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Search took 0.06 seconds. Search: Posts Made By: Dr Kiwi
Forum: Power Systems 04-01-2013, 02:15 AM
Replies: 2
Views: 268
Posted By Dr Kiwi
http://www.draneer.com/OlympicFlying/200709_Extra3...

http://www.draneer.com/OlympicFlying/200709_Extra330L_Dendron/


He used 15x7x3 on 6s
Forum: Power Systems 03-23-2013, 02:34 PM
Replies: 3
Views: 318
Posted By Dr Kiwi
I use a servo tester for running motors on my...

I use a servo tester for running motors on my thrust stand:
Forum: Power Systems 03-23-2013, 02:29 PM
Replies: 11
Views: 357
Posted By Dr Kiwi
Just to be unutterably pedantic, centripetal...

Just to be unutterably pedantic, centripetal force (or lack thereof) is the key here:

According to Newton's third law of motion, for every action there is an equal and opposite reaction. The...
Forum: Power Systems 03-01-2013, 03:42 PM
Replies: 35
Views: 863
Posted By Dr Kiwi
Just for grins - and to see how different the...

Just for grins - and to see how different the results might be - I just ran the numbers on some data from one of my sailplanes.

now imagine how much unloading you might see between static and...
Forum: Power Systems 02-25-2013, 01:25 AM
Replies: 35
Views: 863
Posted By Dr Kiwi
What motor is this? Are you saying 55A is the...

What motor is this? Are you saying 55A is the distributor's rated max. (typically optimistic) or is it a "real" number?
Forum: Power Systems 02-19-2013, 11:30 PM
Replies: 10
Views: 344
Posted By Dr Kiwi
Hobby King:...

Hobby King: http://www.hobbyking.com/hobbyking/store/__21478__NTM_Prop_Drive_28_26_1000KV_315W.html?strSearch=2826-1000

Of course this is HK.. so it is rated for 315W, whereas the FirePower 370...
Forum: Power Systems 02-08-2013, 01:09 AM
Replies: 32
Views: 640
Posted By Dr Kiwi
Since DriveCalc was mentioned here is a plot for...

Since DriveCalc was mentioned here is a plot for a Turnigy C3530-1100 (the Aerodrive version is not in there).. it suggests that 10x5 APC E loads the motor appropriately (about 70% efficiency and...
Forum: Power Systems 02-04-2013, 09:30 PM
Replies: 28
Views: 700
Posted By Dr Kiwi
Certainly brushed is easier, but do you really...

Certainly brushed is easier, but do you really want to stay in the dark ages.. in a few years it might be very hard to even find brushed gear (motors/ESCs).

Brushless with multiple ESCs and long...
Forum: Batteries & Chargers 02-03-2013, 02:27 AM
Replies: 2
Views: 225
Posted By Dr Kiwi
Are you sure you set the voltage/cell count...

Are you sure you set the voltage/cell count correctly?
Forum: General Electric Discussions 01-17-2013, 01:33 AM
Replies: 22
Views: 478
Posted By Dr Kiwi
Mike, I'm puzzled... my typical test series for...

Mike, I'm puzzled... my typical test series for motors [and I've bench tested hundreds] comprises bursts to WOT for maybe 15 secs (just enough time to record the data..volts, amps, watts, rpm,...
Forum: Power Systems 01-11-2013, 06:26 PM
Replies: 8
Views: 404
Posted By Dr Kiwi
I think that the 9x6 APC E is heavier than that...

I think that the 9x6 APC E is heavier than that 52g motor might like... a 9x6 APC SF would be a better choice, though it might put you close to the motor's limit for amp draw (rated for 13A: 9x6 APC...
Forum: General Electric Discussions 01-08-2013, 03:21 PM
Replies: 9
Views: 288
Posted By Dr Kiwi
I'd ask the RC Boat guys.. I imagine a...

I'd ask the RC Boat guys.. I imagine a "water/boat prop" would be better than an "aircraft prop", wouldn't it?
Forum: Power Systems 12-19-2012, 12:42 AM
Replies: 3
Views: 327
Posted By Dr Kiwi
Or use your left thumb judiciously.

Or use your left thumb judiciously.
Forum: Power Systems 12-09-2012, 03:57 AM
Replies: 7
Views: 389
Posted By Dr Kiwi
A useful read:...

A useful read: http://www.rcgroups.com/forums/showthread.php?t=1747756

It is suggested that you need 250-300W driving an 8x4.. probably ~1400Kv.

This would do it easily on 3s:...
Forum: Power Systems 12-09-2012, 03:53 AM
Replies: 12
Views: 705
Posted By Dr Kiwi
Denny, Minor correction needed: "As...

Denny,

Minor correction needed:

"As other's have indicated, those brushed motors are now kind of a paperweight".
Forum: Power Systems 12-08-2012, 02:16 AM
Replies: 12
Views: 705
Posted By Dr Kiwi
I think the 550 Turbo is a lot heavier than the...

