kiwi_craig's blog - RC Groups
kiwi_craig's blog View Details
Posted by kiwi_craig | Dec 07, 2017 @ 04:40 AM | 1,141 Views
Gartt 450L canopy, $12.99 delivered from banggood, really solid, nice paint finish, blippin bargain...... Has a nice almost wrap around ala goblin look.

https://m.banggood.com/GARTT-GT450L-...l?rmmds=search

Has a slot opening on the underside perfect for air flow up over the esc unit and to get airflow up over the motor as well.

Bargain !
Posted by kiwi_craig | Nov 06, 2017 @ 11:39 PM | 1,733 Views
As some will know there was a range of "issues" with the 2 in 1 esc on the blade 200 SRX tail motors, from my delving into this I have generally found the issue was more related to the wiring plugs, especially the slim line plugs in the tail rear section and people fitting the tail blade on backwards = instant motor over heat..

Others have added a standalone esc which I have done with success but have looked to go one step further and go dual stand alone esc's on brushless heli etc for ultimate tenability especially once the gutless main motor is ditched for some more respectable power wise ! 0n both the 200 SRX and the 230 S.

Builds in progress are:

Conversion of Blade 200srx with single 2 in 1 esc to initially a separate tail esc and then two aftermarket esc’s with replacement higher spec main motor (performance build).

Conversion of the blade 230 S to two aftermarket ESC’s with upgrade higher spec main motor.

200 SRX tail upgrades
Initial findings on my two blade 200 SRX’s – additional tail ESC, both are running three bladed heads, one with a stock main motor, the second with an up spec 210 watt - 4100kv motor (hobbyking EH200).

I have trialled two ESC units on the tails, DYS SN10A and DYS SN20A.

The 10 amp ESC is marginal and has resulted in motor overheating at times and are not recommended.
The 20 amp esc is performing fine and appears to be well suited to this application.

Next stage is to change the main esc out...Continue Reading
Posted by kiwi_craig | Oct 06, 2017 @ 04:37 AM | 1,563 Views
Been really keen to hop this up onto 3s power but the stock props develop a hell oscillation due to the blade profile. When Banggod came out with the 7045 3 bladers i knew this could be something, the 6045 3 bladers where nice and smooth but just not big enough

Ordered up two sets, red and white. The props are marked A and B and the tthreaded prop nuts seem decent and the included grip tool works fine. Clearance is okay to the shell resonably close in the front, miles in the rear.

Fit and balance is really good. Threads on on the prop nuts are good, nuts are marked for left hand and right hand. Seems like an excellent product.

Hover time is around 8 minutes + on 2s. On 3s its as smooth as, no more oscillations and death wooble on spool up, YAY ! Finally a prop that works and has decent flight time. Motors remain cool.

Test fly this weekend but intial indoor testing it seems damn nice.

https://www.banggood.com/4-Pcs-Prope...474558201403EJ
Posted by kiwi_craig | Sep 30, 2017 @ 02:57 AM | 1,896 Views
V950 Hughes 300c part 3

Rotor head update. Swapped out the stock plastic v950 blades for 2 sets of trex 250 fibreglass units . Online reviews warned that they can vary in weight between matched pairs so to get three matched was a chore - a fair amount of tape on one, but otherwise they balanced out nicely overall. Secondly they are thinner at around 3mm, added blade 450 plastic rotor shims on the bottom then selected thin steel gearbox shims over the top. Bit of effort getting the tracking spot on. They look great and the stiffer section adds crispness to collective and cyclic response. And they are dirt cheap from hobbyking and if you have the patience required to balance and shim them they do provide a nice setup.

Another rotor blade worth investigation is the new lynx Oxy 2 blades , lynx quality and a sharp price.

Replaced the failed stock tail motor with a Walkera Master CP unit, cheaper than the WL part and has the pinion gear already fitted which also matched the 950 setup.

added blue tinted acetate "doors" goes nicely with the yellow canopy.

