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Posted by old4570 | Jan 23, 2021 @ 06:24 PM | 1,431 Views
UMX TT signal loss (5 min 22 sec)


Re routing the antenna helped some ! But not enough !

So I have punched more holes in the TT and this time routed the antenna out the bottom of the fuse , maybe 1mm .

Range checking was good , at least double what I got before .

Butt ! @nd its a huge Bee Hive ! This antenna definitely seem to have a dead zone .. And that appears to be when it is directly pointed at the Tx .
Thats why I have it sticking vertically down .. Which does not eliminate the possibility of the dead zone ..

Last time , the prop did come lose ! Hence the funny sounding motor run .
That small cheap nasty self tapping screw seems to have stripped out the prop shaft .
So I had to replace it with a hex head screw . More butchery of the foam spinner , required .

Do I have to mod the antenna ?
Posted by old4570 | Jan 22, 2021 @ 06:13 PM | 1,903 Views
UMX Turbo Timber with Rudder Mix (5 min 3 sec)


I mixed in some rudder in stability mode to tighten the turns ..
From memory the mix is for 20% rudder added to the ailerons , and it really helps in tightening the turns .
I was thinking that the TT would be a nice tight space flier but in stability mode it's a little lazy with just bank and yank !
So mixing in a little rudder really helps kick the tail over . And with the TT having such excellent slow speed handling , kicking the tail does not hurt .
After a little over 4 minutes flight time , I had 53% battery when I came home .

The vertical performance is not brilliant and then again it's not terrible , maybe a little ho hum !
I will have to see about a 2 blade replacement prop .

Signal Warnings - I lowered the warning point / signal strength .. No joy there !

So today I came home and punched some holes in the side of the fuse and pulled the antenna thru !
Then tapped it to the outside of the fuse , just a bit of tail sticking out . ( pictured )
Tripled my range check . That's got to be nice
Posted by old4570 | Jan 21, 2021 @ 06:22 PM | 4,432 Views
Micro Tundra is back (5 min 21 sec)


It's back ! Flaps work , and there is power ! ( To spare )

1306 4000kv motor swap
10 or 12 amp ESC swap
5030 gemfan prop
Zippy 350 2s battery
158 grams flying weight



I think I like it !

The climb out is amazing and I terminated the climb with a loop out , as otherwise it would have just kept going .. ( Unlimited Vertical ? )
It was spectacular .

My 2nd climb out was disrupted by the wind , as I wanted to do one with flaps deployed , but the wind just pushed the MT over into a loop . So yeah , got to the field just in time for the breeze to pick up . If only I had been 5 minutes earlier .

So , can I say - happy camper ? Motor and ESC swap have given me Power ! , weight has not increased a lot - Now 158 grams .
Flies like stock except for the crazy vertical performance .

I think I can live with the MT now .
Posted by old4570 | Jan 20, 2021 @ 07:55 PM | 3,755 Views
XK A160 with slightly more forward CG (7 min 19 sec)


Battery sits deeper into the nose now + no slop .
Hunts less .
Rolls much nicer ! I mean it rolls like a Jam Roll !

New problem

Moving the CG ever so slightly forward ! Now I dont have enough elevator to hold the stall .
My A160 when it stalls - It just drops it's nose . Before the CG shift , the elevator could just - and I mean just - hold the nose up !
Now it cant . My control rod is flexing quite a bit _ Full Up ! So those foam hinges are limiting elevator movement .

Something else to fix .
Posted by old4570 | Jan 19, 2021 @ 07:45 PM | 4,110 Views
Ok , looks like I have found an issue with the CG making the A160 a little touchy feely !

Looking inside the battery bay , there was a bump in the foam ( from the moulding ) ..
I got some steel wire , heated one end up ( red hot ) and melted away the bump / protrusion ..

Now the battery slips in further forward . But it's a real slop fit !
So I got some 3mm depron scrap and glued it to one side of the battery bay .
Now the battery is a non slop fit with just a small amount of friction grip .

