shannah

My Feedback: (5)

What is the consensus on prop size for the dualsky 6360-12T? In reading previous posts I see guys are using 20x15 and 21-14. Any recommendations?

woodie

20.5 x 12W is slow but a real tractor on uplines and good brakes on downline
20.5 x 14 is pretty good all around prop good speed but less braking
21x13 is good combination of tractor and braking
20x15 for those special windy days
22x12 slower, good tractor and good downline braking

All sizes refer to APC props

Woodie

shannah

My Feedback: (5)

Thanks!!

OhD

Don, any comments on the new batteries? Are they holding up"

Jim

Chris Moon

My Feedback: (8)

You might try the 21-14 as well. Dave S. has been trying it out and it seems to work well I have one on my test plane with a few flights on the 21-14 and it seems like another good option.

woodie

So far they are. About 30 flights on them and I haven't been gentle. Don

Dean Pappas

So how do you like the Dualsky 6360?
At that price, I've got to know!
Dean Pappas

OhD

I've got about 150 flights on mine and I find it very consistent. So far zero maintenance. Less than a buck a flight and getting less every flight. Now if we can get 200 flights out of $200 worth of battery packs, the cost per flight favors electric.

I still like the 22x12 better than the 20.5x14. The 20.5x14 might do better on the 11T. Maybe a winter project.


Jim O

woodie

I have over 300 on my original 6360-12T with no maintenance other than replacing the bearings early on. I thought they needed replacement but it made no difference and the replacements have gone over 250 flights so far. Others have had to replace bearings because the motor got 'noisy' but the bearings are real cheap to replace. Standard inline skate sizes. One large and 2 smaller bearings. Costs about $12 to replace all three.

Don

shannah

My Feedback: (5)

Looks like I'll have to order a few more props and give them a try. I think I'll need a new spinner also since it seems that the Dualsky has a 8mmx1.25. The axi has a shaft the size of a baseball bat. Does the dualsky fit an APC prop without having to ream it out?

RC_Pattern_Flyer

My Feedback: (1)

slight amount of reaming is required to fit the APC

Chuck Hochhalter

patternflyer1

My Feedback: (11)

I ordered some cheap bearings for the prop shaft difference between the axi and the dualsky.. Found them on E ba y.. They have the inside dimension of 8 mm and outside 12mm.. I didn't have to buy a new spinner, or new props.. Works great..


Chris

shannah

My Feedback: (5)

Good idea. I think I'll try that.

patternflyer1

My Feedback: (11)

It works well... The bearings are made by Duratrax. You can probably find them at your LHS.. Saved me alot of money in spinners and props..
Attached are a few pics of how I used them on my Abbra..

BTW... I'm running the 11T on a 22x12 and it has almost the same power as the Axi F3A motor IMO.. Didn't like it on a 20x13.. Which is what I liked on the F3A.. Good motor though.. I'd recommend it.. And have.. lol

Chris

shannah

My Feedback: (5)

I was wondering what the performance difference was between the 11T and 12T. It seems that both are being run. What's the power difference between the two?

OhD

I believe they are both rated at 2400 watts. The difference is prop load times rpm. If you want more rpm with a smaller prop go for the 11T. If you want a larger prop go with the 12T. I suspect Chris is over 2400 watts with the 11T and 22x12. Then again we only average about 900 Watts flying pattern so maybe the motors can take more peak power as long as the average is low enough. Right now we are kind of battery limited so we don't push the motors too much.

Jim

shannah

My Feedback: (5)

Thanks Jim.

I am waiting for the 12T to arrive. I am running the Axi now, but am looking forward to the comparison with the Dualsky 12T. I like the numbers with the 12T and a larger prop, since a larger prop will probably do better on my plane. These motors are relatively inexpensive so its feasible to try different combos. Heck, the Dualsky doesn't cost much more than a 40% CF prop, so cost isn't a real barrier. You'd never be able to say that about IC engines. "Which is better for my plane, YS or OS? I'll buy one of each and let you know". That isn't going to happen any time soon... LOL.