Overall it is flying really nicely and I can see it being a fun park flier from here on in

V950 - Hughes 300C scale build with triblade rotor head (5 min 6 sec)

Posted by kiwi_craig | Sep 17, 2017 @ 04:00 AM | 1,647 Views
Landing Gear Update

Got the alloy landing gear on, looks great. One thing to watch, you need to feed the battery through from the very rear now ; the rear alloy frame means you can't get it into place from the bottom !

top flying struts to the semi scale tail boom done, the lower struts to come (out off suitable ends) and to find some more scale like rear fins.

overall I think its looking pretty good !
Posted by kiwi_craig | Sep 16, 2017 @ 03:55 AM | 1,958 Views
The triblade is getting a new scale body - Schweizer 300c. Based on some old syma canopies, thanks Murray! the fit up was quite straight forward. Allot of trial fits to decide on the drilling points for the lower front canopy pins.

After allot of trying it just wasnt possible to get the canopy to overlap the rear canopy pins and remain with the battery tray tucked into the lower canopy edge. Hot glued on some plastic hex standoffs to tie into the canopys rear mounts, these are needed as the rear section "fuel drum" vibrate badly if not secured.

See my blog for details of the triblade conversion.

Intial test hovers, all good.

Next stage is to add an alloy landing gear setup and some additional rear stays for a better scale appearance and the boom tube covering and correct tail fin.

The yellow is growing on me and I know it will be easy to see flying....Continue Reading
Posted by kiwi_craig | Sep 02, 2017 @ 02:44 AM | 1,881 Views
Upgraded main motor and tail blade, now ditching the blade 2in1 esc unit. Test unit for my UH-1 Huey build, turnigy 18a plush main esc and dys xm10a unit for the tail. Bench test all plug n play, dead easy. Plush is exactly that, plush with its nice smooth start and 2A bec to power everything. Dys is flashed with blheli so we can tune that in to !

Now to clean it all up, and detail it out , test fly it and fine tune the esc units then fit up into the huey shell.

Now to do the same on my powered up 200srx tri blade with hi po main motor.... A soft smooth start will be great on that as well.
Posted by kiwi_craig | Aug 08, 2017 @ 05:13 AM | 2,546 Views
okay so we know the V950 has a lag in the pitch curve and tends to be jumpy right at the hover point, I've tracked the pitch vs throttle settings and compared to the MCP head which flies allot nicer. This is for the linear throttle , minimal negative hover at mid point setting.

with the Devo 10 / Deviation software CH( which is a trim for the pitch a correction can be developed to further smooth the curve.
Posted by kiwi_craig | Jun 09, 2017 @ 05:44 AM | 5,572 Views
After the less than stellar experince with the BG blue alloy shocks - i decided to return to the CPV quality shocks, this time around i went for the remote reservoir rear shocks, they come with three pairs of springs for fine tuning.

http://www.hobbyease.com/titanium-al...pcs-p3032.html

Fit up was straight forward, the lower bush was a fraction wide, i had some hps 5.7mm ball ends that fitted straight in, job done. Went with 900cst silicone oil, tad heavy i think.

not as large as the HobbyKing Vandal alloy shock (they are huge) as per my other FY03, decided to go 10mm shorter - 85mm, shock has the same shaft travel due to the remote reservior, ride height is nicely lowered.

The heaviest springs are definitely firm enough based on the calibrated finger squeeze test !