And for the heck of it , a picture of my micro Rx and servos that replaced the flight control board .

A160 has been handled a lot - paint peeling ! Things needed fixing .....
Posted by old4570 | Jan 19, 2021 @ 05:58 PM | 4,263 Views
XK A160 with more down thrust (7 min 43 sec)



I may have previously mentioned !
That I removed the motor+ mount and rotated it 180deg for more down thrust !

Because - When I applied power , the nose would lift and the A160 would climb seriously hard over 50% throttle ..
Up to 50% was ok but once I wanted more ( like 100% ) the A160 just lifted it's nose .

Rotating the motor mount seems to have seriously improved things . I did change my elevator setting causing the A160 to climb . I did put in some down trim , but looks like I have to go back where I was .. But never the less a serious improvement .

Having solved one issue , looks like CG might be next . It does hunt up and down a bit and drag it's beehive in turns ( signs of a rearward CG )
Oh well ! Not the end of the world ( like the death spiral ) . I will have to see if I can push / make room . for the battery further forward .


Playing with the CG
Posted by old4570 | Jan 16, 2021 @ 07:30 PM | 9,045 Views
BG has some really nice deals for those in the USA ..

https://www.banggood.com/custlink/mmDhZPmbdR - OMP S720 $83 USD
https://www.banggood.com/custlink/m3DhItvbEV - Dragonfly 700mm $30 USD
https://www.banggood.com/custlink/DG3h9PGNRe - WL Toys F949 $52.50 USD
https://www.banggood.com/custlink/mvGyIFmbyA - FMS 800 V tail $69 USD
https://www.banggood.com/custlink/KmDh9t3bdf - Dancing Wings 1200mm T12 Balsa Trainer $61.50 USD

Oh man , ..... That T12 look interesting .
Posted by old4570 | Jan 12, 2021 @ 04:50 PM | 3,328 Views
UMX Turbo Timber 2nd maiden (5 min 31 sec)


2nd Maiden .. No flaps and I turn the stability off .

I have my ailerons on triple rates - 50% - 75% and 100%

@ 50% general flying is fine , but there is not enough aileron to do rolls
@ 75% general flying is fine , but there is almost enough to do rolls
@ 100% general flying is fine , and there is enough to do rolls

I have 40% Expo across the board ... And if I wanted to throw the TT around I might drop that , maybe 10% expo @ 100% rates for a little more aileron snap !

No stability , flies like a plane without stability . So no more being lazy . It flew slow with no bad tendencies . And you dont need flaps to fly slow . The added benefit of flying less flaps is that there seems to be better battery life . ( Less drag / wasted energy )

Signal issues - Hmmm , better this time around ? Maybe my warning is just set too high ?
Not exactly like you can get to the flight board , cos the plane is glued shut .
Posted by old4570 | Jan 08, 2021 @ 10:39 PM | 2,929 Views
UMX TT Signal Warning !

If anyone watched the video of my TT maiden ? They may have noticed I was getting a lot of signal warnings .
Even close up I was getting warnings . ( That telemetry thing )

I had to find a picture of the brick/flight control board to see where the antenna was as I could not see anything looking into the fuse . Armed with some intel I proceeded to use a control rod to coax the antenna into a better position . ( Pictured )

Previous to this the antenna was perfectly aligned with the flight control board sticking out into the back of the fuse . So at the right angles I was getting signal degradation .
Maybe the brick / motor / battery / wing etc were able to block the antenna because it was sticking perfectly straight out the back of the flight control board ? Anyways , I have ever so slightly re positioned the antenna for the next flight . So hopefully no more signal degradation !
Posted by old4570 | Jan 07, 2021 @ 07:10 PM | 3,399 Views
UMX Turbo Timber Maiden (5 min 42 sec)


First let me thank the Universe for a really nice morning , everything was excellent , except for the humidity .


UMX Turbo Timber .

