for masters this year as it's a long sequence with the last few maneuvers needing a lot of power. I'm thinking though that for the lower classes this would be perfect as the weight decrease is huge. I'll get a few difference props to try.

RC_Pattern_Flyer

My Feedback: (1)

Here is where I think a new approach to elecctric comes in. You could run an 8S setup, lighter airplane but you still have a draggy profile. this lends itself to a not widebody setup but still maintain a tall fuse for rolling. Less drag, less need to pull it, less power consumption.. So we should fly skinny blimps hahaha

But seriously, I think there is potential with the right airframe.

Chuck

Mavox

I cant see how weight can be saved with this one. Obviously 8s is lighter then 10s of the same cell size but if one looks at the total energy capacity…

a 10s 5000pack has a total energy capacity of 185 Wh
a 8s 5000pack has a total energy capacity of 148 Wh
a10s 4000pack has a total energy capacity of 148Wh

So with a 8s 5000 pack I have the exact same energy capacity as a 4000mAh 10s pack. If one neglects motor efficiency this means that a 14Xl on a 10s 4000mAh pack can fly as long as an 11xl on a 8s 5000mAh pack. Is then 8s 5000 any lighter then 10s 4000? I looked at a few different lipo brands and no this does not seem to be the case. For instance.

Topfuel 20c 10s 5000 - 1270g
Topfuel 20c 8s 5000 – 985g
Topfuel 20c 10s 4000 – 970g

As we know lowering voltage and increasing current is bad for efficiency, hence the 14xl and 10s 4000 should be more efficient, give better power, and still not any heavier then an 11xl setup. I might be missing something. How can I benefit of using an 11xl?

rcpattern

My Feedback: (45)

Chuck,

Even flying as big as I have been, I was able to finish a Masters flight in about 7:30 if I didn't do anything extra, no big procedure turn and such after take off.

Arch

RC_Pattern_Flyer

My Feedback: (1)

Arch,

I hear what you are saying, I guess it would depend on how demanding a flight Andrew put in. I think this is a great setup for lower classes for sure as it would keep investment down

Maybe ... maybe not..

Chuck

rcpattern

My Feedback: (45)

I'm pretty sure Andrew put it through its paces Sounds like it might be a great solution if you have to keep weight down. Very interested to keep an eye on it.


Arch

DaveL322

AJ,

What amps / watts are you seeing on the 14XL with same prop and TP 10s 5000s?

RPM on both setups?

Thanks,

J Lachowski

My Feedback: (46)

Can't believe this motor is priced $165 more than a 13 or 14XL. Too expensive of an experiment for my liking.

TonyF

My Feedback: (92)

Not really a good alternative as a Hacker 11XL is one of the most expensive motors you can buy. The other thing is that this set-up will run everything hotter. Higher current is higher temp. I guess it's interesting, but a smaller capacity 10S pack is still better.

Mike Wiz

My Feedback: (2)

If you've ever played with electric power simulation programs you might have once, just for fun, looked at what happens with an absurdly high voltage power system and a very low KV motor. You could fly all day on one charge and the system would stay cool. Obviously, we can't do that in practice but it does make a point. I'm sort of surprised you guys at the top levels haven't been playing with 12S power systems.... or maybe there is a rule against that?

can773

My Feedback: (1)

Yep, FAI restricts the voltage to 42V fully charged...

Mike Wiz

My Feedback: (2)

Of course.....

TonyF

My Feedback: (92)

And of course, the AMA pattern rules followed suit. 12S would be a lot better.

flyboy91

My Feedback: (1)

Yes I agree that a higher voltage system would work as well in this case. I wad just trying to state that I have tried this setup on both a bipe and mono plane and it worked pretty well. Granted not as effecient as other setup it's a setup that will work and allow people to use a lighter setup.

TonyF

My Feedback: (92)

Hi Andrew,

Do you have a set of 10S 4350 packs to weigh an compare? If so, can you check what the weight difference is between the 11XL and an 8S 5000 pack and a 14XL with a 10S 4350?

Thanks!

flyboy91

My Feedback: (1)

Tony,

Just weighed them, the Tp 10s 4350 weighs in at 37.4 oz. The 8s 5000 is 33.7 oz on the same scale. What I found on the 4350's is that it was a max 7:15 min pack. Any more than that and I was pulling out more than 80% of the pack.

TonyF

My Feedback: (92)

Well, that's significant. Would be interesting to see what capacity it would pull on a wide open Masters pattern. When I had to use the 4350's last year it took 3900 to fly a pattern. Really too much for that pack.

flyboy91

My Feedback: (1)

Tony,

When I go out next time with the pattern plane I'll fly it through the masters pattern and let you know what I find.

Andrew

flyboy91

My Feedback: (1)

Double post....

Brenner

I have a pair of 18C 4270 mah 5S packs that weigh about 34 ounces. These could be used to put a 10S system together that has about the same weight as Andrew's 8S system. It still wouldn't compete with Andrew's system on flight time, but it would be cheaper.