costath

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What is the MUS?

Doc Austin

Mini Ultra Stick. teriffic plane. I've got three ready to fly and two lits in the closet. I've also got an Ultra stick 25E that I've been flying this week, and I'm building a nitor ultra stick with an OS46AX engine.

If you have a few minutes to read, check this out:

http://www.rcgroups.com/forums/showthread.php?t=589166

costath

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Matt
Thanks for the response.

tom

bzizzi

Last two days here in Pa.we had 60+ mph winds can't fly unless I want to Kamikaze my plane.I installed longer servo arms on
the MP alerons so I could back the servo % back down from 140%.I want to buy another motor for my MUS what would be a
good choice other than the stock 450.I am looking at Hacker A30-28S,tried the Himax 2816 890 and really liked it but liked
the sound of the e flite better.What about a 480 1080 ???

Fliprob17

I would go with the Park 480 BL 1020kv from E-Flite. There are a lot of guys who have put that motor in the MUS and say it hauls.

rwsduc

Started out flying a Super Cub and Typhoon in late August. Bought my first balsa plane last week (MUS PNP) after resisting the urge to buy a MPXT (solely based on its good looks). I flew the Stick yesterday and really liked it, but it's quite a step up from the Typhoon, and I figured it's just a matter of time before I crash it beyond repair.

My rationale for buying a MP this afternoon was to have a recipient airframe standing by for the day the MUS becomes an electric organ donor. Now I'm thinking of cannibalizing the MUS right now and putting a 480 on it down the road so I can fly the Pulse this weekend. I got into this hobby because I figured it would be cheaper than firearms and motorcycles. So far it hasn't worked out that way since no one bothered to tell me how addictive this stuff can be.

Fliprob17

Ya, no kidding huh

I have not even flown the Pulse yet and I have already been considering the E-Flite P47 warbird, especially after seeing one in action this weekend.....the madness will never end.

Got the new 1" tailwheel for the Pulse today, big improvement from the little skinny braces rubberband it comes with. I have been taxiing it around and it does much better in the grass with the larger tailwheel.

bzizzi

Stop playing around on the ground with the MP and smash the throttle and pull back on the right stick !!!!
It is a blast to fly,I finally got my replacment 450 outrunner motor for my MUS and installed it.
Weather forcast looks super for tuesday all day and will try to fly both planes.I am going to order a 480
1020kv motor for MUS #2 and turn it into a missle.I just got my new Cellpro 4S balancing charger
and it works awesome,fuel gauge feature is really cool.It balances all cells while charging.Well worth
the money,I also purchased an adapter to charge PolyQuest and TP packs.I ordered a TP Pro Lite 2100
11.1V pack.Make sure you have the dual rates turned on the MP alerons back at least 50% on your first flight,
it is a little twitchy at first til you get used to it.I am using a E flite 10X7 prop and the MP really moves out.

Fliprob17

Ya, I know It is kinda an early Christmas present......so I am trying to be good.....but it is not working so well so far [>:]

I have the AstroFlight 109 and I use the Blinky balancer while charging, looks like a little cheapy balancer, but it does a great job. And so far I love the charger.

The MUS should be a rocket with the 480 motor, it weighs a little less than the Pulse so it should have no limits with that motor. That is the motor I put on the pulse, and even though I have not flown it yet [:-] I really like the motor, really cranks......on the ground......[:-]
I have an APC 11x7E on it right now, and it is only pulling 23 amps at full throttle, so I just got an APC 11x8E and will run some tests on that.

I have the Thunder Power 2100mah pack, seems like a great pack so far. Thanks for the advice on the dual rates. I had them set at 75% already to be safe, I may come down a little further now.

Doc Austin

An observation abouty the ailerons: I used to fly AMA pattern, and one of the maneuvers was three consecutive rolls. To get it perfect, you did those three rolls in five seconds, so I set all my planes up to do that with full aileron deflection. It turns out that just happens to be an extremely comfortable setting for the ailerons in general. The Pulse rolls just a little slower than that with the settings called for in the manual, so if you use that, the plane will be just about right.........for me anyway.

