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Posted by old4570 | Nov 09, 2019 @ 09:16 PM | 663 Views



This is the motor that is supposed to go on the little 450x wing .

Lets start with the 3025 prop ..

2s - 145 grams of thrust - 5.59A - 26,400 rpm - 45.5 watt
3s - 268 grams of thrust - 10A - 35,000+ rpm - 118 watt ( Getting hot )

3830(E) prop ... ( 383E )

2s - 191 grams of thrust - 8.21A - 22,000+ rpm - 62 watt

3330(E) prop ( cut down 383E )

2s - 170 grams of thrust - 7.61A - 22,800 rpm - 54.9 watt



Sorry guys , just look at how that current / power peaked from 2s to 3s with the 3025 prop ...
The larger pitchier prop would most likely peak even higher and just cook the motor .
The motor seemed to behave well with all the props tested ... Even ran solid to 35,000 rpm ..

I suppose if you were made of money , you could afford new motors as you cooked the ones you had racing ..
But seriously , 268 grams of thrust . From such a small motor ... !!!
You would probably kill the motor if you stayed on the hammer for any length of time , but I think this is the best motor tested so far for a 11 size .. ( From what I have ) ..

On 2s , with a well selected prop , I would dare say a sub 100 gram quad would scream fast enough for anyone (?) .
And powering a micro wing ? ( Yeah )
I just need to remove the 1103 from the 450x and give that a test ...

For testing props ? , I don't have a suitable motor .. I thought that 1106 might have done the job , but I was wrong .
Not that there are that many 1103 - 1106 props

Lets Compare !

1103 - 7800kv
...Continue Reading
Posted by old4570 | Nov 08, 2019 @ 12:55 AM | 925 Views
It was time to put the 1104 4000kv on the test stand ..
It's raining and blowing a gale outside , so what to do ?

2s Battery

3025 - 69 grams of thrust / 19,100 rpm / 1.69A / 13.9 watt
333E - 86 grams of thrust / 16,500 rpm / 2.44A / 19.2 watt
383E - 96 grams of thrust / 15,300 rpm / 2.5A / 21.6 watt

I think the motor wants more prop on 2s

3s Battery

383E - 140+ grams of thrust / 19,000+ rpm / 4A+ / 49 watt ( Ran HOT )
333E - 140 grams of thrust / 20,700 rpm / 4.1A / 46 watt ( Did not run HOT )
20,000 rpm = 120g / 41.8w

3025 - 129 grams of thrust / 25,000 rpm / 3A / 36.5 watt ( happy camper )
20,000 rpm = 80g / 21.2w

65mm - 80 grams of thrust / 32,000 rpm / 1.69A / 20.7 watt
20,000 rpm = 30g / 6.2w


Posted by old4570 | Nov 07, 2019 @ 08:41 PM | 1,274 Views
Posted by old4570 | Nov 06, 2019 @ 11:32 PM | 1,303 Views
2s Test

383E 2 blade prop = 160+ grams of thrust , but the motor is cooking ( be that 6000kv )
333E 2 blade ( cut down 3835 ) = 157+ grams of thrust / 22,000+ rpm ( motor is cooking )
@ 20,000 rpm = 127 grams of thrust for 43.8 watts

3025 2 blade prop = 136+ grams of thrust @ 5A + / 25,000+ rpm
@ 20,000 rpm = 74 grams of thrust for 22.3 watts

65mm 2 blade prop ( pictured ) = 87 grams of thrust @ 3.2A+ / 33,000+ rpm
@ 20,000 rpm = 31 grams of thrust for 7.9 watts

This motor is supposedly 1-3s , and for me 6000kv is probably to high a KV for actual use .. ( Unless if you plan on running 3s and small props , in which case it might be ok ) But the high rpm ?
For actual use , maybe 3000kv to 4000kv would be a better choice . Especially if you want to run less current and more prop .

Even with such small motors , if you are running 2-3s , I just dont see the need for high KV .. ( Thats just me )

4v x KV ( 1s )

4x 3000kv = 12,000 rpm
4x 4000kv = 16,000 rpm
4x 5000kv = 20,000 rpm

8volt ( 2s )

8x 3000kv = 24,000 rpm
8x 4000kv = 32,000 rpm
8x 5000kv = 40,000 rpm
8x 6000kv = 48,000 rpm

I would say that for 2 to 3s , those high KV numbers are just silly ... ( For numerous reasons ) , one being the high current which tuns to heat . The other being that larger props are more efficient .
I did buy this motor for testing props ... But now , after seeing 160+ Grams of thrust ... I think I feel the need for a 1106 3000kv motor ...

