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Old Jul 26, 2011, 12:57 AM
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United States, CA, Claremont
Joined Mar 2011
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Just finished my build and I'm running the rimfire 1.20, CC ice 100, 2 3S 4000 40c and 17x8. Wattmeter showed 25.4 V, 2551 W and 113.9 A at WOT. I didn't adjust the esc, any suggestions? Has anyone used the 16x8?
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Old Jul 26, 2011, 06:55 AM
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Branford, Florida
Joined Jun 2010
602 Posts
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Originally Posted by jwill84 View Post
Just finished my build and I'm running the rimfire 1.20, CC ice 100, 2 3S 4000 40c and 17x8. Wattmeter showed 25.4 V, 2551 W and 113.9 A at WOT. I didn't adjust the esc, any suggestions? Has anyone used the 16x8?
Ive been using a 16x10 with weak 6S 5000 mah packs, it only pumps out about 56 A static. I'm waiting on new ec5 connectors and then my transformation to 8S will be ready to maiden, I suspect I'll need to prop down a bit (16x8) to keep within motor and esc(ice75) limits. Hoping to find out this coming weekend if the connectors arrive in time.
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Old Jul 26, 2011, 11:59 AM
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United States, CA, Claremont
Joined Mar 2011
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Originally Posted by ACKopter View Post
Ive been using a 16x10 with weak 6S 5000 mah packs, it only pumps out about 56 A static. I'm waiting on new ec5 connectors and then my transformation to 8S will be ready to maiden, I suspect I'll need to prop down a bit (16x8) to keep within motor and esc(ice75) limits. Hoping to find out this coming weekend if the connectors arrive in time.
ok thanks ill try a 16x10 and a 16x8. and maybe some different batteries, thanks
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Old Jul 26, 2011, 03:25 PM
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Branford, Florida
Joined Jun 2010
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Originally Posted by jwill84 View Post
ok thanks ill try a 16x10 and a 16x8. and maybe some different batteries, thanks
You're probably better to start with the 16x8. I just looked at the Kv for your rimfire, you're 450 and I'm only 370. If you've got decent batteries it should work quite well with the 16x8.
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Old Jul 26, 2011, 05:39 PM
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United States, CA, Claremont
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Originally Posted by ACKopter View Post
You're probably better to start with the 16x8. I just looked at the Kv for your rimfire, you're 450 and I'm only 370. If you've got decent batteries it should work quite well with the 16x8.
ok thanks, ill try the 16x8.
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Old Jul 26, 2011, 07:04 PM
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United States, CA, Claremont
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so i went to the 16x8 and heres what i got:

22.42V at the beginning of test
101.7A
2186W
and 21.32V after about 7 to 8 seconds at WOT.

also i noticed the motor makes a consistent high pitch screech. the noise was there with the 17X8 as well. is that normal for this motor? its the loudest when prop first spins then quiets as rpm's increase. most noticeable at low idle.

after running the batteries down a little i ran it again:

22.04V
94.3A
1934W

obviously i understand it will unload in the air and the numbers will be less. the motor says it should be 1800W consistent with a burst of 2300W and the esc says 100A max. i couldn't find a burst rating for the esc. now my next question is can i lower the numbers by getting lower c rated batteries? and if so, will it ruin the batteries?

once again my setup is:
rimfire 1.20
cc ice 100
2 x 3S 4000 40C

any advice is appreciated thanks.
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Last edited by jwill84; Jul 26, 2011 at 07:31 PM.
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Old Jul 27, 2011, 01:07 PM
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Branford, Florida
Joined Jun 2010
602 Posts
The 101.7 amps with a full charge is at the very limit of that esc. Castle only list it's rating as "max current" and does'nt indicate it as a burst limit. I personally would find it acceptable but most say you should have a 20% head room for a continious current draw.

I would not expect the motor to actually screech but some do whine. You can try different timing settings on the esc and see if it helps. I have the Rimfire .80 on a different plane using a different ESC, it does whine to an extent but does not screetch at all.

If you try using lower "c" rated packs it will probably put you within the Ice 100 limitations but will compromise the batteries themselves as they'll be overworked and won't last very long at all. Safest bet if your concerned is re-propping with a slightly smaller 16x7 or even try a 17x6.
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Old Jul 27, 2011, 02:37 PM
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United States, CA, Claremont
Joined Mar 2011
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I appreciate the info, thank you. Ya I fell pretty comfortable with numbers cuz I know they will lower when the plane is moving. Would it hurt anything if I were to lower the throttle high EPA a small amount like 5%?
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Old Jul 27, 2011, 07:22 PM
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Branford, Florida
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Originally Posted by jwill84 View Post
I appreciate the info, thank you. Ya I fell pretty comfortable with numbers cuz I know they will lower when the plane is moving. Would it hurt anything if I were to lower the throttle high EPA a small amount like 5%?

