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Acro Wot ARTF (balsa) chat

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David Davis10/01/2017 08:45:54
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2528 forum posts
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The Laser 70 weighs 580 grammes or just over 20 ozs. The Laser 80 weighs 690 grammes or about 24.3 ozs, and it is physically bigger.

Phil 910/01/2017 10:01:35
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3892 forum posts
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I love the laser 70 on my artf acro wot. It is just the right amount of power. It will climb well vertically but not unlimited. It will start to loose energy eventually. But it makes for some more interesting flying.
. I. it

Daniel Cardona10/01/2017 11:21:47
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140 forum posts
251 photos
I dont remind mine as being overpowered or with unlimited vertical performance, but if with the 70 you wont need any front ballast, then go for it.
Bill_B10/01/2017 16:40:32
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Posted by Jonathan M on 09/01/2017 21:55:06:
Posted by Bill_B on 09/01/2017 17:45:26:

For those using a .70fs, what is the flying weight of your Acrowots?

ARTF now with no extra lead, 92oz, 22 oz/sq ft, easily enough power with ASP 70FS, 12-15 min flight times with a 10oz tank, flies perfectly on the specified balance point.

Thanks for the reply Jonathan. thumbs up

Jonathan M10/01/2017 19:22:25
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237 forum posts
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No probs Bill, but just to note that I made a couple of minor errors in my earlier post (which I can no longer edit).

My final weight (having swapped to a smaller battery and lost 2oz of tail-lead) is now in fact 94oz. Wing area is actually 640 sq in, so loading is 21oz/sqft.

According to Chris Foss' website, the original IC kit is a slightly smaller 594 sq in, with weights between 80 and 90oz depending on engine, thus loadings of between 19 and 22 oz/sqft.

Daniel Cardona11/01/2017 18:18:58
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140 forum posts
251 photos

Any way here's mine fitted with the Laser 80, the ARTF model i believe has a much wider cowl so a laser 70 should fit very nice. since i dont use pressure feed from the exhaust i was thinking to use a flexible exhaust, fabricate a nice P-Clip from a piece of brass and attach it to the undercarriage ply plate so to direct the exhaust better under the aircraft. laser's and acro-wot such good British combinations..love them!

regards Daniel

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John Allen11/01/2017 19:14:42
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216 forum posts
33 photos

ASP 91FS, ARTF flew wonderfully, next one will be the XL

John Allen11/01/2017 19:18:30
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216 forum posts
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Jonathan M19/01/2017 23:05:25
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237 forum posts
49 photos

This is what happens to your stock ARTF Acro Wot if you don't replace the supplied metal U/C bolts with nylon alternatives...!

Purpose of my session this afternoon, having finally fitted the cowling and sorted static balancing (30g to tail, 20g to port wing tip) was to settle trims and rates for both normal flight and with landing-flaperons. Patch has been a bit of a mess recently, with a labyrinth of mole tunnels and hills, plus winter mud and the residue of sheep-shit from their Christmas visit.

Arrived to find mole-catcher had set first of his traps in southern half of N-S runway. There was still more than enough run into the gentle northerly for both takeoff and a careful landing, but I hadn't factored in the sudden dead-stick half way through the tank. Wasn't then ready - having safely cleared the trap marking-poles on my way in - for the excessive glide-speed without the slowing effect of a turning prop, and floated on fast beyond the north end of the runway. As she came down, at some distance from the flight-box, the undercarriage clipped a mole hill and ripped off in one clean snap, then she belly-landed in the soft grass.

The damage is easily repairable (including getting rid of the funny rebate behind the cowling which is unnecessary for IC), and I'll fit new captive-nut and NYLON bolts!dsc_0192 copy.jpg

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Edited By Jonathan M on 19/01/2017 23:09:12

Phil 919/01/2017 23:17:59
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3892 forum posts
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I m not surprised you r​ipped out the U/C looking at the state of the field. That's the scale equivalent of trying to land 747 on the Brecon beacons

Jonathan M19/01/2017 23:37:18
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237 forum posts
49 photos

Its not all that bad... I just ran out of the good bit! blushdsc_0205 copy.jpg

Jonathan M20/01/2017 07:38:52
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237 forum posts
49 photos

I reckon the guy who made this one had burrowed all the way from Ayer's Rock...