I've found not enough aileron can be almost as bad as too much. If you don't have enough, you are always chasing the plane and maybe don't have enough throw to get out of trouble. I went with the standard settings and the plasne was just about perfect.

Doc Austin

Oh, it certainly is..............


Thunder Power has just come out with a 2050 pack that has a 50 amp discharge rate. The 2100 has a 30 amp rating, so if I understand this right, with the 2050 you can run more prop and not overheat the battery. It's a tad less battery, but I suspect it will run a lot cooler than the 2100, so I will probably pick a couple up. This summer my 2100 packs were running too hot, so the 2050 might be the ticket for me.

I've only worked with an amp meter just a litle, but I'm pulling 30.5 amps with a 12/6 APC. Compared to what you're getting that seems like a lot. It seems like the 12/6 doesn't give you that much more in the air than the 11/7, so I suspect theymight pull about the same. I wonder if I'm doing it wrong, or if my meter might not be working right?

Doc Austin

Oh, stop laughing. I'm sure all of you have double posted before!

Doc Austin

Uhhhhhhh, ok. Double posting is forgivable, but I've got to admit to being a bonehead for triple posting.

Fliprob17

That is a good find, I did not know they had that battery. The 2100-3S Pro-Lite is rated to have a continuous around 30amps (31.5) and a burst around 40 amps (42). I am only pulling 23 amps at full throttle and around 10amps at half throttle, so I am hoping I will be good. So far in doing tests it has not even gotten warm at all, but I have only used about half the charge at any given time. I will see what happens, then possibly look at that new one.

Definitely, I have adjusted for too much and not enough on my Cessna, and it can be like flying a dead weight bus or a mini coop that turns way too fast.

Which 480 do you have? I have the 1020kv. But, ya, I am running the 11x7E APC prop and at full throttle for about 10 seconds it does not go above 23 amps. I am using the E-Flite Power Meter, same deal I am sure, battery plugs into one end and ESC into the other. If that is the case with the 12x6, it does not seem worth it. I will have to try one and see if I get what you are getting, I have two sitting in a box.

costath

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I like what I'm reading about the eflight outrunners.

Can anyone direct me to a site that has data with different props?

Many Thanks

tom

Fliprob17

I don't know that I have seen a site with the prop comparison data. Just what people have talked about here. Earlier in this thread I did a big comparison on the 480 vs. the 450 outrunners, but no prop comparison was involved.

bzizzi

I use a Himax 2816 890 with a E-Flite 10X7 prop on the MP and it has more than enough power,it takes off in about four feet !!
The MUS has the 450 outrunner with a APC 10X5E and it is more than adequate,if I use the 10X7 prop it is alot
faster but I loose 5 min flight time.I am using PQ 1800 Lipo packs.I am going to purchase an amp meter to see what is going on.

Fliprob17

I am going to try and run some tests with a variety of props on the E-Flite 480 1020kv, so I will post those as soon as I have time to play with some props. Probably an APC 11x7E, 12x6E, 10x8E, and an 11x8E. I have some APC slowfly's from 11x6-12x7 but I don't know that a slowfly is a good option for this plane. I also have some APC 10x8 and 11x7 sports I might try.

bzizzi

If you could compile a data sheet on different props matched with the 450 and 480 outrunners that would be awesome.
I had another great afternoon of flying today,flew all three packs out,two with the MUS and one with the MP,as much
as these two are different I love how the pulse fly's takes off and lands so smoothly.I can hover with the MUS,this plane
just gets better all of the time.I also have a sickness of keep buying models and building and flying them.I told my wife
I don't gamble drink or do drugs so this is really harmless fun.I thouhht I was a little ECD for having three MUS but Doc
has me beat.I would love to get togeather with some of you guys to fly and BS.