Everything was as per ( As it came out of the box )

OMPHobby 300mAh 2s Battery
Flying weight 122 grams
CG was 28mm
Flaps = Yes , entire flight was 1st position or Take off flaps
Stability mode = Yes , for the entire flight
Timer set for 4 minutes , I flew for 4.20 and when I got home had 50% battery
First flight was Low & Slow .... As slow as I could go ! Any slower and the TT would land ( Actually it did ) . I literally pushed slow hard !
I wanted to check for stall and battery consumption as well slow speed flight characteristics .

Flying the UMX TT @ 122 grams

It literally flew out of the box . I did nothing except set up basic functions . I dont even know if I need expo . It was just crazy stable with stability on and there was no stall characteristic of any kind with stability on . I flew so slow , backed of the power so much that the TT just landed . This was a very tentative first flight , maybe because this is for me a bit of a expensive plane .
With take off flaps and stability
If you live in the USA and dont have one of these ? I would have to ask why not ? Why dont you own a UMX TT ?
In other countries where a prop might cost you 10 to 20 bananas , I can understand reluctance .
Butt , and it's a huge but ! (...Continue Reading
Posted by old4570 | Jan 05, 2021 @ 09:53 PM | 28,604 Views
Umx Turbo Timber bound and set up (2 min 9 sec)


It lives ...

Battery will be a 300mAh from OMPHobby T720 ..
Flying weight looks to be around 122 grams
Battery will make CG
Ailerons have - 50% / 75% / 100% rates
Elevator / Rudder have 100%
Expo is 40% for now . This may need to change .
Motor / Prop pulls 6 amps ... ( Will need to explore propeller options )

BIND ( To Taranis Qx7 with multi protocol module )

Tx = DSMx-22

I turned on the Tx and got it ready to bind .
Turned on the UMX TT
Once the TT had beeped and thrown the control surfaces around some and STOPED !
I then activated the bind in the Tx ..
5 Seconds or so later the Tx was bound to the TT ..

CH5 is for flying modes ( Stability or not ) = You may need to reverse the Ch to get the mode you want for switch position
CH6 is for the Flaps - I slowed mine down 0.5 seconds up and down .
I did need to reverse my rudder ..

And here we are ! TT is back in the box and Tx is set up , battery is charged . Just need for the weather to co operate - Which might be next week ?
We are having a bit of a wintery summer so far ..
Cool / wet and windy !
I dont mind the cool , I dont mind the wet , but the wind can take a hike !
Posted by old4570 | Jan 05, 2021 @ 08:45 PM | 28,568 Views
Whats to worry about ?

Well , whats to worry about is reverse polarity ...
The UMX Whipit - the batteries are reverse polarity when compared to other batteries used in drones ..
Look the same / same size / capacity etc .. Only the whip has reverse +- .. ( So you cant use cheap generic batteries perhaps ? )
This in my opinion is dirty pool !

Why reverse the battery plug except to shaft the end user ?

So next I have to plug in a 2s battery and see what happens !

It is a little worrisome !
Posted by old4570 | Jan 05, 2021 @ 07:55 PM | 28,663 Views
Ooooh ! Stupid proprietary battery plug ! Seriously ?
What is this , the dark ages ?

And of course the wires are crazy short , making re plugging a PITA !
Seriously Horizon , way to push buyers remorse !
I mean , 2020 / 2021 and who wants to make life easy ?

That 3 bladed prop is crazy expensive . - Going to have to find a SANE ($) replacement ASAP !
Who the hell wants to pay $20 to $40 Aus for a plastic prop that costs maybe 10c to manufacture .
The more I find , less there is to like !
This plane might be ok in the USA , but here in Oz it just seems like a RIP in the wallet !
I am keeping the box , I might sell this in the near future .
Posted by old4570 | Jan 04, 2021 @ 09:55 PM | 3,298 Views
That is a really small motor in the UMX TT
Question ? Spinner/nose cone - How do you remove it ? ( Is it glued in place ? ) Do you need to damage it to remove it ?
My UMX TT looks to just come in a hairs breath under 105 grams out of the box .
C of G is supposed to be 28mm , which looks to be just behind the carbon spar . ( On the underside of the wing )
I have some 300mAh 2s batteries and the TT looks like it uses the balance plug for juice .