Looking forward to testing this !
Posted by kiwi_craig | May 21, 2017 @ 02:48 AM | 5,445 Views
sick of the screaming tail blade on the 230s when flown with gusto - here's a solution !

the new generation of micro brushless quads are also bringing allot of options with smaller 2, 3 and 4 " diameter blades. Eyeing up the data I settled on the DYS bull nose 3045 tri blades. These are made from a durable and flexy material. diameter is smaller than the blades tail rotor = 82mm vs 75mm for the DYS, the dys has a fraction more pitch from the eyeball micrometer.

allot of the smaller quad blades use a 5mm bore so a blade spacer is needed, by chance GWS make exactly what is needed.

the stock setup relies on a key - flat edge to lock the prop for drive. the quads rely on sandwiching the blade between washer on the prop drive snout. Pretty easy to add 2 washers and a spacer tube to make up the diameter difference between the blades small dia prop shaft and the quads 5mm size. tighten down between two washers and your good t0 go.

hand testing and running the tail motor at full throttle for 30 seconds and then 1 minute did not induce over heating, there is more thrust than the stock blade thats for sure.

price is like $1.50 for a pair, okay your only going to use one of them but at that price who cares............. miles more durable and improved thrust at full throttle.

pretty funky translucent colours

https://www.banggood.com/1-Pair-DYS-...l?rmmds=search

needs a back washer , thin prop centre spacer (gws 5mm units where close to spot on) and a larger front washer.

Miles more durable and looks neat to boot.
Posted by kiwi_craig | May 20, 2017 @ 03:14 AM | 5,952 Views
The 230s is a nice flier and a great trainer but lets face it, its no power house, the little 3900Kv Motor has been dumped in the new 200s for a more powerful unit and blade went with the 300x / cfx motor in the 250cfx, which shares the same rotor head as the 230s.

My 230 is destined for a huey scale shell but i wanted a boost in power so it can fly with decent authority with the weight gain. The 230 s chassis is pretty restricive space wise and whilst the blade 320 motor out of the 300x/cfx/250cfx is an option its quite tall and would likely stick out the bottom of the chassis and i'm betting is going to be allot harder on batteries.

By chance i have two FZW 2625 3900kv motors that where originally offered in the MJX F45 brushless kits. These motors run sweetly on 3s and provide good performance. Ive had one runnng in a v950 and it was preety decent power wise. Only odd detail on these motors is the 2.5mm shaft size, so drilling the blades pinion and or an aftermarket 12t 2.3mm pinions is required and is easy enough.

Eyeballing it, it all looked spot on fit wise so into it!

I hade to use a flat file to nudge the openings a fraction on the blades motor plate, reused the orginal motor mount screws.

Decided to drill an aftermarket 12t pinion, longer overall than the blades unit.

Due to the increased motor can height the esc is now run under the chassis like on the 200srx, this actually makes it allot easier to see the low voltage led on the...Continue Reading
Posted by kiwi_craig | Apr 08, 2017 @ 09:04 PM | 6,253 Views
The weather has been rubbish with allot of wind, decide to take the V950 down the park and get a short outdoor flight in.

Meet all expectations, flies very smoothly and has good cyclic and collective authority , and has a decent turn of speed when cranking on the throttle.

Stock motor handles the tripple blade head without worry and easy 8 minute fly times +

brushless tail is the next project then this gets loaded in an AS355 body shell as a sport flier.


V950 tri blade (3 min 30 sec)

Posted by kiwi_craig | Apr 08, 2017 @ 08:07 PM | 6,281 Views
Final Assembly

three different canopies, Rakon angry Bird for the 200 SRX is a perfect fit. FX067 canopy, I use this on my master CP, long nose, also suitable. and the stocker.

Using Blue Arrow servos, very smooth and precise.

Flies beautifully on the Walkera 4f200 LM blades, tracking is "perfect".
Posted by kiwi_craig | Apr 08, 2017 @ 07:50 PM | 6,420 Views
The New WL V950 is lovely based on the Walkera Master CP. The entire MCP drive line can be fitted into the V950 ring superior head response. A step further the 4F200 and 4F200LM three bladed rotor head and drive line can be setup into these units. the V950 main motor has no problems driving the three bladed head, the heli flies very smooth, this setup is destined for an AS355 shell as a sport flier.

Walkera Models:
4F200 is the pod n boom 3 blade heli
4F200LM is the scale heli 3 blade Lama

Parts list

Driveshaft; the original 4F200 shaft is longer than the LM version and is preferred. you will need to redrill the lower hole positions to suit the MCP main gear, this is the only part that needs major modification.

