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Oct 06, 2015, 09:37 PM
3 Blades is Better Than 2!
kman24's Avatar
Thread OP
AT6

I think the listed voltage specs on that motor are just the more common or recommended voltages. Obviously, it would run on 4s as well, right? Besides, the watts are more important to be mindful of when sizing the motor. Plus, with that motor on 8s, you will need a fairly small diameter/low pitch prop. What size prop have you run on that setup?

Kman
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Oct 06, 2015, 11:00 PM
AT6
AT6
Love scale PC21s
AT6's Avatar
Kman

I am running a 13x6.5 it works for me I am not up with the tech and watts side of of things I just go by the recommended Nitro motor size and then get an equivalent electric motor the plane I am flying is a Piper Comanche
Oct 07, 2015, 12:34 AM
3 Blades is Better Than 2!
kman24's Avatar
Thread OP
I usually run different power setups through ecalc.ch and fine tune it till I get the results that I like. It takes a lot of guess work out of the process.

Kman
Oct 07, 2015, 02:18 AM
That will simply buff out
Boofhead's Avatar
What about this on 6S

https://www.hobbyking.com/hobbyking/s...dProduct=31153

About 2000W and perhaps a MAS 14 x 9 3 blade prop?
Oct 07, 2015, 02:24 AM
AT6
AT6
Love scale PC21s
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Kman
Thanks for that I have just signed up for the program It will turn me in to a pro over night
Oct 07, 2015, 02:33 AM
AT6
AT6
Love scale PC21s
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Quote:
Originally Posted by Boofhead
What about this on 6S

https://www.hobbyking.com/hobbyking/s...dProduct=31153

About 2000W and perhaps a MAS 14 x 9 3 blade prop?
Hi Boomfield
you might be on to something with this motor a 14x8 - 22.2V / 1906W / 88.2A / 5.36kg thrust

what do you think Knan
Oct 07, 2015, 12:22 PM
3 Blades is Better Than 2!
kman24's Avatar
Thread OP
Quote:
Originally Posted by AT6
Hi Boomfield
you might be on to something with this motor a 14x8 - 22.2V / 1906W / 88.2A / 5.36kg thrust

what do you think Knan
I don't have any personal experience with the NTM motors. It's specs are not very clear either on the HK website. I have a hard time believing that it can handle 2000 watts, at least not continuous. And then when you read reviews on it, people have commented that magnets have come loose. Many times they come loose because they are running too hot I would guess that it is good up to around 1500 watts continuous with a burst (10-15s) up to 2000 watts.

I tried to look it up in ecalc, but they only have the smaller NTM motors. Ecalc has the Turnigy SK Series and the SK5055-5 (580) motor is very similar to this NTM motor in specs. If you plug it into the calculator with a 6s battery and a MAS 12x8 three blade prop, we get 5266 g thrust, 1566 watts, and 77A.

Kman
Oct 07, 2015, 12:26 PM
3 Blades is Better Than 2!
kman24's Avatar
Thread OP
I don't know if you noticed, but the G60 motor has a review that states that they use it in the Sebart PC-21, which is a bit smaller that the Phoenix Model version...

Run this motor flawlessly for over 200min. of fight in a Sebart PC21 (1400mm). The pwr chain is : Turnigy G60 500Kv Nano-Tech 6s 4000mAh 25-50C Turnigy Type D 14x8 prop. HK Red Brick 100A (Opto) - (overkill!! 80A would be far enough!!!) Turnigy 5 - 7.5A HV UBEC (connected to ESC battery input) HXT 4mm gold connectors Plane is balanced at 3.5kg ready to take off and the set up gives me 4.2 kg of thrust (1200-1300 Watts) while pulling 55-58A on the ESC (static measurements at 1'100m elevation). Endless vertical, high speed, quick response and a lot, lots of flight fun (and amazing sound!). Flight time is set to 8 min. and it pulls 2100-2300 mAh / of the battery capacity. Everything runs cold to reasonable warm depending on the air temp (10 to 25-28C). The only thing I noticeed is some little play in the motor shaft - bearings ??? Don't know if from the very begining… but does not look to go worse. I do not worry about reliability! Will buy MORE if this one fails ! (or a spare one) Just "the bang for the bucks"!

When I plug the G60 into Ecalc along with a MAS 13x8 three blade on 6s, we get 5133g of thrust, 1446 watts, and about 70 A. It is borderline, but as long as you aren't hard on the throttle it looks good. The MAS 12x8 three blade would be a more conservative option that could handle heavier throttle usage.

Kman
Last edited by kman24; Oct 07, 2015 at 12:40 PM. Reason: added info
Oct 07, 2015, 06:52 PM
Augermeister
dahawk47's Avatar
Kman,

Got the itch for another Tucano. How well did the HK retracts work out ? PITA to install ? I flew mine dirty but at the ultra low price for the plane, I think I can pop for retracts. Will re-use a Powerup 46. Just need a new esc. Finger on the Tower trigger....

TX-Dave
Oct 07, 2015, 07:04 PM
3 Blades is Better Than 2!
kman24's Avatar
Thread OP
Quote:
Originally Posted by dahawk47
Kman,

Got the itch for another Tucano. How well did the HK retracts work out ? PITA to install ? I flew mine dirty but at the ultra low price for the plane, I think I can pop for retracts. Will re-use a Powerup 46. Just need a new esc. Finger on the Tower trigger....

TX-Dave
The mains were pretty straight forward to install with the oleos that I got from HK. But, the nose gear was pretty involved. There was a fair amount of surgery and tinkering to get it to work well. I don't regret it, because it turned out well. Just wouldn't want to do it again anytime soon. That is why I am stoked about the PC-21... all of the retract business is sorted out That and the factory flaps are ready to go!

Kman
Oct 08, 2015, 05:03 PM
That will simply buff out
Boofhead's Avatar
Hopefully we will see some of the local Australian based suppliers of Phoenix get pricing shortly which may be significantly lower than sourcing out of the US

This is the other plane catching my interest, and is considerably cheaper than the PC-21 as it is available locally for about $ 200 less. Also I still have a ECOMRC PC-21 to build

http://www.supercheaphobbies.com.au/...rk-p-3027.html
Oct 08, 2015, 05:59 PM
3 Blades is Better Than 2!
kman24's Avatar
Thread OP
Wow, that Shark is "super cheap"

The ECOM RC PC-21 is no longer available here in the USA. I tried all summer to find one, but pretty much gave up as soon as I heard that this one was coming.

Kman
Oct 08, 2015, 06:17 PM
That will simply buff out
Boofhead's Avatar
Kman,

Pretty lame name for a hobby shop I agree

One thing I do like about the Shark is that it will be pretty unique at the field

I think I may have picked up the last ECOMRC PC-21 from a local vendor here in Sydney AU in Jan this year but yet to commence the build
Oct 08, 2015, 09:26 PM
3 Blades is Better Than 2!
kman24's Avatar
Thread OP
I got to digging around in my stash and I actually have a motor on hand that would work well for this plane. Right now I have it slated to go in another airframe, but may need to reconsider. It's very similar in spec to the Rimfire 80 motor...

http://www.hobbypartz.com/86mc451-4120-515kv.html

Kman
Oct 09, 2015, 10:10 AM
dbc
dbc
Registered User
The 1700w rating on that Exceed 4120 motor is probably way out of line. 1200w would be about max for this size and weight economy motor. It's rated over 5.8w per gram of motor weight - nearly double the conservative rule of thumb of 3w per gram.

I had an Exceed Rocket motor throw several magnets - even operating it way under its rated power.


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