I think the 550 Turbo is a lot heavier than the stock SuperCub motor. [if that is a brushed 480 it's about 103g]

These are some specs I found:

The Kv is 2528Kv, Io = 2A, Rm = 0.085 ohms, 25A...
Forum: Power Systems 12-04-2012, 05:28 PM
Replies: 5
Views: 431
Posted By Dr Kiwi
Something like this seems about right to spin...

Something like this seems about right to spin 12x8's on 4s... you probably only need around 300W per motor.... but some to spare is always good. If you come in at 4lb, 150W/lb should be more than...
Forum: Power Systems 12-04-2012, 05:04 PM
Replies: 10
Views: 420
Posted By Dr Kiwi
What size prop are you thinking of for your 2s...

What size prop are you thinking of for your 2s use? That will determine the Kv required.
Forum: Power Systems 12-04-2012, 04:59 PM
Replies: 10
Views: 420
Posted By Dr Kiwi
A 28mmx16mm flux ring limits you to 22mm diameter...

A 28mmx16mm flux ring limits you to 22mm diameter (or less) stator motors.. so you can use 2208, 2212, 2215...maybe 2216 (like one SunnySky I tested)... but not 2217.
These are several 2215 Scorpion...
Forum: Power Systems 11-15-2012, 08:04 PM
Replies: 4
Views: 550
Posted By Dr Kiwi
Any combo can be made to work, but lower voltage...

Any combo can be made to work, but lower voltage means higher current draw... which means lower flight time [and because of I^R, more waste heat to be dissipated].

Cheers, Phil
Forum: Power Systems 11-12-2012, 06:06 PM
Replies: 17
Views: 18,742
Posted By Dr Kiwi
http://www.nitroplanes.com/tacon.html

http://www.nitroplanes.com/tacon.html
Forum: Power Systems 11-02-2012, 08:11 PM
Replies: 4
Views: 490
Posted By Dr Kiwi
Get the original bearings out... and measure them?

Get the original bearings out... and measure them?
Forum: Power Systems 10-27-2012, 12:51 AM
Replies: 6
Views: 525
Posted By Dr Kiwi
This is the one I've used for 6-7 years without a...

This is the one I've used for 6-7 years without a glitch! http://www.gobrushless.com/shop/index.php?app=ccp0&ns=prodshow&ref=SERVOTESTER
Forum: Power Systems 10-20-2012, 02:02 AM
Replies: 19
Views: 825
Posted By Dr Kiwi
All I can suggest is that both Wattmeters must be...

All I can suggest is that both Wattmeters must be incorrect... unless you have some weirdly wound motor, you CANNOT get a Rimfire .15 to draw 46A/500W with a 10x5.

Motor: Great Planes Rimfire...
Forum: ParkFlyers 10-19-2012, 11:18 PM
Replies: 2
Views: 417
Posted By Dr Kiwi
I'd ask the guys at Castle Creations.. they are...

I'd ask the guys at Castle Creations.. they are very helpful and they will surely take an interest since it is their ESCs you are frying.
Forum: Power Systems 10-13-2012, 03:31 AM
Replies: 19
Views: 825
Posted By Dr Kiwi
On 5 min flight, draws around 1600 mah from a...

On 5 min flight, draws around 1600 mah from a fresh batt.

If you are only using 1600mAh your average current draw is only 19.2A... so how is it that you are measuring 60A on your initial flight...
Forum: Power Systems 09-17-2012, 11:39 PM
Replies: 9
Views: 1,098
Posted By Dr Kiwi
A 10x6 GWS HD on a 6v Speed 400 at 4.09:1, using...

A 10x6 GWS HD on a 6v Speed 400 at 4.09:1, using 3s Lipo, is a good combo for a small parkflyer:

10.8v, 7.3A, 82W, 5700rpm, 410g thrust
Forum: Power Systems 09-02-2012, 12:19 AM
Replies: 6
Views: 605
Posted By Dr Kiwi
If nothing is going through a dead ESC the...

If nothing is going through a dead ESC the analyzer can't tell you anything. The motor probably burnt out on its own... nothing to do with the ESC... did you over-prop it...?

Try the ESC with a...
Forum: Power Systems 09-01-2012, 04:07 PM
Replies: 5
Views: 537
Posted By Dr Kiwi
To get the same Kv, the motor with the fewer...

To get the same Kv, the motor with the fewer poles would need more turns (and thus maybe thinner gauge wire)... or the motor with the greater number of poles would need fewer turns (and would use...
Forum: Power Systems 09-01-2012, 04:03 PM
Replies: 6
Views: 605
Posted By Dr Kiwi
Plug it in-line between battery and ESC and when...

Plug it in-line between battery and ESC and when the motor runs it will read volts/amps/watts... maybe mAh used etc. You can try different props and see whether the amps stay below the motor's limit.
Showing results 1 to 30 of 500
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