Driveshaft collar: I used the extreme clamp for the blade 200 SRX, this clamps around the shaft so no need to worry about notch heights or drill holes.

Main Gear; the master CP unit is preferred as it then get the rotor head up around the same height as stock.
Swash; 4F200

Swash locker unit: either the 4F200 or the LM version, normally comes complete with the driveshaft

Rotor Head Assembly; 4F200 LM unit (black and silver) or the 4f200 (red) is suitable. Get the main blades to match.

Linkages; The 4f200 uses a smaller 3mm ball size, you will need to get two sets of either the 4F200 or 4F200 LM links, you will need to use the longer steel shafts for both upper (swash to blade grips) and lower (swash to servo)

3mm ball ends: Rakon sell...Continue Reading
Posted by kiwi_craig | Apr 08, 2017 @ 02:33 AM | 6,344 Views
Blade 200 SRX with microheli 3 bladed head. Altered the pitch setting on the blade grips using a spacer like the rakon setup to set the clearance and the blade grip angle and used the stock 175mm long FP blades rather than the shorter 150mm CP blades.

Using the stock 11t pinion, motor has no problems spinning three blades, just goes to show how under geared they are stock.

this one is destined for a seahawk sport flier scale canopy. Bird no 2 with the Rakon setup and repowered with a higher Kv motor is the rip snort sportster. See the short blade Rakon flying here: https://www.rcgroups.com/forums/show...0-SRX-repower-!

Flies really nicely with the "big rotor" head setup. Liking the Lionheli Parrot canopy as well, looks great. You can hear the wind at times in the video, it handles the wind far better than the stock 2 bladed version which is quite interesting.

Blade 200 SRX microheli tri blade "stretch" (3 min 5 sec)

Posted by kiwi_craig | Apr 05, 2017 @ 02:46 AM | 6,460 Views
Repower time, my stock motor has eaten another set of bearings and for some reason the magnet can is a fraction crooked ! The gap at the base opens and closes, combined equals a bad vibration, which these helis hate.....

Tested a 4100kv hobbyking motor, smaller diameter but taller can, with inbuilt cooling fan head. Has allot more power and faster response, max power rotor speed is impressive, and it runs smooth..... No more stupid priced HH motors.... the cooling fan really helps.

https://hobbyking.com/en_us/eh200-br...er-4100kv.html

the stock and aftermarket stepped bore pinions go straight on, the motor has the same step arrangement right at the base.

This motor has already done allot of flying in another one of my helis, was a strong performer.

Mounting screw spacing is narrower so had to add cutouts into the alloy mount and then elongate the slots in the chassis side plate, i run a 14t lynx steel pinion.

Flight testing on the Rakon tribade head, my god does this thing haul ! pulling just over 4,250 rpm head speed and insane performance ! running the DX8 with 115% scaler on servo travel also helps the agility ! WAY TO GO.

Blade 200 RKH - EH200 power (4 min 5 sec)

Posted by kiwi_craig | Apr 04, 2017 @ 04:26 AM | 7,194 Views
okay, my two SRX 200 triblades.

bird one Rakon head, with EH200 4100 kv motor, 13t opps 14T ! pinion, rocket ship to fly

Maximum head speed, a stonking 4256 RPM !!! static thrust test 700 grams, flying weight 290 grams, thats decent thrust to weight = 2.14 times ! 150mm blades.

bird two. Microheli head with modified stock 6 degree main blades and repitched 175mm blades. stock motor stock 11t pinion (tried a 13t but the rotor is just to loaded with the 3 blades) feels smooth and fast.