UPDATE :

3s Testing ..

65mm Prop .
Wow , this motor does not like pulling more than say 35,000 rpm ..
As you approach 40,000 rpm the motor craps out ..
It did stay cool how ever , but peak RPM is reached around 50% throttle on 3s ..
Thrust is around 100 grams ..

I will try the 3025 next

3025 (3s)
33,600+ rpm / 9A+ / 225 grams of thrust / 108 Watts / Cooking !!!!!
20,000 rpm / 78 grams of thrust / 28.5 watt
Posted by old4570 | Nov 06, 2019 @ 08:36 PM | 1,205 Views


Bee 490mm wing kits ( 2x )
2 wings apparently ..
I'm not supposed to buy anything till Xmas , but !
Posted by old4570 | Nov 05, 2019 @ 10:16 PM | 484 Views
DW 600mm flying wing ..

Another wing I have had my eye on for a while ..
Since it was on sale recently , I decided it was time to drop the hammer .

As pictured ( everything in the picture ) , the weight of the kit is 52.8 grams ..
This would leave us some 47.2 grams to play with to try and make weight ( 100 grams / minus a few grams )

Hmmm , a sub 10 gram motor ( 1306 ? )
two 5 gram servos ?
A 5 gram ESC , and micro RX ( less than 10 grams total )

So around 30 grams maybe ? leaving some weight for a 2s battery .



I still have two motors owing to me ( somewhere in the postal universe = I hope )
A 1306 and is the other a 1406 (?) Nope a 1410 !

This waiting for stuff
Posted by old4570 | Nov 04, 2019 @ 02:51 AM | 2,396 Views


This is a very interesting kit , and the thing that I really wanted to know was the base weight !
As pictured , with the components as is , the weight is 68.5 grams .

I don't think this one will go sub 100 grams , with only some 31.5 grams to play with . ( Servos / Rx / ESC / Motor / and the battery )

Link = https://www.banggood.com/custlink/DDvG6eoW6q

Though , you should be able to get it in the air for around $50 USD with budget components .
Posted by old4570 | Nov 01, 2019 @ 09:15 PM | 2,750 Views




Tested on the Turnigy V3 test stand

2s

7045 2 blade = 12.3A / 470 grams of thrust / 10,800 rpm
6045 2 blade = 8.2A / 384 grams of thrust / 13,400 rpm
5051 3 blade = 8.57A / 295 grams of thrust / 13,190 rpm

3s

5051 3 blade = 13.66A / 500 grams of thrust / 17,100 rpm
5042 3 blade = 10A / 434 grams of thrust / 19,800 rpm
6045 2 blade = 13.2A / 653 grams of thrust / 17,400 rpm



I don't have a 6x3 or 5x3 that will fit this motor .. So I had to use props on hand that fit .
I did see over 150 watts with the 3s battery , the motor just got a little warm . So at around 150W looks like we are starting to load up the motor . How much more it will take before it cooks ? I would say that on paper the motor is under rated quite a bit . Personally I would be happy to run this motor to 150W for short bursts , like take off or a speed pass .
I have two wing kits , one is 800mm . ANd I have seen a lot of people put 2204's in that 800mm wing . If it can be built to 150 grams or less ? Then we might be looking at a thrust to weight ration of 4.3 to 1 or better ? on 3s . ( Thats crazy ) or 3:1 on 2s ....

Motor Link @ banggood
Posted by old4570 | Oct 31, 2019 @ 07:34 PM | 3,374 Views
BG been having a bit of a sale ..
So I purchased two wings I have had my eye on ..

1105 5000kv motor came / This is the motor that should be in the 450x wing ( well , should ) . It's the best packaged motor I have ever seen .

That twin wing FF powered model got here : And the CG is w.a.y ( way ) back from where it should be . I slapped on a BBQ skewer and used it to find the CG . Yeah as pictured is close .. No I dont like the model at all , so why did I rush to buy another ?
Might have something to do with the Lipo powered motor and timer .. This thing screams , and has some serious grunt for motion . I think the power system is worth the money alone .. Also ordered another FF SU27 .. PLAN = take the power train out of the slug ( twin wing ) and put it into the SU27 FF model .. ( Oh dear ! ) Could be interesting ( could be )

1103 in the 450x - Got some 65mm props , ??? RPM as the GT power tach can't get a solid read ..
Though the AMPs is down , maxing out at around 3A or a little less ... ( Full throttle )
I kind of think that prop is too small as the RPM peaks around 75% throttle and did the tach read 39,000rpm or was it an error ?


