mick15

I have just purchased an AXI 5330 Fai it turns a 20X11 E prop at 6000 on 10sx2p is this about right?

M

Apanda

I get 5800 on 20x11.
and 6450 on 20x10.

rgreen24

My Feedback: (6)

What about a 22x12 or a 21X15w

mick15

I do have a 20x12 when I have run it I'll let you know, ta.

m

mick15

I have a Rhapsody which I bought second hand, Iv'e only flown it once as the original motor went pop. It was a 5330-18 and the winding carrier broke loose and it destroyed itself.

If the Fai is turning a 20x11 at 6000 won't a 20x12 or anything larger be too much prop?

M

woodie

I don't know what lipos you are using, but with TP5300s, the AXI F3A turns the 22x12 at about 5700 rpm static (on the ground) at about 76 amps. 21x13 at 6040 rpm static at 72 amps. 20x15 at 6100 rpm static at 76 amps. In the air, you can add about 400 rpm to these figures.

If you are using newer 20C type lipos, you will get slightly better figures on rpm due to the 20C cells holding voltage better than the older type cells. Performance is noticeably better according to my friends who are using the newer cells. I have not flown them.

Woodie

mick15

Thanks Woodie

I'll take some measurements over the weekend and post again ta.

m

Pattern_is_Fun

Hey Mick,

This is a little off topic but : What performance are you looking for? How much does the Rhapsody weigh? What class are you flying? How are your baffles placed to cool the motor? Did you mount the motor from the rear or from the front? AXI's are fine motors, I ran one most of last year with few problems - I did loose a motor when the motor mount broke and the AXI pulled right out of the plane - but I don't think this was an AXI issue! I was using a 22x12 at the time, and changed to a 21x13 (as that's what I had in my field box), and ran the 21x13 for the rest of the year with good results. I had my motor mounted on a front bulkhead (screwed in from the front) but would change next time to mount from the rear and have a small "O" ring guide around the front of the motor. This will allow for better cooling into the motor - as the front bulk-head prevents airflow through the motor. Any of the above combinations will work fine, pulling a 11-lb plane around fine, but as in all electrics, watch the cooling - and I'd say if you have never changed the positions of the air-flow baffles, you have not done enough to get the cooling correct.

My thinking on the above is that the AXI will pull your plane fine with any of the props mentioned - you will experiment and find the prop you like - which may be different from what others like - based on some of the questions above. In order to be successful over a long period of time you should consider; how you fly (do you use the throttle a lot? - what is your average current draw?), how fast you fly, how long your sequence is (which class you fly), and how you are cooling the motor - these will contribute to how happy you are with the motor. The AXI is a fine product - analyze your needs and determine what is best for you.

Good Luck.


sc

mick15

Wow loads of questions!

I used to fly pattern at masters level, had an OS 140 RX 15.5x12APC four blade, great engine in a 2m pattern model called a New Solution, could'nt get on with four strokes.

Havn't weighed the Rhapsody think its about 10.5-11lbs. I flew it today on the 20x11 and whilest it had plenty of vertical it did'nt suit my old flying slyle though it was very windy, I got the impression I needed less diameter and a lot more pitch, flying for 12 minutes I used 4000mah. I don't believe in it's present form I could fly the schedule at the distance I used to fly, I do though accept my flying style will probably have to change to suit electric.

The motor stayed cool as did the batteries, I'll try the 22x12 next time out and see what that does. I have a 16x16 somewhere I may try that could be totally useless we'll see

M

woodie

M,

You might want to try the 21x13 APCe mentioned by SC above. It will give you more speed (which is what you are probably used to) and it will still pull like a tractor going up. If you haven't tried it yet, try leaving the throttle alone until you need more speed in the uplines (hard to do) but I think you will be surprised at how much reserve power you have. If you can convince yourself to leave the throttle alone more, you will find your mah usage per flight will begin to drop. Using the 21x13 and the F3A, flying Masters at about 150 meters with reasonable speed you can probably do the sequence at about 3500 mah. Less with more practice.

I use about 3800-4000 mah for the FAI P07 sequence and I don't fly slow or close, takes about 9 to 9.5 minutes.

Woodie

patternflyer1

My Feedback: (11)

I'm using 27-2900mah with the F3A with the Flight Power 3700's flying the new Masters sequence on a 22x12. Just switched to a 21x13 because of the wind and remembered why I used to like it..
This is in a 11lb 3 ounce Evolution..

Edit, I forgot to mention that I am flying in 20 mph wind + at these numbers. Still not used to the plane as it's only got 20 flights.
Numbers should come down I think to 25- 2800 mah I feel.

Chris

mick15

Thanks for the answers guys, got some ideas to try, if ever this horendous wind goes away.

m

patternflyer1

My Feedback: (11)

You have the wind also eh?

Getting tired of it over here also, lol....

Chris

mick15

Huh, learnt something about elec today, tried that 16x16apc model hardly got off the ground!!
I found the 20x12 the best.

m