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Archive for July, 2019
Posted by old4570 | Jul 29, 2019 @ 11:59 PM | 2,526 Views
MG 800 maiden ( Sub 250 project ) (10 min 29 sec)



Flying weight = 240 grams
Battery = Nanotech 500mAh 2s
Motor prop = 5A maximum current
Most of the flight was 50% or less power ( I really did fly low power )
CG was around 70mm from LE - and that's to far back folks .
I have found a slightly heavier battery , brings flying weight to 246 grams .
CG shift ? ( ? ATM = battery is on the charger as I type this )

The wings are bent the wrong way . The roll axis is really sketchy , and the wings dip at will .
I spent so much time concentrating on keeping the wings level , the entire flight was a little sketchy as a result . ( CG did not help )

ESC Problems !
Yeah , too much servo action and the motor stops .. I am thinking this might be a UBEC issue , and when the servos pull too much current the ESC shuts the motor down . Not the fault of the MG 800 , but did not lend to a great flight experience .
I have other ESC's , just no bullet connectors for the ESC / Motor

CG -
Just tried it , and looks like the new battery pushes the CG about 5mm forward !
Yeah !!! Parking 5mm's .....
That's with the battery pushed as far forward in the nose as possible .
It might make a difference ..

Flight experience .
I can deal with a rearward CG , but the roll instability needs constant attention . It's hard to fly well when you are trying to keep the wings level . It really wants to roll left or right on it's own . If you watch the...Continue Reading
Posted by old4570 | Jul 27, 2019 @ 08:40 PM | 2,446 Views


RTF Weight = 207.3 grams / This is less landing gear - and less battery .
So we have some 42 grams for a battery . To be under 250 grams .
The motor / prop combo make for a 1:1 or a bee's tit better for power to weight ratio @ 251.4 grams ( test run with 900mAh 2s battery )

Hmmm , so far ! Looks like the CG might be too far back ( Just move the battery )
I did some test gluds in the back yard , and if I toss it too hard it tends to climb and stall ..
And a very gentle toss results in a nice glide ...
Maybe some down trim on the elevator ? Or relocate the battery ?

Thats what the CG games are for !

CG games !
Wing has Deflex - This be bad ju ju ...
With a flying weight of 240 grams the deflex makes the stability less than desirable .
The MG800 has a tendency to roll on it's own accord .. This makes life interesting .
I would go out on a limb here and say too interesting for a trainer .

Trainers need to fly hands off !
FPV ? I dont think so ...
It's early days .. But the MG 800 does not like to fly Sssslow ! It is capable of going slow , it just does no like it ( my sample )

Did anyone buy a Firstar 200 from HK when it was on sale ? ( Now there is a nice bird for those starting out or for anyone not wanting a challenge )

Anyhow , trimmed enough to maiden ....

Maiden
Posted by old4570 | Jul 26, 2019 @ 09:06 PM | 3,073 Views
Hehehehehe ! Oh dear !

Was it a waste of time trying to reduce weight in the wing ?
Starting weight was 78.5 grams ..
I got the wing down to 68.4 grams ..
Then after applying 10 thousands of an inch thick laminating film
73.6 grams
78.5 - 73.6 = 4.9 grams

All that work for 4.9 grams . I did have to try , just to see what was what .
I hardly think it was worth it .
With a projected Flying Weight: 420~500g
I can certainly do batter than that .
But to get under 250 grams ?


RTF

Maiden
Posted by old4570 | Jul 25, 2019 @ 09:31 AM | 3,885 Views
Wow ,

2 servos and controls hooked up ..
Motor installed ..
Still to go are the Rx and ESC

Not glued ... Weigh = 192.5 grams

That is too HEAVY !

Foam bits were 119 grams , test fit weighs 192.5 grams

So where the heck did 73.5 grams come from .. ??????

A smaller motor wont really work , so there is weight that cant be helped .
MG 800 needs to go on a diet !
Yeah ! Weight loss time ..

Weight loss

Maiden Flight
Posted by old4570 | Jul 25, 2019 @ 12:18 AM | 3,225 Views
Measure twice , cut once ...

1) I glued in the horizontal stabs .. Since the fuse is two pieces , and the stabs are two pieces .. ( Go with the flow )
2) I used some double sided tape to put in the elevator servo . Then fitted up the controls for that side of the fuse .
2.5) I cut a small slot for the servo lead in the bottom of the servo slot .. ( There is none )
3) I will use some steel wire to join the two elevator sides ( Not included in the kit )
4) For the wing , I will try one servo , can always change my mind !
5) I used a circular servo arm cut to purpose and will allow for two connections ..

