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Archive for April, 2018
Posted by old4570 | Apr 26, 2018 @ 08:32 PM | 2,985 Views
A1405 motor from GearBest (0 min 56 sec)


So we know that peak current was 3.15A / 25 watts with all props tried , 5x3 - 5x4 - 6x3

So this tells us that none of those props really loaded up the motor , also tells us the 3000kv claim is just a claim .
I put the motor to the Tacho ..

4.5x3 = just over 11,000 RPM > Oh dear !
6x3 = just over 10,000 RPM

My guess would be that this might be a 1200 - 1400kv motor , ? ( 1400 at best ) ..
I could be tempted to try a 7x3 if I could find one physically light enough , because this is a very small motor or maybe a 5x5 ...
Posted by old4570 | Apr 26, 2018 @ 05:35 AM | 2,577 Views


Well those 1.5mm screws showed up today .. ( I thought I had a 6A ESC ? - Must have misplaced it )
Anyhow .. I have a 12A ESC I can test with .

Motor is 1s - 2s so we will be using a 2s Battery ..

GB gives no specs on the motor ..
HK has a motor !

A1405
30 Watts
6A
3000kv

So using a 2s battery and ...

5x3 - 5x4 - 6x3 and a cut down 5x3 to 4.5x3 .

First I tested current draw and Watts , every prop was around 3.15Amp and 25 Watts and the motor ran cool . So obviously I am not maxing out the motor at all . Then for kicks I got out some cheap electronic scales and I tested for thrust . Motor is mounted to a wood block , I am setting the motor up for pusher ( push down ) to see how much weight the scales register . Obviously with the motor off one sets the scales to zero ...

5x3 prop gave around 110 grams of thrust .. 5x4 prop was about 115 grams and the 6x3 was around 120 grams , but obviously this is static thrust . Pitch would have something to say about flight performance , so I will go with the 5x4 ...

Well with about 3A current draw , around 110 grams of thrust .. I think the motor will fly my wing , especially if I can make it 100 grams RTF ..

Not sure the GB motor can live up the the HK motor specs , just does not feel like a 3000kv motor .. Its dark and tomorrow I will tack the motor with the 4.5x3 prop as it did rev out a little more on the little spinner .
Posted by old4570 | Apr 25, 2018 @ 07:26 PM | 2,596 Views
My wing is here from FastTech dot com ...
I put it on the scales and got 46 grams ( for the foam components ) , that leaves me some 54 grams to play with to get to my goal of 100 grams RTF
Just waiting on the 2.5g servos now and some small ( 1.5mm ) screws
Posted by old4570 | Apr 23, 2018 @ 01:26 AM | 2,137 Views


For review : Nitecore EC22

Product Page @ Nitecore

Nitecore EC22 provided for review by Nitecore



I was looking at flashlights one night ( as I some times do ) and I spied the Nitecore EC22 . Two things grabbed my attention right away , the first being the infinitely variable output and the second was the rotary dial . Never mind the 1000 lumen output or the fact that it it's all put in a very handy package powered by a 18650 or two CR123 . The very first thing I did on receiving the EC22 for review was to take it for a walk . Nope ! , I did not measure current or put it in the light box or anything else . I wanted to experience the EC22 first and then see what the numbers were . When I went for my walk I swung past a friends place and let him and his wife have a play with the EC22 . Now my friend took to the EC22 like a duck takes to water , without any prompts from me he had turned on the light and was adjusting the output . For a non flashaholic to simply use the light so easily tells me that the user interface is universally simple , kind of reminds me of a transistor radio with its rotary dial for on and of and volume control .

After visiting my friend I swung past the local park ( its a big park ) and the great thing is that the road / foot path is raised several meters above the park allowing some one with a flashlight a nice elevated position for shinning a light . For a light with small head and short reflector the EC22 did not...Continue Reading
Posted by old4570 | Apr 15, 2018 @ 08:11 PM | 2,418 Views
Ordered another wing = I am going to try for 100 grams RTF
Ordered smaller servos 2.5g ,
Was going to test the little motor , but I don't have small enough screws = Ordered and more waiting ..
I have ESC's , I have a Rx .. and that cute little motor ..
Just need to wait for everything else ... ( Come on scientists - Invent a matter transporter already - Getting too old to wait for everything )

Yeah , waiting on lots'a stuff !


Posted by old4570 | Apr 06, 2018 @ 01:23 AM | 2,328 Views
Spirit 600 Wing $19.95 Wow , I haven't seen the Spirit 600 available for a while from the usual sources , but looks like Fasttech have some . ( I think I have to buy one while I can - I like this wing ) Really want to build one @ 100 grams RTF

52 pages for multirotors , 52 pages of multirotor goodness @ fasttech dot com .

Happymodel Phenix60 600mm Wingspan FPV EPO Mini Flying Wing Banggood currently does not show the Spirit 600 , but they do have the Phenix60

Eachine E013 Micro FPV RC Drone Quadcopter With 5.8G 1000TVL 40CH Camera VR006 VR-006 3 Inch Goggles - With Goggles Is this a good price ?

Volantex 2.4G 4CH V765-2 765-2 Super Cub 750mm Sport Park Flyer RTF If you want something slightly larger , but not too large .