Fliprob17

Ok, had time to run some tests today and here is what I got:

Park 480 BL 1020kv Outrunner
APC 11x7E -- Half Throttle=7.3 amps Full Throttle=24.3 amps 11.1 volts x 24.3 amps = 270 watts of power at full throttle = 160 watts per pound -- 3D and High speed aerobatics

APC 11x8E -- Half Throttle=7.7 amps Full Throttle=25.0 amps 11.1 volts x 25.0 amps = 278 watts of power at full throttle = 164 watts per pound -- 3D and High speed aerobatics

APC 12x6E -- Half Throttle=7.4 amps Full Throttle=25.0 amps SAME

The battery voltage used to calculate watts was 11.1, so less than full charge, so at full charge the results will be much higher in terms of watts and watts per pound.

So the bang for the battery seems to be the 11x7E, little longer flight times and basically the same total power created. However, if you want a little more ummph, it appears to be a wiser decision based on the test numbers to move up from the 11x7 to a 12x6 vs. the 11x8. Same amps at full throttle but at the lower throttle settings, the 12x6 will draw less from the battery and give you longer flight times. Of course I can not base this on actual flying experience and performance yet

Now, I don't have a plane with the Park 450 BL 890kv, so I am hypothisizing a bit here. But based on the specified continuous amp draws of the two motors I can form a guess off of the 480 results for the 450:

APC 11x7E -- Half Throttle=4.7 amps Full Throttle=15.5 amps 11.1 volts x 15.5 amps = 172 watts of power at full throttle = 102 watts per pound -- High speed and aerobatics

APC 11x8E -- Half Throttle=4.9 amps Full Throttle=16.0 amps 11.1 volts x 16.0 amps = 178 watts of power at full throttle = 105 watts per pound -- High speed and aerobatics

APC 12x6E -- Half Throttle=4.7 amps Full Throttle=16.0 amps 11.1 volts x 16.0 amps = SAME

How accurate the 450 numbers are I am not sure, it is math not exact testing, but it is an idea I guess.

bzizzi

How would the 480 920kv compare ???

costath

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Another Mini Pulse XT ready for maiden.

Powered by a homemade 3.5 stator BL, 3 strand, 26 gauge, 6 magnets (15x5x2), Wye wind.

Has a Kv oif 3,230. Just slightly better than my goal. Was shooting for a Mega 16/15/3 type performance.

I'm sure she'll fly as sweet as she looks.

Great design....

Fliprob17

The Park 480 BL 910kv has a 20 amp continuous rating and a 25 amp burst vs. the 22amp continuous rating and the 28 amp burst of the 1020kv, so agian working numbers and not actual testing:

APC 11x7E -- Half Throttle=6.6 amps Full Throttle=22.0 amps 11.1 volts x 22.0 amps = 244 watts of power at full throttle = 144 watts per pound -- Light 3D and High speed aerobatics

APC 11x8E -- Half Throttle=6.9 amps Full Throttle=22.5 amps 11.1 volts x 22.5 amps = 250 watts of power at full throttle = 148 watts per pound -- Light 3D and High speed aerobatics

APC 12x6E -- Half Throttle=6.7 amps Full Throttle=22.5 amps = SAME

Little less performance than the 1020kv version, probably just about right for the Pulse. Since it is not a complete 3D plane anyway, hovering right around the 150 watts per pound mark should be good for the Pulse. Little longer flight times than the 1020kv version as well. But for only the minute or two of extra flight time, it may be worth having the 1020kv version so you have that ridiculous power and speed at times

Fliprob17

Right on....nice additions it looks sweet

costath

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Thanks for the kind words.

I appreciate your data as I've been drooling over the 450 & 480 myself.

just curious tho, are you measuring the current and calculating the power?

Most batteries will have a vltg drop at those discharge levels.

Also, you are showing an increase in current with an increase in pitch, I would expect the opposite?

Keep up the good work, it really helps.

Tom