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Search: Posts Made By: Dr Kiwi
Forum: Power Systems 02-04-2014, 04:02 AM
Replies: 12
Views: 536
Posted By Dr Kiwi
12x6 Sport:...

12x6 Sport: http://www.apcprop.com/ProductDetails.asp?ProductCode=LP12060
Forum: Power Systems 11-18-2013, 04:39 PM
Replies: 8
Views: 540
Posted By Dr Kiwi
One useful rule of thumb for glow to electric...

One useful rule of thumb for glow to electric conversions is:

watts = cubic inches x 2000

Thus .020 is ~40W, .049 is ~100W, .15 is ~300W and so on.
Forum: Power Systems 11-04-2013, 08:15 PM
Replies: 6
Views: 375
Posted By Dr Kiwi
Just one pedantic correction.. rule of thumb is...

Just one pedantic correction.. rule of thumb is "input of ~3W/g"
Forum: Batteries & Chargers 02-03-2013, 02:27 AM
Replies: 2
Views: 495
Posted By Dr Kiwi
Are you sure you set the voltage/cell count...

Are you sure you set the voltage/cell count correctly?
Forum: Power Systems 12-04-2012, 05:04 PM
Replies: 10
Views: 963
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: 963
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 09-02-2012, 12:19 AM
Replies: 6
Views: 918
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 08-15-2012, 06:36 PM
Replies: 12
Views: 1,043
Posted By Dr Kiwi
Reverse the throttle servo on the Tx?

Reverse the throttle servo on the Tx?
Forum: Power Systems 02-08-2012, 03:37 PM
Replies: 8
Views: 2,783
Posted By Dr Kiwi
Don't cut down props.. your chances of getting...

Don't cut down props.. your chances of getting perfect balance are close to zero... and since the prop tips do most of the work, you are likely to end up with an un-balanced, inefficient prop!
Forum: Batteries & Chargers 01-15-2012, 02:21 PM
Replies: 6
Views: 1,584
Posted By Dr Kiwi
It seems as if 6s would be the way to go: 5s...

It seems as if 6s would be the way to go: 5s would be wimpy.

Motor: E-Flite Power 60 Outrunner 400KV; 400rpm/V; 2.7A no-load; 0.06 Ohms.
Battery: Thunder Power TP5400 (G4 ProRace 40C) (40C); 6...
Forum: Power Systems 01-01-2012, 04:33 PM
Replies: 14
Views: 2,053
Posted By Dr Kiwi
Try searching for the part number with google. ...

Try searching for the part number with google.

The part number is <table style="width: 128px; height: 97px;" rules="NONE" border="0" cellspacing="0" cols="1"><colgroup><col...
Forum: Power Systems 12-01-2011, 10:58 PM
Replies: 1
Views: 591
Posted By Dr Kiwi
Rule of thumb would say that a 500W motor is...

Rule of thumb would say that a 500W motor is roughly equivalent to a .25 glow. A123 cells are slightly lower nominal voltage (3.3v) than Lipo (3.7v)... so that needs to be taken into...
Forum: Power Systems 10-16-2011, 05:08 PM
Replies: 13
Views: 1,355
Posted By Dr Kiwi
To reiterate what Mike has said.. I'd have...

To reiterate what Mike has said.. I'd have thought that for a Gee Bee, with that huge cowl, you'd want the largest diameter prop you can fit.. in order to get the most useful prop disc area... a 4-5...
Forum: Power Systems 10-16-2011, 04:32 AM
Replies: 13
Views: 1,355
Posted By Dr Kiwi
With a "plastic hub" and the "parkflier only...

With a "plastic hub" and the "parkflier only warning" I'd suspect that these are not good for anything much more than 150W-200W.....but that is just my guess.
Forum: Brushless Motor Construction 10-05-2011, 02:09 AM
Replies: 1
Views: 1,311
Posted By Dr Kiwi
This can be wound to be 1800Kv:...

This can be wound to be 1800Kv: http://www.gobrushless.com/shop/index.php?app=ccp0&ns=prodshow&ref=S2212KIT

Follow the motor winding tutorials so that you can select the gauge and wind to get you...
Forum: Power Systems 08-31-2011, 03:39 AM
Replies: 3
Views: 832
Posted By Dr Kiwi
Park 300 is configured for mounting in front of a...

Park 300 is configured for mounting in front of a firewall... use the prop saver....

....or behind the firewall, using the collet adapter on the exposed shaft (replace the O-ring screws with set...
Forum: Power Systems 05-13-2011, 03:22 PM
Replies: 17
Views: 965
Posted By Dr Kiwi
If you are putting more than 200W through it, or...

