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Old 08-25-2017, 12:44 PM   #1
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Default WOT4 from UK ......

This is an iconic model that has been available from mid 1980's and STILL sells well in UK .... I brought the MK2 back from my latest trip to UK and am putting her together ....

http://www.ripmax.com/Item.aspx?ItemID=A-CF020A



I had two of these before .... both had ST60 with tuned pipe ..... could rise vertically out of hand. Performance is just truly amazing for a high winger. This is down to the fat semi symet wing it has.

I have available two power systems that will give similar to my 1980's setup :

So I have a choice .....

ASP61 glow

or

4250 650kv + 4S / 5S LiPo

Interesting that weights come out similar around the 780gr for both systems ....

Thats a lot of weight up front and I am thinking to move servos to the rear of fuselage to balance out instead of the factory position below the wing. This will give direct surface connection ... no need for corrective weight to balance power system ...

Looks like I will be fitting the ASP 61 .... similar to my WOT4's of the 1980's I had ... with ST60 ...

I know this is Wattflyer ... but thought it might be interesting for some ...

I did think about the E system - but it needs extra mount boxes and battery trays etc. that all add up in weight.
The ASP is basically a bolt on and fuel tank slides into place.

Nigel

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Old 08-25-2017, 05:45 PM   #2
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Have fun Nigel, I will not put down anyone for their choice of power.

I too have many nitroplanes from my early years in RC.

As long as a person is enjoying themselves in this hobby, I am all for it.

I love the ST60's I still have 3 of the 60 class and a few smaller ones. Some planes are designed for nitro in such a way that it is difficult to mod them for E-power.

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You become a master at repair.
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Old 08-25-2017, 05:57 PM   #3
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This has a battery hatch but its very short ..... so fiddly to get a decent size LiPo in ... its really the fuel tank area with a lid !!

Cheers
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Old 08-28-2017, 10:02 AM   #4
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Guys at my club have been discussing with me final power solution for my WOT4 .....

4:1 in favour of E-Power !!

So WF 'rs ...... its a 4250 650kv / 4 - 5S setup back again on the cards !!

Just need to build a 32mm extension motor box to take the motor. Laser cutter in ops !!

Nigel

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Old 08-28-2017, 07:38 PM   #5
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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

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Old 08-28-2017, 07:52 PM   #6
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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 ...

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Old 08-30-2017, 10:40 AM   #7
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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.

Just waiting for weather now !!

Nigel

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Old 08-30-2017, 10:46 AM   #8
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Note I have extended servo arms so later once trimmed / sorted - I can dial her up for extreme antics.

Nigel

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Old 08-30-2017, 02:20 PM   #9
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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 !!

Nigel

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Old 08-30-2017, 06:20 PM   #10
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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 !

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

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Old 08-31-2017, 01:44 AM   #11
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Good one Nigel. Hurry up and get that video going... :-)
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Old 09-01-2017, 07:58 PM   #12
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Here's flight with 3S packs .... I made mistake - should have been 4S ... but in the rush to power up - picked up wrong ones !!



Then on 4S as it should have been !



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



Am I happy ? You bet !!

Nigel

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Old 09-01-2017, 10:43 PM   #13
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Very nice mate.
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Old 09-02-2017, 07:39 AM   #14
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Can't wait for weather to improve again !!

I have found some slightly larger wheels to help stop the nose overs ...

Nigel

222kph PKJ,EDF Concorde, Mini4,Mig3,T45,PKJ twin,ME109,Edge540,Cessna182,Skymaster Biplane,F15,F16,Badius,Ultimate,SE5,Qbee10,450 Heli,V911,J3 Cub Founder 9x forum: http://groups.yahoo.com/group/Flysky_RC_radio/
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Old 09-03-2017, 05:32 PM   #15
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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

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Old 09-04-2017, 05:44 PM   #16
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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

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Old 09-06-2017, 01:38 PM   #17
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Will be at flight site this evening ........... hope to test Smoke ...

Fingers crossed weather doesn't change !

Nigel

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Old 09-07-2017, 07:14 PM   #18
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What can you say ... its a WOT4 !!



Nigel

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Old 09-11-2017, 06:34 PM   #19
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Nigel

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