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Archive for August, 2014
Posted by kiwi_craig | Aug 25, 2014 @ 04:20 AM | 6,471 Views

update from Matelec with his parts install

Hi Craig
Had a little spare time today in between jobs.
Here is a couple of pix of head ready to fit you can see the offset of the pin on the swash plate & all fitted up including new servo with extended limits.
Original Elev servo locked up solid and wouldn't move when I was having a fly before changing the head over.
Now have full movement without any binding, just waiting on wind to drop. Looks very impressive and smooth movement.
Fitted a shim top and bottom on rotor blade pivot points as there seemed to be to much slop there.

and his initial flights - results:

Flew for about 5 min before dark and first impressions are I have control like never before.
Posted by kiwi_craig | Aug 20, 2014 @ 05:33 AM | 8,894 Views
Ditched the MJX motor gutless wonder........

Fitted up an EH200 4100kv from hobby king, big improvement. Allot more throttle response and faster head speed as well good 10 plus % gain

Mjx was pulling a rotor speed of 2420rpm full throttle, EH200 was pulling 2710 initially then as the batt ran back dropped back to 2640 for extended duration.

Runs allot smoother as well as nice response on the throttle. MJX motor was pretty flat after 1/2 throttle

The motor is 2mm smaller in dia the mjx was rubbing the servo arms which wasn't helping the handling at times....

Test flights this weekend, bottomline EH 200 is a way nicer motor........
Posted by kiwi_craig | Aug 15, 2014 @ 04:54 PM | 6,199 Views

Parts in, the workmanship is superb

More pictures to follow once opened / unpacked
Posted by kiwi_craig | Aug 04, 2014 @ 05:30 AM | 6,659 Views

good news, Turnigy TGY-50090M servo arms are a PERFECT fit on the V915 servos, these have a larger arm mounting hub than the V912 servo.

and for the V912 crew, the V915 PCB has 50% MORE travel on the servo channels.

Measured 7mm with the Turnigy TGY-50090M long arms, V912 PCB, Tx H setting with the turbo switch mod - on.

Same remote control, V915 PCB, Tx H setting, Turbo switch on, 11.5mm ! this backs up my visual assessment that the V912 servos have the swash close to maximum angular travel with the Tx on H + turbo mod ON.

Final item, after some comparative C of G calcs sorted, another 12 grams of nose weight is being added to counter the reduce weight of the brushless main motor, 38g vs 58 grms - F45 main with heat sink. Placing the weight forward provides more lever arm effect so less total weight needed.
Posted by kiwi_craig | Aug 02, 2014 @ 05:34 AM | 7,536 Views
Work in progress

MJX F45 brushless ESC. FF200 5000kv main. 9t pinion.

All going great guns for the planned install right up to the point that i found the BG 2.3mm pinion is in fact only a 2mm drilling......

ESC weights in at 10.5 grams. FF motor comes in at 25 grams EH motor is slightly heavier at 27 grams. MJX motor comes in at 38 grams, allot heavier motor can. Stock 370 brushed mains are in the 55 - 58 gram weight range.

Plenty of motor choices out there

Helipal HB2624 5000kv motor

Hobbyking has the FF 200 and EH200

You will need to source 2.5mm dia .45mm pitch metric mount screw for these.

Banggood has the 4800 mjx upgrade motor and the std mjx brushless kit with the 3900 motor it has a 26mm dia can.

MJX Factory Kits: the mjx kits come with a 3900kv motor which is about the same performance as the F45 brushed motor. Which makes sense when you think about it...... I run the mjx kit in my v915 works nice but lack top end punch. Some vendors offer an uprated 4500 or 4800 kv motor option

The higher Kv4800 -5000 kv motors need the smaller pinion to allow the motors to rev accordingly. I haven't been able to find a 2.3 mm 8 t pinion yet, i would like to try that with the 5000 kv motor. 3900 - 4200; 10 T 4800 - 5000; 9t and for light weight birds maybe the 5000kv might get away with an 8t.

Banggood has press on 9t and 10t pinions in stock. WARNING - the 9T is a 2mm dia....... so NBG (No Bloody Good) they do have 2.3mm but they cant tell you which is which it would seem............

Hobbyking can do the 8t pinion

Xtreme also has a range of pinions

Bare MJX esc boards, topstoys do have these, pay to check they actually have stock.......