I have two wings to play with .. and two small motors on the way ..
Maybe two more sub 100 gram wings ?
we will see ...
Posted by old4570 | Oct 29, 2019 @ 08:54 PM | 2,020 Views
Continues from Part 2

So I have verified RPM / Current Draw / Thrust to my satisfaction .
And I am happy to trust the V3 stand to report the truth to me . ( well , as close as it can )
This is not a laboratory grade instrument , but the results are consistent / repeatable / and ball park enough to be very useful .

So exactly what can the V3 test stand do ?

Power Meter

If you watched the video in part 2 ?

Battery - You can see the voltage sag under load ! , as well the current supplied . Did anyone think that perhaps you could use the test stand to TEST your battery pack ? I see plenty of posts on RCG where people ask questions or complain about their batteries . How hard would it be to replicate the conditions your battery has to put up with and then actually see in real time what the pack is doing !
That's are far as I'm getting into batteries - because it's a can of worms ! and we are talking V3 test stand right now .

Motor - There is a saying , a chain is only as strong as it's weakest link . And we can expand on that to = A quad racer is only as fast as it's slowest engine .
With a test stand , you could test your motors for the weak link .

ANd Thrust

Propeller - This is unfortunately not as uncomplicated as it should be .. Unless you use a large enough motor with a high enough KV so that all propellers can be tested with as little induced variable as possible .
This is why we need constants ..
The motor...Continue Reading
Posted by old4570 | Oct 28, 2019 @ 11:28 PM | 2,110 Views
Turnigy V3 thrust stand .. (1 min 57 sec)


Quick and dirty video showing the thrust stand in use ...

I checked the thrust results :

The way I did it was the cheap nasty and EASY way .
I have digital scales , so I just powered up the test stand , powered up the scales .
Zeroed the scales , and then applied the scales directly to the test stand ..

Then I could compare both digital read outs ..
This is by no means laboratory accurate , but as near as I could tell the test stand was replicating the force from the digital scales .

So the test stand looks to give real world results .

....


PART 1

Part 3
Posted by old4570 | Oct 27, 2019 @ 10:38 PM | 1,846 Views
PART 1 ( of many many parts )

At last a motor is here !
Be a budget 2204 / 2300kv 2-3s ( 12A - 120W - 14 pole )

The very first thing I wanted to check was RPM accuracy as I had seen a complaint or two about this !
Now the very first thing anyone has to understand is :
You have to input the correct pole count for your motor !!! or you will get the wrong RPM read out .
This motor is 14 pole ( advertised as ) .

Setting the test stand to 14 pole :
setting motor speed to 10,000rpm as reported by the test stand
My GT power tacho reported some 9200rpm .. ( 3 blade mode as it was a 3 blade prop )
So where is the discrepancy ? With one or the other or in between ?
I would suggest the read outs are close enough to make any data viable and usable .

The prop was not well balanced .
The test stand being metal , means quite a bit of vibration against a hard surface ( table top ) . ( yeah , balance the prop )
So this is all I have done ..
Mounted the motor , connect things up , and do a quick test run checking RPM ..
Next I will have to check that current draw reading .. ( And balance the prop )

AMPs Test :

I just checked , and the AMPs look to be good ..
So it looks like I can trust the current draw reported by the test stand ..
I threw a 4 blade on as it runs much smoother ..
So I can definitely do some RPM / Watt's / @ RPM range / Thrust - tests ....

So I guess I will have to do some thrust accuracy testing now ..

PART 2
Posted by old4570 | Oct 27, 2019 @ 04:53 PM | 1,548 Views


Maybe not quite that bad ( To hell and back ) ..
I cut down that 3025 and just had to see how it changed things ( 2725 ) , I mean I was getting more RPM .

Off I went , it was overcast and then the sun came out driving up the humidity !

By the the time I got to the football field it was fully humid ( This be bad for me ) and I was sweating ( more bad )
Sweat seems to attract flies , and I got me some half dozen or so once I started flying ( both hands on the Tx )

So there I was flying with half a dozen flies crawling over my face .. The stress was monumental ( I despise flies ) ...
I was forced to make two emergency landings ( power off crashes ) to swat the flies away as I could no longer stand it .
It was so bad my fingers were a quiver on the Tx as the flies crawled on my face .
Not being able to shoo them away was so gawd awful ..

Oh yeah , the 450x was undamaged , they be so light that once you cut power it's very hard to damage them . ( I really like that ) .
And the cut down prop , I don't know ? Was it the flies , or is the 450x actually flying faster ..
I will post a short video soon .

450x with a cut down prop (0 min 44 sec)


Once airborne , I cut the throttle back down bellow 50% , take off throttle is around 70%
Posted by old4570 | Oct 24, 2019 @ 06:28 PM | 2,954 Views
Wow ...