Next I will need to solder a 10A ESC ..
I want to dummy fit the motor and ESC before gluing the fuse ..
So far , a little bit of thinking ! Then some test fitting !
I want the ESC to be a clean neat install , leaving lots of internal space .. ( Dont want cabling everywhere )



Part 3

Maiden Flight
Posted by old4570 | Jul 22, 2019 @ 11:49 PM | 3,065 Views
Is anything worth waiting 3 months for ? ( Maybe a liver or heart transplant )
At last , when I saw this kit ! I thought it might be interesting .

Oh ! It is interesting !
Seriously , there are so many ways to build / assemble this kit , you might be spoiled for choice .

Build it as a Rudder / Elevator / Aileron / Motor ... OR ... as a Elevator / Aileron / Motor ... OR ... Rudder / Elevator / Motor
Ailerons - How many servos to you want to use ? 2 or only one ?

That motor mount is really well thought out , but I wont be using it . I already have a motor in mind and it simply can't be adapted to that mount .
So I will be going in a different direction with the motor ( 7x4.5 prop @ around 5A full throttle )

Single Aileron servo ? Would have to be 9g , elevator servo - may as well be 9g .
ESC , Im thinking 10A or 12A ( depending on whats on hand ) , I did just get a 6A esc . ( But a little close )
That 6A esc is earmarked for another motor and project .. ( Possibly a depron Ezio clone )

Mounting the wing ...
I see 3 ways of doing it .. Some sort of a plate glued to the fuse to put screws thru ( wing hold down )
Glue the ply plate in place , use a rod , and use rubber bands ..
Or a rod at the back and front of the wing ( holes are there ) and just use rubber bands ( X pattern ) to hold the wing to fuse old style .

MG 800 ...

Horizontal stabs are two piece , hmmm .. Would need some sort of joiner .. ( Not doing dual control rods -...Continue Reading
Posted by old4570 | Jul 21, 2019 @ 10:05 PM | 2,555 Views
UMx Whipit's (two whips) Old Modified Whip VS 100% Stock Whip ( Short Version ) (1 min 6 sec)


Took the two Whips out , was windy .
Too windy to really compare , but here is the very short version .


Picture 1

FMS V-tail 800mm - Wanted one for a long time ! ( Not a house brick like a certain Super K )
I will do a pictorial on it when the wind backs off ( Northerly Gale Blowing ) , weather says next week end .

Picture 2 and 3

MG 800 from GB , only took about 2 months to get it .. ( 3 months after checking )
It is a very interesting kit - I will do a thing on it !

Bare Bones Kit weight = 119 Grams ( Just the foam bits )
Building to Federally Mandated 250 Gram Limit for unregistered , unlicensed pilots .
Gives us some 130 grams of stuffing .

Picture 4

100cm Hand Throw Glider -
I ordered two , and I took this one out of the box . Did I mention the Northerly Gale ?
Anyhow , I had to replace the steel ballast ball for a larger one to get CG .
And it looks to be a capable glider .
Ok , it is BENT !!!! , a little here , a little there . In fact , the only thing not bent a little was the vertical stab .. That was straight for some reason .
SO it looks like a bit of time with the hair dryer is required .
BUTT !!!! - It does glide , even bent .
How to RC it ? Thats the question .
Posted by old4570 | Jul 21, 2019 @ 04:31 AM | 3,080 Views
450x New motor ( 720 ) (1 min 8 sec)


Motor be a 720 brushed quad motor ( 7mm x 20mm )
Prop is overly small
CG is too far back
Flying weight is 47 grams
Its overly breezy ..


Swapped out the prop for a larger one when I came home and did some repairs .
I ordered a 8.5 x 20 brushed motor the other day ( The 720 will have to do for now )


The other wing ...............
2 wings in the kit ...
I ordered a WLtoys F959 flight board and a 959 motor ..
ALready have some 959 folding props .
Will try again ..
My F959 has about 1:1 power to weight ..
So in a 450x it might be more like 2:1
Should be better than the 0.5 to 1 I have now ( if that ) , might be more like 0.25 to 1

That 8520 will be interesting ! 53,000 rpm
Posted by old4570 | Jul 19, 2019 @ 05:17 AM | 2,532 Views


https://www.banggood.com/custlink/DmvvSdlqQw - Product Page




450x Maiden ( Small Wing ) (5 min 8 sec)



a) Originally it was my plan to go XK A800 flight board and motor ( Matched set ) . Unfortunately the control board did not want to function correctly when I tried to mix the two built in servos .
b) Control board is WLtoys F949 , and it does not support the XK A800 brushed motor . The wing lacks power very badly .
c) Turn too tight and the wing falls out of the sky ( That lack of power )
d) I did not expect the wing to fly at all , as there is no stabilisation . But it does fly .
e) Wing flies surprisingly well
f) Wing needs more power !!!!!! Will be re-motored ASAP . Currently could not pull the skin off a rice pudding .
g) The wing just has enough power to fly - JUST . This is my fault .