 

 

 

 

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Edited By Jonathan M on 20/01/2017 07:40:44

John Allen20/01/2017 09:36:48
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216 forum posts
33 photos

The funny rebate behind the cowling is for two strokers, and I don't see any good bits in that field ;(

Bill_B20/01/2017 09:52:04
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1145 forum posts
11 photos

I'm sorry to see your bent AcroWot Jonathan, but I'm not sure that nylon bolts would have prevented much less damage than what's already been done judging by the size of those mole hills!

The possibility of deadstick issues is just one the reasons I've converted to electric power after using ic motors for well over 30 years of model flying.

Jonathan M20/01/2017 10:14:27
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237 forum posts
49 photos
Posted by Bill_B on 20/01/2017 09:52:04:

I'm sorry to see your bent AcroWot Jonathan, but I'm not sure that nylon bolts would have prevented much less damage than what's already been done judging by the size of those mole hills!

Thanks for the commiserations Bill.

I'm working on the theory that a more robust solid ply mounting which bonded to the fuselage nose area with, say, 4mm nylon bolts should result in snapped bolts rather than reconstructive surgery to the airframe. A properly designed 'weakest-link' (with a few spare bolts) should do its job whatever causes excessive shock to the undercarriage... a carelessly-heavy landing or an unfortunate clip of Pen-y-fan.

Timothy Harris 120/01/2017 11:43:20
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384 forum posts
58 photos

Sorry to  see that too Jonathan. I have the Kit Balsa not ARTF Acrowot with an OS80(the one in my header!). I have had it about 2 yrs and it is flown a lot. It's a bit heavier than the ARTF but flies very well. The reason I built the kit version is that I could strengthen it properly especially the undercarriage. It's much easier when you have full interior access while in construction. I have seen loads of the ARTFs rip undercarriage. Mine as no problem if I have to put it down in the adjacent ploughed field 😳. By the way I don't believe dead sticks are a good reason to choose electric, I have seen plenty of electric planes having to make forced landings too😊, but that's another discussion. I'm a committed IC fan especially for this model. ( I do enjoy foamies and electric helps occasionally). I like the Acrowot so much I'm considering another for a spare. I'm actually now half way through my Wot4 kit which will be a great winter hack and great fun with its air brakes. If I build another Acrowot I might put them on that too and increase aelieron depth to compensate 😊

Edited By Timothy Harris 1 on 20/01/2017 11:47:14

Edited By Timothy Harris 1 on 20/01/2017 11:47:39

Edited By Timothy Harris 1 on 20/01/2017 11:48:02

Timothy Harris 120/01/2017 11:53:36
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384 forum posts
58 photos

Nice plane too Daniel. Rather than flex exhaust etc, I would just turn the exhaust round and point it down running out through bottom of cowl. That's what I m doing in my laser powered wot4 and already do in my laser powered Wots Wot XL. Connecting extra pipeoutside the plane might be a bit messy and cause drag.

Edited By Timothy Harris 1 on 20/01/2017 11:54:08

Bill_B20/01/2017 14:31:53
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1145 forum posts
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Posted by Timothy Harris 1 on 20/01/2017 11:43:20:
..... By the way I don't believe dead sticks are a good reason to choose electric, I have seen plenty of electric planes having to make forced landings too😊, but that's another discussion. I'm a committed IC fan especially for this model.

Hi Timothy, I would have sent you a private message but your profile isn't public so I'll make a very brief interlude here: There are many other reasons for perhaps choosing electric power in the Acrowot (and other airframes), but eradicating dead sticks was one of my main reasons, not the sole reason. Also, I've been flying various electric powered aircraft for many years now and have yet to experience a deadstick landing. wink

Bill.

john stones 120/01/2017 14:46:36
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8161 forum posts
1315 photos

Looks like the I.C v Lecky debate is as tricky to eradicate as the moles are face 1

Stop making mountains outa molehills wink

John...aka Jasper Carrot

John Allen20/01/2017 15:14:12
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216 forum posts
33 photos

As a matter of interest, if you leccify a standard/artf balsa Acrowot, where do you make the battery hatch?

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