What a huge difference KV makes to peak current ..
These small motors are teaching me something .

1103 7800kv 19000rpm @ 3A ( 50% throttle ) Peak current over 7A ( 3025 prop )
7800kv x 8v = 62,000 RPM ..
Obviously the motor is horrendously over propped .
And when the motor is operating outside its Current / RPM range it converts energy to heat ( everyone knows that )
But still , over 7A peak current for such a small motor .

1104 4000kv 22000rpm @ 2.3A ( 100% throttle ) 3025 prop .
That is just a huge difference ..

I am not prepared to run the 1103 long enough to get a steady RPM reading , last time I did that I cooked the motor .
So I cut the prop down :
3025 cut down to 2725
@ 3A current draw rpm is now 23000+
At 50% throttle current is down to 2.6A
Prop was perfectly balanced , and I have no more props ( 3025 ) to play with ( to cut down ) ..
I have some 3020 on order .. ( ? when they get here )
The 1103 have a high kv for that 1s operation , so while it's a cute motor ! It may not be the best motor choice for the 450x wing .

The ESC in the 450x wing is equipped with a plug , so swapping motors should be relatively simple and painless .
For now I will keep going with the 1103 and try out some more props and see how it goes ..
There should be a 1105 and a 1106 on the way .. ( 1105 is 5000kv )
That 1105 is the motor meant for the 450x wing .. And I just had to go 1103 ( Silly boy )
Posted by old4570 | Oct 23, 2019 @ 11:45 PM | 2,650 Views
1104 4000kv from Feebay ...

Came at last :

Quick test =

1s battery ESC combo = 10400 RPM with the 3.8x3 prop
2s battery = 15600 RPM with the 3.8x3 prop

4000kv x 4 volts = 16000 RPM
4000kv x 8v = 32000 RPM

Hmmm , motor ran cool enough on 1s , and I think it should take more prop ..
On 2s it seemed to be maxing out near 3A for that 15600 RPM ...
Now the earlier 1103 that I cooked needed about 7A to pull this RPM with the same prop . ( Cut down prop )
Same prop = 17100 RPM @ 6.4A , cut down prop hit 19500 RPM around 7A and then the motor cooked !

The ESC used is the one out of my MG800 , and at full throttle the motor was cutting .. This was the issue with the ESC when it was in the MG800 .
So looks to be a faulty ESC , @ 3A in anyways .. Bellow 3A it seems to run fine .
Motor starts to warm around 2.5A ..

I dont know if this is a 1s / 2s motor or a 2s / 3s motor ?
Runs well enough 1s , but lacks thrust ..
So just might see how much prop I can put on it !

2s there is plenty of thrust ..
I put a plug on it so I can swap it around ( ESC's ) and I can put it in the 450x wing as the 1103 is also plugged .
Just ordered some new ESC's as the 2s one is faulty .. So will replace it ASAP


3x2.5 Prop ( 3025 )

2s ...

21700 RPM with a peak RPM of 22000 @ 2.24A with a peak Amp's of 2.3A ( Motor stayed relatively cool )
Posted by old4570 | Oct 22, 2019 @ 06:01 PM | 2,973 Views
FF Bird -
Wind has backed off , and so I tried the bird again ..
Need to tweak the foam a bit ( TE of the wings ) and it glides really well .
I was playing with it in the front yard and once tweaked it glides with very little altitude loss .

3025 Prop and 1103 - ( 450x )
Went to the park ( sink hole ) and gave it a fly ..
For launch more power is needed to get some thrust for that much needed momentum .
@ 50% throttle the 450x was struggling .. At around 75% throttle it launched very cleanly .
Once in the air and moving I was able to back the throttle to around 30% give or take some and still maintain decent speed .
I was expecting more noise , but no . Turned out to be reasonably quiet .
So this combo might fly @ 1A , I might try some throttle pre sets ( 3 position switch ) and lock the throttle at 1A and see .
I think I want a prop with more thrust though . The 3.8x3 is good , but might just load the motor too much even though the data sheet says it would be operating withing acceptable parameters . ( Cough / Cough )

Thrust Test Stand -
Waiting on motors , the motor I want to mount for prop testing is a 1106 ..
Also have a 220? on the way for larger props .
Just waiting for the stuff I ordered ( Painful ) , there are tests I want to do .

FF SU-27 -
Oh man ! This thing does not like the wind at all .
Even puffy breeze is enough to upset it .
Probably best indoors .

STUFF -
Yeah ! Waiting on stuff ..
Always waiting .. A watched pot never boils ?
I want my stuff !