Update :

Have soldering iron ..
Swapped out the motor for a small quad motor ..
This means a lot less weight ...
So the battery needs re locating .
As pictured looks to be the go ..
Another week of bad weather ahead , so hopefully wont take a week to re fly ..
So this was how I was going to do the second one ...
Hmmm , so what to do with the other wing ?
Posted by old4570 | Jul 17, 2019 @ 11:02 PM | 3,019 Views
WLtoys959 + sq12 (2 min 38 sec)




A) Yes , I nearly flew the wings off the F959 .. Toward the end of the video it got very squirrel'y so I decided to land it . Honestly , I was probably one second away from the wings falling off . Yes they were glued in , but apparently I had gone a little overly weight saving in the assembly and the windy conditions broke the glue bond . And the wings backed out of the fuse ....
B) I did want that flight video ..
C) Calmer conditions needed , but with all the bad weather . There is only one good day on the weather forecast , and that day is scheduled as UMx whipit day . I better charge some batteries ....
Posted by old4570 | Jul 16, 2019 @ 12:19 AM | 2,782 Views


Oh dear !
I really was afraid of this ..
Can't do sweet SPUDS all with mixing ..
Probably because of the auto stability built into the board .
As soon as you mix , servos stop working properly ..

BUTT ....
WL Toys 949 control board to the rescue ..
The board cant handle the XK brushed motor , just way - way to big a motor .
And around 80% throttle , the board shuts the motor down .

Solutions -
1) Smaller prop
2) Limit the throttle to maybe 70% max

Anyhow , the plan was to do the second wing with a 949 board and a much smaller quad motor ..
I guess there is plenty of time to remove the XK motor , not like its locked in or anything ...
Such is life ..
Posted by old4570 | Jul 15, 2019 @ 11:11 PM | 2,652 Views
Motor Install ..

A drop of glue , and a zip tie holds the motor in place ..
The foam cover is held in place with clear tape , as I want easy access - in case there need to be changes in thrust angle .

Control Board ..

Some knife work to make a hole for the control board ( Looks like a neat install - I might B getting better at this )
Not glued in , not until after some glide tests ..

Hard Part ..

The controls , yes this will be the tricky bit due to the design of the wing ...

Prop ..

The kit comes with a bag full of props ( 10 ) , and I found a screw that fits - so - Easy Peasy / Lemon Squeezy .

Part 3 / Problems
Posted by old4570 | Jul 15, 2019 @ 08:25 PM | 2,799 Views
2PCS KINGKONG/LDARC TINY WING 450X 431mm Wingspan EPP FPV RC Airplane Flying Wing Delta-Wing KIT from Banggood ..

A) Pictures look real nice on BG
B) Video seen so far , also look real nice ..
C) In the flesh , the 450x is not nearly as flash as in the pictures , but it still looks like a nice model .
D) The plan

I have a XK A800 flight board and motor ..
Plan is to surgically alter the 450x and transplant the XK A800 internals
Well ? Thats the plan !

The weight of the foamy bits , less everything else is just about BANG on 25 grams ..
Is that good ?
Honestly the brushed motor weighs a lot = 16.9 grams
TH e flight board is a sprite 'ly = 9.5 grams

Will see what happens ..

Part 2 - Motor / control board
Posted by old4570 | Jul 13, 2019 @ 12:08 AM | 3,715 Views


https://www.banggood.com/custlink/vKG356pJ3R

If you have been looking for FF foam gliders for projects ?
Then it looks like Banggood.com has some that might be interesting to look at .
I just ordered 2 of the ones pictured . 1m Span for under $10USD

Hmmm , budget RC goodness !

Here is a link to all the Gliders that might be interesting


Posted by old4570 | Jul 10, 2019 @ 09:50 PM | 2,424 Views
Over the hump babe !
Half a 2019 is gone ....

Looks like my SQ12 cam did not drop its guts on me , rather the Micro SD card looks to be corrupted or possibly one of those hacked / clone cards ..
Yes , buy Micro SD cards from SE Asia and you might get a hacked / clone card ..
What is a hacked / clone card ?