Maximum head speed 3074 rpm. static thrust, hit 900 grams then pulled back to 800 grams constant !!!~ 2.71 thrust to weight !!!

currently the pitch is still a bit steep and more adjustments needed should see the rpm go up. The stock motor has good torque and thrives in the higher loads, where as the EH200 is a revver and loves the shorter blades on the stock rakon setup.......

both fly superb, not going back to a stocker now.........


with the stock drive line and 8 degree xtreme blades we saw around 3600 rpm, jumping to a 13T we saw 3800 rpm and a big improvement in how it flew. 14 T was better but the rpm gain tampered off, maybe 3875. For fp birds they seem best in the 70 to 80 efficency range, above 80 means your under geared and below 70 your over geared. no thrust test though.

See spreadsheet data below. efficiency = max thrusted loaded rpm / unload rpm (based on Kv by volts - found this to be pretty close)

The tri blades stonk! two different builds, two different machines, I like BOTH !
Posted by kiwi_craig | Mar 13, 2017 @ 10:31 PM | 7,511 Views
FY 02/03/05 etc fans

New out on aliexpress, full alloy HD differential units, these look superb, ring gear and spider housing is all one piece with bolt on end caps

under hard abuse the plastic diff housing can stretch and the spider gears can slip damaging the teeth

just need banggood to get stock and a sharper pricing and happiness filled!

https://www.aliexpress.com/item/Feiy...9-27c4bee71213

https://www.aliexpress.com/item/Feiy...9-27c4bee71213

https://www.aliexpress.com/item/Feiy...8-f5c7b31d8326

https://www.aliexpress.com/item/Feiy...8-f5c7b31d8326

a decent splined driveshaft, personally don't like the sliding pin drives as they wear like crazy............

https://www.aliexpress.com/item/Feiy...9-27c4bee71213


and new adjustable steering rods, finally !

https://www.aliexpress.com/item/Feiy...7-9a0cd5f82eec

now to get my hands on some !
Posted by kiwi_craig | Mar 10, 2017 @ 12:18 AM | 7,620 Views
well after numerous late nights, head scratching and related, I have found a cure.......

the 150mm blades included in these kits are simply to short.................

I altered the pitch setting by sliding the swash locker up the drive shaft, this reduces the pitch, and trimmed the blade roots on the stock 185mm FP blades and fitted these up, and damn it, it flies as docile as.................... no death wobble, zippo, hovers happy as, STUNNED !

The tails working, just humming, with all the extra torque off the head, but no more death wooble...... I can see a longer tail tube to balance the head torque.

So the real problem is the stupidly short bloody blades they fit on these things. !!!!! waste of space.......

There is a still an odd response to the servos due to the fraction off phasing, but at least its well flyable......... I can work with this !!!

Translating this back to the stocker id bet serious $$$ if some one made a set of blades say 10mm longer than the stocker it would make a tremendous difference to the birds stability in stock 2 bladed form.....

Bloody helll..... What a journey this has been..... And i ordered a rakon head yesterday in frustration, arh well. Twin tri blades ....

This is my take on the situation: for the 200 the rx is tuned to suit the response from the stock rotor diameter, at around 400mm, The tri blades, they reduce this to 350mm and put in more pitch...... The rx senses an out of sync aileron roll and puts out...Continue Reading
Posted by kiwi_craig | Feb 10, 2017 @ 05:39 PM | 7,687 Views
Lots of choices out there, its really important to get the motor KV / battery / gearing all matched.

there seems to be allot of high Kv "kits" that basically cog like hell and are rubbish to drive,

here is my spreadsheet figuring kv. batteries and gearing compared to the stock setup running a 2S lipo as the base line 100% value.

basically around 30% speed increase is the practical limit - gain

I went to the effort of hunting out the 2845 - 2600kv motor, it works nicely, excellent torque and stellar top end speed on 3S.

2S - the 3100 motor is the pick, 3S the 2600 or 2800 motors are the go.

gears the robinson racing gear sets are the way to go 16t through to 26t works on these setups.

get the bigger 2845 can motors, forget the smaller 2838 motors, gutless in comparison. and anything higher than 3600kv just wont work worth a damn.......