Posted by old4570 | Oct 19, 2019 @ 09:27 PM | 3,280 Views
FF Bird from eeBay (0 min 56 sec)


Was on Feebay and saw this 2 Pack of FF Birds (?)
So , the first thing to come to mind was = Can I RC it ?

Well , first things first ..
It's windy , really windy .
So nothing small is going to glide well , especially something funky like a FF Bird .
I had to try though ..

So I was able to make the bird glide across the back yard , not really sure I want to bother RC'ing it !
Not really that good !

Might make for a fun chucky , but for how long it will be interesting ?

Certainly needs some trim to get it to glide , usual rules apply !
Posted by old4570 | Oct 17, 2019 @ 11:30 PM | 1,901 Views
I know , I said I was done with the 1103 .... But it's such a cute motor !

RCX 1103 7800kv ( 2 - 3 s )

If you look at the data sheet , well it say's the motor will do 10A and over 100 Watt .
I am highly dubious .

My first 1103 was DOA
My second , well I cooked that motor testing a cut down prop . ( around 7A )

I got some 3025 props with the motor .
Motor is installed in the 450x micro wing .
With the 3025 prop amps is a little north of 7A 2s( again )
The motor gets hot , the motor wires get hot ..
I only ran 100% throttle for about 3 seconds , which was enough for substantial warmth .

2s test :

At 1A I recorded some 12,000+ rpm
At 2A I recorded some 16,000+ rpm
And at 3A I recorded some 19,000+ rpm
With the 3025 prop .
3A is right around 50% throttle ( Physically on the Tx )
And at 3A current the motor wires are getting warm ..
Not sure how anyone would rate this motor size 10A ?
I would suggest half that as something to avoid continuously .

Anyhows , blowing a gale outside right now 40kmh with wind gusts over 70kmh

Will take the 450x out ASAP ( as the wind allows ) , really want to try out that 3025 prop ..
Must remember to limit myself to about 50% throttle .
Posted by old4570 | Oct 15, 2019 @ 12:38 AM | 2,038 Views
Free Flight SU-27 found on Feebay ..
With discount , cost around $5 USD or less .

Wow ! Came fully bent in the post ( see pictures ) ..

But it was an opportunity to test some ideas I had .
Got out the old clothing iron , bumped the temp to 80deg C and proceeded to iron out the wrinkles .
Nope , not doing a good job !
Bumped the temp to about 120deg C and I was just starting to melt the foam ..
At just over 90deg C the iron was doing a half decent job .
I had 2 layers of house hold paper between the foam and the iron at all times .

But there was a lot of bent to go around .
The motor had got bent as well and would not straighten out .
So I had to cyno it reasonably straight .

Assembling !

So the parts have these little tabs that get pushed thru holes .
The foam is SOFT , I mean soft .
Best to use needle nose pliers , very carefully push the pliers into the hole and just barely thru ..
Grab hold the TAB , and pull it thru ..
Much easier than trying to push the tabs thru the very small tight holes .

Once assembled .. Its not overly bad !
CG looks to be about right , and you just need to tweak the control surfaces for a decent glide .
It's windy outside , so the SU 27 glides like a tissue ..
Really need some UBER low wind ( no wind ) or possibly a decent indoor space .


Free Flight Micro Capacitor Powered SU27 (1 min 3 sec)


Was windy yesterday ..
This morning was calm , but a slight drizzle ..
Oh that weather !
Posted by old4570 | Oct 11, 2019 @ 05:44 PM | 2,077 Views
Sorry - re upping as Utube ruined the video ..
Re - encoded with handbreak - Hopefully Utube wont ruin it ?

HobbyKing Micro SU27 (8 min 4 sec)




I woke up 6.30am and looked out the window ..

I was encouraged by what I saw = Nothing ! Not a puff of air !
Got dressed and walked to the Park / Football field ..

6 axis flight control was OFF ! ( No stability control )
Rates are still 50% with no expo .
Seriously , this flight was with like 5mm to 10mm of stick throw = IF THAT !
The micro SU27 is super responsive , and it is also so - WAY Stable .. ( I have that forward CG with the 300mAh Nanotech 2s )
Rates could come down or a decent chunk of expo added .

But the flying conditions were perfect ( No wind / no breeze / nothing )

Seriously , with maybe 25% rates and maybe 25% expo , this could be a NOOB plane when there is no wind .
All of that flight is maybe 50% throttle , around half way I cut the throttle back more .

That battery plug takes a beating on landing , can't be helped .

I know you guys don't like watching video , but if you are interested in this Micro SU27 , you want to watch the video ..