Take a 1GB card !
What happens is the firmware is hacked to report ? Lets say that the card is 16GB .
Then they may print a Brand Name on it and sell it as a ( BRAND ) 16GB card .
When in actuality the card is a 1GB cheap nasty generic that cost next to nothing .
ANd the consumer gets ripped !
Lots and lots of profit in hacked / clone cards ...
Mine went right into the rubbish bin , and I took out a genuine card , and all looks to work fine ..
So take two soon on the cam'ed F959

Weather Report = Horrid Weather ! Just yesterday wind gusts to 100kmh .. Looks like a entire week of horrid weather
https://www.google.com.au/search?q=m...+weather&cad=h
No respite in sight ....

New Models :

There should ( Should ) be new models on the way ...
GB is doing a take two on a model I ordered a LONG ! time ago now ... ( LAG )
From Banggood I ordered some micro wings ...
Sold as a 2 pack ...
Plan be to use the XK A800 control board and motor for stuffing in the wing .
It's a project ..

Sonic Wing I always wanted BG to sell a $50 wing , here is one .

Also I ordered a FMS ...
I will keep this purchase under...Continue Reading
Posted by old4570 | Jul 07, 2019 @ 09:19 PM | 4,031 Views


Finally !

Got here this morning ..

What to complain about ?

Those wing mounting screws are still cheap nasty soft pot metal .
I stripped one trying to remove it after test fitting the screws ...

What I cant complain about ..

The holes for the wing mount screws have been enlarged
The carbon spars in the wing , with this one , are not lose in the middle under the plastic .
Horizontal stab was not broken off as with my first one
Vertical stab looks to be better installed
Mounting the wing was relatively painless ( OK = Those soft screws bite )

Overall , I would say this Stock Whip was better made than the first one I got .

And that's as far as I have got , .... The wind is up today ..

I did go out this morning and fly my WL F959 with a SQ12 camera on it ..
Was not a success , seems the weight of the camera made the F959 swing left and right a little ..
Also I may have moved the CG a little back as the F959 was climbing all the time .
The SQ12 crapped itself after 1 minute = Maybe because of the engine vibration ?
I may try again with a SQ11 ... Slightly more forward , For CG and to get away from the brushed motor .
Posted by old4570 | Jul 04, 2019 @ 12:00 AM | 3,493 Views
Ezio 800 Take 2 (8 min 53 sec)



Take 2 :

1) Larger , heavier battery !
2) New prop ( 4x3 ) We have thrust
3) Expo was 60% for Ailerons and 80% for Elevator / I then changed these to 50% for the Ailerons and 60% for the Elevator ( With the CG at flight )

So the first thing you can see in the video is increased stability , the CG is still rearward but the 80% Expo really tamed the Ezio ..
There is thrust now ...
Before with the factory prop , 50% throttle would not pull the skin off a rice pudding , and even 100% throttle was barely enough to climb .
Now with the 4x3 , I can cruise @ around 1/4 throttle , climb with 50% throttle and have power to spare .

That extra thrust really comes in handy .

I did glide the Ezio a fair bit , and the battery was still 69% when I got home ( That walk home might have helped in that regard ) .
Am I ready to give the Ezio a thumbs up ? = No !

Put in a new motor , make the nose longer , upgrade the controls , a better prop .
In other words , a bit of R & D !

My flying weight was 190 grams . The Ezio wants to go on a diet if you really want to glide it .
I would really like to see a motor prop combo that say does 5A or less at full throttle on 2s ..
Cruises at 1/4 throttle , and CG's with say a 350mAh 2s and comes in at under 150 grams .
( R & D )

The motor is making funny sounds , so not sure how long it will last ? ....

I would really like to see a $30 USD kit around 800mm about the same size as the Ezio - F959 - XK A800 that can be built to around 100 grams ..
That would be something !

Hmmmm , I have this motor , pulls 1.8A on 2s and .................................................. ....................
Posted by old4570 | Jul 02, 2019 @ 10:32 PM | 2,551 Views
Yes , more tuning !
I really am trying to get the whip to fly like a DLG glider .
These gliders porpoise way too much , and I am trying to tune it out , as well trying to stop the stall into a breeze .

A very gentle Northerly to start which quickly switched into a southerly .
I have been playing with the wing , increasing the angle of attack .
So far by shimming the front of the wing ..
Yeah , this did not get me so far as I would have liked .
So this time I shimmed the back of the wing ... And I like the results a lot .
There is no lift , no warm air , no sun , and then it began a gentle rain .. I guess that's all sink !

I ordered a New Whip from Hearns Hobbies - May 1 .. Where is my Stock Whip ?
2 Emails and no reply .. I guess that means a phone call !
Thanks H&H , way to Jerk customers around .

I really want to try out a Stock Whip after my Whip has been thru so many mods .

UMx Whipit - Trim flights (8 min 27 sec)