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Old Feb 24, 2013, 10:41 PM
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Correct - it's at 85%. There is some room left there. I didn't want it too quick, initially during the build, but that was before I started with the lower head speeds. SpinBlades also makes some asymmetrical tail blades (for use with their mains) but only for the larger 600-700 size helis believe. But you are right - there are some other things to be tried first.
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Old Feb 25, 2013, 05:48 AM
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Will a Revco 6mm Mod 1.0 pinion work with a Swift 550 maingear or is it too long?
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Old Feb 25, 2013, 10:14 PM
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The standard Century pinions are 15mm tall - the Revco one, as well as the "tall" ones from Century are 22mm tall.

If the heli has two drive gears then the 22mm one will probably "hit" the bottom gear, which would not be good. If the heli is an older Swift 16 then the extra length might be okay as that heli only has a single gear.
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Old Feb 26, 2013, 05:00 AM
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So basically you're screwed on 6mm motors with the 550 and NX.
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Old Feb 26, 2013, 06:09 AM
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Quote:
Originally Posted by Atomic Skull View Post
So basically you're screwed on 6mm motors with the 550 and NX.
http://www.rcgroups.com/forums/showp...postcount=6452

Check out this post. If you have a Scorpion you also have the option of swapping a 6mm shaft for a 5mm shaft.

Mike
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Old Feb 26, 2013, 09:45 AM
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I guess you could also cut/grind the extra length of the 22mm pinion down to 15mm.

Also, HobbyPartz has some Raiden motors (with 5mm shafts) that "appear" to be from the same OEM source as the former Century motors:

http://www.hobbypartz.com/rahemo.html

I would look at the T30A (800kV) ... I almost bought this one, but ended up finding a pre-owned Century 800kV and went with that instead for my Swift 16. I still might get this one and swap it with the 1110kV motor currently in my NX.
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Old Feb 26, 2013, 03:43 PM
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Quote:
Originally Posted by mligosh View Post
http://www.rcgroups.com/forums/showp...postcount=6452

Check out this post. If you have a Scorpion you also have the option of swapping a 6mm shaft for a 5mm shaft.

Mike
I wanted to use an inexpensive Suppo motor (these have performed well in my 450's and 500). Putting a $100+ motor into an inexpensive airframe sort of defeats the purpose.
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Old Feb 26, 2013, 06:49 PM
If I build it, it will fly
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I would say either:
Turn down the exposed end of the shaft (if you have machinist friends)
Or
Cut the tall pinion down (bench vise & a Dremel w/cutting disc)

If you can't find a 5mm shaft that is. some 550/600 motors have stepped shafts that are only 3mm internally & then thicker for the pinion, so it's doable.

~psguardian
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Old Feb 26, 2013, 07:15 PM
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Originally Posted by Atomic Skull View Post
So basically you're screwed on 6mm motors with the 550 and NX.
Nope. You can use the CNMG5__TL's and put a spacer between the motor and the motor mount plate to lift the motor higher:

http://www.centuryheli.com/searchres...=0&q=CNMG5&sa=

That said, there are still a lot of inexpensive 600 sized motors available with 5mm shafts. A friend is using a 600 and seems quite happy with it.

http://www.hobbypartz.com/t30a-800kv.html
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Old Feb 26, 2013, 07:30 PM
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Oooo I like that idea even better. Got a link for spacer, or is this where we all tap into our inner MacGyver?

~psguardian
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Old Feb 27, 2013, 03:40 AM
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Nope. You can use the CNMG5__TL's and put a spacer between the motor and the motor mount plate to lift the motor higher:

http://www.centuryheli.com/searchres...=0&q=CNMG5&sa=

That said, there are still a lot of inexpensive 600 sized motors available with 5mm shafts. A friend is using a 600 and seems quite happy with it.

http://www.hobbypartz.com/t30a-800kv.html
A Suppo H3730-6 (2.2kw 830kv) costs half that.

http://www.empirerc.com/suppo-h3730-...nn-p-6379.html

I've used the Turnigy relabeled H2218 and H3126 in my 450's and 500 and they have worked well. The centrifugal fan moves a lot of air and is quite loud though. Unfortunately HK doesn't have a relabeled version of the H3730 because it'd probably be in the $30-$35 range.
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Old Mar 03, 2013, 12:13 AM
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550mm Asymmetrical Blades

I tried out the SpinBlades today and noticed quite a difference in the heli's response. But, to be fair, I also replaced the two 3S series lipos with a single 6S 3300 40C pack - just in case the two smaller batts couldn't handle the extra current requirements of swinging 550mm blades. I think they'll do just fine - only pulled 932mAh/13A avg. during the 4min test flight.

The asymmetric blades are a lot bigger than the Edges - both lengthwise and chordwise. They weigh more too (140g ea. vs 96g ea for the Edges). So, with the larger battery and heavier blades the heli's weight increased from 5.4 Lbs to 5.75 Lbs. The 6S pack resulted in the same RPM "range" over the flight of about 90 RPMs, but the range was shifted up by 30RPMs (1380-1290 vs 1350-1260) - obviously less voltage sag in this 6S pack.

All in all the heli felt supercharged given the extra weight and it's still rather low head speed. Definitely more lift and speed today - and the blades do sound a bit different. Tomorrow I hope to repeat the flight with the two Nano-Tech 3S packs which will shed about a 1/4 Lb of weight and see how the numbers compare to a similar flight with Edge symmetrical 520 blades.

This flight required approximately 50 Watts of power per pound of heli (average, of course).

Another Heli Video (5 min 36 sec)


***
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Old Mar 03, 2013, 02:48 AM
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Looks like those asyms made a big difference. Even with the paired 3s you could probly wring 6-7min without harm.

~psguardian
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Old Mar 03, 2013, 12:45 PM
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Looks like those asyms made a big difference. Even with the paired 3s you could probly wring 6-7min without harm.

~psguardian
Definitely

Just finished a 4min backyard test hover at 1250-1200 RPM - Sweet! (I've got to get one of those EagleTree loggers). This is half of the RPM/Voltage sag as seen when running at 1350-1250 on the same 6S pack.

Going to go to the field and fly a 4 minute test forward flight on the remainder of the pack's charge

(6S 3300 40C, 550mm Asymmetricals, 62.5% throttle curve)

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Old Mar 03, 2013, 02:34 PM
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Does that ESC have an honest governor on it? Setting it for 1250 I'm sure would pull a few more ma vs letting the HS sag with voltage, but might be nice to see NO performance sag.

~psguardian
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