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September 24, 2017, 18:47:23 PM

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Author Topic: WOT4 Mk2 ..... E-powered ....  (Read 574 times)

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Offline solentlife

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WOT4 Mk2 ..... E-powered ....
« on: August 28, 2017, 19:48:23 PM »
Recent return visit to UK to see Son on his B/day ... I dropped into shop and picked up a WOT4 Mk2 IC / EP ARF ....

I used to have WOT4 back in 80's and had a piped ST60 up front ... amazing machine.

So I found myself daydreaming of those long ago days and decided to break open the wallet and relive them ! BUT with E-power this time.

OK ....

4250 650kv .... 5S 3000 ..... 50A ESC .... 13x8 prop with alloy spinner

4 standard servos

The elevator and rudder servos will be fitted to rear of fuselage to shorten control rod span and give direct control.

No added ballast as the servos in rear compensate for the bigger motor up front.

AUW ready to fly with the 5S in .... 2.22kg ...... which is less than I expected ....

Photos later once all completed.

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC


Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #1 on: August 28, 2017, 19:55:11 PM »
I also amended the tailwheel set-up to Chris Foss original where he used a rubber band as shock absorber link ... just means bend the stock wire close to the plastic mount horizontal to bottom of rudder ... bend a hook and cut of excess. Then embed a U wire into rudder to take the band ...

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC

Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #2 on: August 30, 2017, 10:50:25 AM »
Wife did the honours !



General view :



Modification to balance bigger motor / battery pack by moving servos to rear and direct link :



Chris's original tailwheel steering idea from the 80's ... instead of the wire rod into the rudder hinge line. This allows shock absorbing and reduces risk of rudder failure :



CoG spot on



Turnigy Propdrive 4250 650kv, 50A ESC, 13x8E prop
LiPo is set up for single 5S 3000mAh ... but its a very tight squeeze to get it in ... so I picked a compromise prop in the 13x8 that allows me to parallel twin 4S 1600 packs.

Note she also has extended servo arms all round - once trimmed / sorted - means I can dial her up for extreme antics.

Just waiting for weather now !

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC


Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #3 on: August 30, 2017, 18:56:26 PM »
Thrust tests :

On the 5S - ESC is about on its limits .... so may swap out for larger.

52A WOT and 900W

But static thrust is a whopping great 3.5kg .... for a 2.2kg AUW ...

Next is the twin 4S ...

38A WOT and 530W

Static thrust 2.35kg .... so still enough to be interesting !

just gave it a 5 min flight .... evening and wind died just enough to get her across the road for a quickie ...

PERFECT ! 5S and 4250 dragged her up there and she flew a dream ! Verticals were nearly as good as my original WOT4 back in the 80's with piped 60 up front !
CoG was spot on as per book ... rolls and loops straight and nice .........

Flew a full 5mins as calculated .... LiPo came down at 42% ..... so that gives me between 6 and 7 mins with a lot of low throttle work ... 5 mins with spirited.

Stupid me - I fired up my headcam - but forgot to start it recording !

Only niggle - Why can't any factory get cowl blocks right so screws don't pull out or blocks split ! I just have to fix the top cowl screw block ...

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC

Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #4 on: September 01, 2017, 20:01:27 PM »
Here's flight with 3S packs .... I made mistake - should have been 4S ... but in the rush to power up - picked up wrong ones !

<a href="http://www.youtube.com/watch?v=wxA1eLeApEg" target="_blank">http://www.youtube.com/watch?v=wxA1eLeApEg</a>

Then on 4S as it should have been !

<a href="http://www.youtube.com/watch?v=A7GtWFCnAYk" target="_blank">http://www.youtube.com/watch?v=A7GtWFCnAYk</a>

But the ultimate of course was with 5S .....

<a href="http://www.youtube.com/watch?v=sCF8if-MlCs" target="_blank">http://www.youtube.com/watch?v=sCF8if-MlCs</a>

Am I happy ? You bet !

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC


Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #5 on: September 03, 2017, 17:34:21 PM »
The servo extenders I had on Rudder and Elevator arms have now been removed, standard arms with same stroke length of horn / arms now .... Tx DR full rate increased to compensate and regain resolution.

Wheels - Sullivan Skylite 3" have been fitted to replace the smaller stock wheels, that should help with the nose overs on grass.

Just waiting for weather to improve so I can go fly her again.

I had plain forgot how good the WOT4 is ... now its making me hanker after the AcroWot - to replace my Zlin Z50 I crashed.

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC

Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #6 on: September 04, 2017, 17:46:08 PM »
Electric fired smoke being added now ....

Canister to each UC leg ... the trigger is powered and controlled via the Rx ...

Flick Gear switch on Tx and #1 smoke ignites ..... flick gear switch again and #2 smoke ignites .... the trigger being sequenced.

The canisters require a short length of fuse in a small ring round the detonator, a plastic card piece taped over to hold against the solid fuel till it ignites.

Hopefully once weather clears - I shall be able to test and video ...

Nigel
« Last Edit: September 04, 2017, 17:47:58 PM by solentlife »
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC

Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #7 on: September 07, 2017, 19:21:47 PM »
What can you say ... its a WOT4 !

<a href="http://www.youtube.com/watch?v=dvgdNn036sQ" target="_blank">http://www.youtube.com/watch?v=dvgdNn036sQ</a>

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC

Offline Pidge

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #8 on: September 08, 2017, 22:44:15 PM »
Nigel.
It looks like it flys very well.
I've looked at the AcroWot but I think I'm more of an IC guy
Plus enough to do.....


Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #9 on: September 11, 2017, 11:24:20 AM »
Very Very happy with it ... the 4250 with 5S is overpowered - but gives her an edge that delivers ...

I did consider fitting my spare ASP 61 .... but then went for simplicity of E-Power ...

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC

Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #10 on: September 11, 2017, 18:37:30 PM »
<a href="http://www.youtube.com/watch?v=SOOWrVyh9w8" target="_blank">http://www.youtube.com/watch?v=SOOWrVyh9w8</a>

<a href="http://www.youtube.com/watch?v=Dl5loSAofrI" target="_blank">http://www.youtube.com/watch?v=Dl5loSAofrI</a>

Nigel
« Last Edit: September 11, 2017, 18:42:34 PM by solentlife »
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC

Offline solentlife

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Re: WOT4 Mk2 ..... E-powered ....
« Reply #11 on: September 17, 2017, 16:05:55 PM »
<a href="http://www.youtube.com/watch?v=VLs3XAGGao4" target="_blank">http://www.youtube.com/watch?v=VLs3XAGGao4</a>

Boy am I glad I finally built another one after all these years !!

Nigel
450se V2, Syma S006, ME109, 3D Aerobatic-wood, Extra, Pitts, Concorde. Tu144 etc... 9X, 9XR, JR Propo 8ch, Radiolink 6ch .... If you don't crash - you ain't flying !
Old hand returned to RC


 

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