If you are putting more than 200W through it, or spinning it at > 7200rpm.... then you need something other than an SF or RS prop. The APC E would be fine since it is rated for 21,000rpm. A GWS HD is...
Forum: Power Systems 02-16-2011, 04:42 PM
Replies: 13
Views: 3,571
Posted By Dr Kiwi
That PowerUp 450 is simply a re-badged Suppo...

That PowerUp 450 is simply a re-badged Suppo A2217K-8T (1100Kv)... here is what it can do:
Forum: Power Systems 01-30-2011, 08:02 PM
Replies: 16
Views: 1,083
Posted By Dr Kiwi
They come from measured data on my Thrust...

They come from measured data on my Thrust Stand... though the comparative figures for 6x4 versus 6x5.5 come from a 2212 motor, not the 2208... I think the 20% would translate well enough, no matter...
Forum: Power Systems 01-30-2011, 07:36 PM
Replies: 16
Views: 1,083
Posted By Dr Kiwi
A 6x4 APC E is only going to draw ~11A, and a...

A 6x4 APC E is only going to draw ~11A, and a 6x5.5 APC E draws about 20% more than that..... so it shouldn't draw more than 13A-14A... still okay for that motor.
Forum: Power Systems 01-30-2011, 01:38 AM
Replies: 16
Views: 1,083
Posted By Dr Kiwi
This might be far too much of a leap, but a Suppo...

This might be far too much of a leap, but a Suppo A2208-8 will get you a LOT more speed.
Forum: Power Systems 01-28-2011, 03:18 AM
Replies: 9
Views: 1,191
Posted By Dr Kiwi
The Lipo won't need much size or C rate since the...

The Lipo won't need much size or C rate since the motor is rated for only 7A/10A burst... and a 9x6 probably won't draw close to those. Heck, I'm the conservative one, yet I'm sure that the 40A ESC...
Forum: Power Systems 01-27-2011, 10:24 PM
Replies: 10
Views: 1,404
Posted By Dr Kiwi
Dan Sny creates magnificent "made in the USA"...

Dan Sny creates magnificent "made in the USA" motors [MicroDAN].

http://www.gobrushless.com/shop/
Forum: Beginners 01-17-2011, 09:40 PM
Replies: 23
Views: 1,579
Posted By Dr Kiwi
Certainly, if the RX battery is dead then so will...

Certainly, if the RX battery is dead then so will be everything else. Since your ESC has a built-in BEC then you really don't need a separate Rx battery at all. The servo lead from the ESC will just...
Forum: Power Systems 01-17-2011, 07:54 PM
Replies: 19
Views: 2,832
Posted By Dr Kiwi
This one is 840Kv... but there is no way it can...

This one is 840Kv... but there is no way it can get you 900W on 3s at under 60A....at a more prudent 50A it will only be getting you ~550W max.....probably marginal for 5.5-6lb.
...
Forum: Power Systems 01-17-2011, 04:22 PM
Replies: 19
Views: 2,832
Posted By Dr Kiwi
One way would be to find a motor suited to 6s......

One way would be to find a motor suited to 6s... and simply run two of your 3s 5000s in series.

http://2dogrc.com/product/dualsky-xmotor-4260ca-6t-1100w-70size.

You could use a .46 equivalent,...
Forum: New Product Announcements 01-08-2011, 09:46 PM
Replies: 3
Views: 1,660
Posted By Dr Kiwi
I think Gohmer is correctly indicating that...

I think Gohmer is correctly indicating that this... http://www.wattflyer.com/forums/forumdisplay.php?f=38... is the place for your advertisement.
Forum: Power Systems 01-07-2011, 01:22 AM
Replies: 53
Views: 7,924
Posted By Dr Kiwi
Here are Bruce Abbott's findings:...

Here are Bruce Abbott's findings: http://homepages.paradise.net.nz/bhabbott/Servo.html
Forum: Power Systems 12-16-2010, 03:15 AM
Replies: 8
Views: 3,567
Posted By Dr Kiwi
A more recent thread of mine:...

A more recent thread of mine: http://www.rcgroups.com/forums/showthread.php?t=645168&highlight=thrust+stand
Forum: Power Systems 12-12-2010, 01:07 PM
Replies: 75
Views: 7,767
Posted By Dr Kiwi
Strangely enough Chellie's HXT 3548, which I...

Strangely enough Chellie's HXT 3548, which I guess weighs about a 160-170g (a Turnigy SK3548 is 171g), seems to be doing well at the stated power-in of 480W.....despite my lack of a technical degree,...
Showing results 1 to 30 of 173

 
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