Oh dear! Looks like the foam spinner is glued . I did want to bench the prop and compare it to some 2 blade's .
Usually 2 blade props outperform 3 blade props , at least in this size .

And I did want to remove the prop as some binds have a throttle issue ( needs channel reversing ) .
I dont want to FUBAR the foam spinner !

How do I feel opening the box ?
So far seems ok , the wires at the tips ( nav lights ) , yeah = Could have been done better !
Do I have to bore a hole thru the spinner to remove the prop ?
In Australia = Very Expensive ! But this is my Last Years Birthday Present ! ( But still expensive ) I really did want one ( expensive ) .
Can I get past the Cost ? Will have to wait and see on that one ....Continue Reading
Posted by old4570 | Jan 03, 2021 @ 04:53 PM | 4,747 Views
Something came in the mail .

Now at first , the plain brown box ! Was so big I thought some one had ordered an air-conditioner or something .

It was only when I saw the Hobby trade logo on the box I realized it was the UMX Turbo T

That's when I remembered that the Turbo T comes fully assembled .

It be wet and windy right now with a weather prediction of more wet and windy in the days to come !

Might have to download the user manual and do some reading !
Posted by old4570 | Dec 31, 2020 @ 07:00 PM | 7,581 Views
7 30am Jan1 2021 OMP S720 (5 min 41 sec)



Brutal steamy / humid / fly infested Jan1 2021 morning .

But I did get to RC ... ( Thats got to be nice )

Unfortunately , some people left their fireworks rubbish behind ...

Is it that hard to walk 10 meters and throw your trash in the rubbish bins ? ( Obviously it is ! )
Posted by old4570 | Dec 30, 2020 @ 08:26 PM | 7,015 Views
It's New Years Ever here in Oz , Tomorrow is 2021 for us Down Under !
So wishing planet Earth a much safer - happier - healthier - etc , year in 2021 .
2020 was certainly a year most would like to put behind them .

I purchased the UMX Turbo Timber as it was finally in stock here in Oz . Probably get it some time 2021
This is the micro plane I have wanted for some time ( always out of stock ) .

Only one thing on my to buy list , one of those Multi protocol transmitters ( as opposed to modules ) .
Maybe for my Birthday ?
Posted by old4570 | Dec 29, 2020 @ 09:41 PM | 8,328 Views
Hmmm ,

Ok , mine flies real nice except for one thing ..
it climbs / lifts it's nose under power .. The more power , the more it lifts the nose .

I am already flying with visible down elevator which is fine to about 50% throttle and after that it climbs under power .

The cure ? More motor down thrust maybe .

So with all the wind outside it's time to do some hanger stuff !

Cowl came off , I unscrewed the motor and flipped it 180deg .. Looks like , more down thrust ! Or is it an optical illusion ?

Oh well , I will find out next time I fly it .

My little brushed project is ready for control horns ...
Should be flying 2021
Posted by old4570 | Dec 25, 2020 @ 09:36 PM | 9,285 Views
Micro Tundra gets a new flap servo (3 min 58 sec)


It's in and looks to be working ok .
Posted by old4570 | Dec 25, 2020 @ 07:22 PM | 8,943 Views
I ordered 2 OMPHobby servos for the S720 / T720 , because they look the closest to the MT servos .
+ Hobby King does not sell spares for the MT , so ?

Check out that failed servo ! What Bee Hive @ Durafly decided to put a faulty / damaged servo in my MT ? I sure as hell didn't melt it .
Thats a melted servo . ( The way it came - I noticed during assembly that it looked a little NQR )
It worked for a while but then died ! ( Thats a flap servo )

Some one decided to make changing servos a real PITA ! I ordered two servos cos I thought I may need to change both ( resolution and all that ) , but it looks like the servos might be same-o same-o .

What a PITA !
Looks like I will need to do some soldering !

Not happy Jan ( or in this case Durafly )