I dont think it will help. As I understand it a ESC doesnt actually work by moderating the amount of power it sends to the motor based on throttle position, it governs the amount of FULL available power in pulses. Basically at full throttle it sends many more (or longer) pulses of full power per second and many fewer pulses (or shorter) per second for lower throttle settings. I would still think this would be safer but have been led to believe this still has the potential for issues on an overloaded system.
One other thing I thought of today, when you check your current draw under a static load some props will give a lower amp rating due to slippage or cavitation, this can actually result in higher than expected current loads in flight once the airframe comes up to speed and the prop can actually get a better bite. Most of the time it works in your favor but not always. Strap your watt meter in the plane for a true in flight reading to see if your gaining or losing current demand while flying to be sure. Just make sure to avoid full throttle acceleration on take-off as that will pretty much give the same peak reading as a static test.
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Old Jul 27, 2011, 08:08 PM
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United States, CA, Claremont
Joined Mar 2011
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i'll be sure to check my numbers in the air when i maiden. i tested the epa adjustment. i guess my idea was if i limited the travel of the stick movement it couldn't hurt anything, it would just be like flying at like 3/4 throttle instead of full throttle (just an example not actual #'s). So i turned the epa down from 100% to 90% and i got 22.2V, 87.3A and 1758W. as far as the screeching, your probably right its just whining. this is the biggest motor i have used so its just louder than i'm use to. once again the info is appreciated, thanks
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Old Jul 31, 2011, 01:43 PM
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Branford, Florida
Joined Jun 2010
602 Posts
16x10 on 8s with Hyperion ZS4025-14

Went WAYYYYYYYY over what I expected. I know my old 6S packs were shot but I never expected this much increase in current draw with the new GensAce packs and stepping up the voltage at the same time.

I ran a short 2-3 second wot burst to see where I was. The Castle data log came back @ 4039 watts and 133 amps Lets see, Hyperion says for this motor, 2100 watts max and 90 amps continious, yep, I'm just a tad over.

I switched to EC5 connectors for the new set-up but my watts-up meter is deans, need to change them out then try some different props. I'm thinking 15x7 to 8 or 14x10. Would like to keep as much speed as possible so I'll start with the 14x10
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Old Sep 07, 2011, 02:17 PM
Nexxa
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Montreal, Qc, Canada
Joined Oct 2003
106 Posts
I convert mine to Electric. I flew it with a .95AX for 2 seasons (a little boring)

I start a cheap electric conversion after a successful one with my Revolver 40.

I bought a this motor: Tacon BigFoot 160
http://www.hobbypartz.com/96m608-big...335-245kv.html

and use some of my stuff:
2x Turnigy 6S 5000 30c (12S config)
Castle HV Phoenix 85

It took me one day to remove old stuff, cleaning, building the battery tray (12S configuration). I do a quick static test yesterday and reach 2700 watts. I can’t go higher in static test, the prop start to make a bad noise (prop stalling), so the reading will not be good pass this point.

I estimate (fresh lipo / 3.7v):
APC 17x10E
3900 watts /3300 watts
85A / 75A

Apc 16x10E
3300 watts / 2700 watts
70A / 62A

4 to 9 minutes, depend!
The plane was 10.5 ready to fly with an OS 1.20AX
Now it's heavier by 2.5lbs. (13 lbs, ready to fly)

Tomorrow will be the test flight
Pics and probably a flight video will follow by Friday.
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Old Sep 12, 2011, 09:20 AM
Nexxa
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Montreal, Qc, Canada
Joined Oct 2003
106 Posts
Finally I put online a small video on youtube.

I do 4 flights that day. Everything run cold, too cold!
I ordered a 16x12 and 16x14. The 16x10 gave me 63 amps, 45volts in flight, a total of 2700 watts WOT (fresh lipo). I aiming 3300-3600 watts in flight.

But for the moment I have a 5 minutes flight wide open all the time and a cool motor, no more than 40 celcius.

I experiencing some "timing issu" with the Castle Phoenix 85 HV. At low RPM, the prop (motor) make a weird noise if I accelerating too quickly. The noise disappear with speed. I will test other timing until it goes. You can hear it when I pull out from a "touch and go" or at take off.

http://www.youtube.com/nexxa1974#p/a/u/1/gsybFZ4Eu6c
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Last edited by nexxa; Sep 12, 2011 at 09:25 AM.
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Old Sep 16, 2011, 12:51 PM
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Joined Oct 2009
1 Posts
Hi, I have one of this Revolver 70. What I found out is the stock hinges for elevator are not good Idea as they loose out when high speed is achieved. How is it possible to fix it?
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