OhD

You're right. In fact we've been talking about having two planes, one with each motor, for windy/calm conditions. One can also change motors in a few minutes if you want to go that way.

I know you know how to determine if you are exceeding the power limitations, Steve, but for those who don't, divide the max power by the peak voltage under load to determine the max current allowable. For a 2400 Watt motor with 36 volts under load the max current should be 66.6 Amps. If your prop is pulling more current than that you are exceeding the rating of the motor. (I'm sure the 2400 W assumes adequate cooling so make sure you have it.)

Jim

shannah

My Feedback: (5)

Thanks Jim,

I plan on measuring the performance with different props to see how it does. Hopefully it will be in the green zone. Cooling is another source of concern for sure. I have been flying my Axi without a spinner since it felt pretty hot (especially in the summer). I keep meaning to bring the IR gun with me, but haven't done that yet. I wish someone would make a spinner with spiral intake slots cut in it for airflow.

I still have trouble relating the motor specs to real world performance. I grasp the power calcs ok, but trying to figure out how to relate # of turns and kV or rpm/volt into prop size and real RPM expectation still hasn't sunken in. I guess I'll learn that as I go.

Steve.

patternflyer1

My Feedback: (11)

You may be right Jim.. However I don't go full throttle except in my run up on the ground. Plus, it's cheap.. lol.. It is a listed prop for the motor, not that that means much..

As for the Axi cooling. Here's how I did it.. Well my test spinner before I did it to my anodized spinner..

Chris

Dean Pappas

Hi Chris,
What did the 11T do (or not do) on a 20-13 that you didn't like? Was the power low, and if so was the current too low as well? Was it an overload?

thanks in advance,
Dean

shannah

My Feedback: (5)

I tried the 20x15, 21x14, and 21x13W on my 6360-12T. I measured the max current on all of them and they all came in around 63 amps. The performance of the 20x15 was similar to the Axi on the 20x13 but wasn't as strong as the Axi. The 21x14 seemed too slow for me and needed a thrust change so I only flew it once. I didn't like the pull on the top corners since it seemed to not pull across the top corners like the Axi on 20x13. I liked the 21x13W on this motor. That, for me, was a nice setup. Good vertical. No feeling of running out of pull like the 21x14. Constant speed up and constant speed down. Good braking. And I didn't have to adjust thrust offset, at least I couldn't tell in the wind.

I checked the 20x13 from the Axi and it only pulled about 54 amps at WOT. Big change between that and the 20x15.

I'll check the battery capacity shortly to see how much I drained with these prop setups.

Next I'll try the 22x12. On a calm day I will try the 21x14 again (with an additional washer of right thrust).

Steve.

shannah

My Feedback: (5)

The 21x13W used 2780mah (from my 4100mah hextronic packs) flying a P09 sequence and extra pass or two for 8 Min flight time. Looks like I can push it a little harder. Winds were about 10mph. Like I said, I like the combo and the power consumption is fine so I won't be afraid to push the throttle on uplines and corners.

AndreaBresci

Hi,

do I have a question, how much does it consume and how much ampere does it throw an AXI /F3A with the 20x13?


Thanks

Andrea

patternflyer1

My Feedback: (11)

[/quote]
Hi Chris,
What did the 11T do (or not do) on a 20-13 that you didn't like? Was the power low, and if so was the current too low as well? Was it an overload?

thanks in advance,
Dean

[/quote]

The power felt low to me as compared to the Axi F3A with the 20x13.. That's all.. Didn't put a meter on it as I didn't like it.. But then again, it could be my motor.. Right around the same time, I started getting that twangy sound at a little over half throttle.. Not sure why.. I'll swap it out with my other 11T and retry.. I'll put a meter on it first though.. Maybe at the weekend..

C