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Wots Wot ARTF

Lower Wing Dihedral

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Tom Doyle10/03/2015 10:43:13
65 forum posts

Has anyone building the new Ripmax Wots Wot encountered a lower wing dihedral issue? The instructions on page 3, Step 5, refers to dihedral on the underside of the wing joiner implying that when fitted, it would induce some dihedral on the lower wing which, I understand, is a desirable feature on biplanes. With my wing joiner fitted, and the two root ribs of each wing half butted firmly together, the underside of wing is perfectly flat.

If dihedral is intended, how is it to be set because no dimensions are specified in the instructions?

Mr.B.10/03/2015 11:58:02
413 forum posts
26 photos

I think the instructions just mean that the wing joiner is tapered so make sure you have it the right way up. I glued mine up with the root ribs butted together.

Tomtom3910/03/2015 12:36:31
686 forum posts
1 photos

Hello Tom,

Same issue here but it seems to fly fine.

Jon Laughton10/03/2015 19:09:46
1186 forum posts
72 photos

I assembled mine per the instructions and it flies fine

Paul Adams10/03/2015 22:35:06
217 forum posts
22 photos

I had the same problem, the instructions show the joiner being flat on one side and not the other, but the joiner I had was near enough symmetrical. So I just glued it in place and everything aligned ok.

Tom Doyle11/03/2015 12:00:01
65 forum posts

Thanks for your replies so far, reassuring to know model flies OK with no bottom wing dihedral. Question, how did the fit up of the interplane struts work out? Were they long enough? If they were the correct length, then to my way of thinking, the designer intended the lower wing to be flat with no dihedral. With dihedral on the lower wing, I'd expect the struts to be too long because dihedral would reduce the gap between upper and lower wings.

Bob Cotsford11/03/2015 13:56:38
8152 forum posts
449 photos

a suggestion - assemble the upper wing onto the fuselage and dry fit the lower wing halves to see how the struts measure up!

Tom Doyle11/03/2015 20:21:25
65 forum posts

I have considered that Bob but with others having already built and flown the model, I was taking the lazy way out.

Mr.B.11/03/2015 22:36:11
413 forum posts
26 photos

The struts fitted fine with no fettling.

Tom Doyle12/03/2015 10:55:00
65 forum posts

Thanks Mr B. that's a great help. I'll be gluing up my wing later today - with no dihedral!

Cuban812/03/2015 12:45:34
2837 forum posts
1 photos


QED. 11th photo down in the gallery.

Edited By Cuban8 on 12/03/2015 12:46:51

Tom Doyle12/03/2015 16:25:15
65 forum posts

Thanks guys, I think Cuban8's link is the final proof, a flat bottomed wing it is.

Jon Laughton25/03/2015 19:12:03
1186 forum posts
72 photos

I have clocked up a few flights with this model now and I have to say it is delightful to fly: stable yet agile...I would recommend it for regular aerobatic flying

Paul Marsh25/03/2015 19:30:15
3816 forum posts
1102 photos

I flew mine on Sunday and didn't need any trim adjustments. had two flights.


Tom Doyle25/03/2015 20:47:15
65 forum posts

Thanks again guys for your feedback. My wing is now glued and the wing bottom is flat. Interestingly, and I got this bit of info recently from a well informed model shop proprietor, the new ARTF Wots Wot is actually designed by Ripmax, albeit based on the original by Chris Foss, hence the various differences. If this is wrong, I'm sure someone will correct me.

Tom Doyle25/03/2015 20:48:56
65 forum posts

Meant to say great photo Paul. Is that your actual model?

Biggles' Elder Brother - Moderator25/03/2015 20:49:58
15748 forum posts
1460 photos

My bottom wing is flat, struts were fine and it flies excellently. I've had literally hundreds of flights out of it - its been my regular winter hack this year an I think its come with me on every trip to the field since early September. I'd recommend to anyone who wants an aerobatic hack that's just badly behaved enough to stop it being boring! wink 2


Paul Marsh25/03/2015 22:13:52
3816 forum posts
1102 photos

Yes it is. Chris filmed it on Sunday.

Chris Barlow25/03/2015 23:36:58
1897 forum posts
1303 photos

Video of Pauls WotsWot flying last Sunday. One flight at the start and one at the end so you'll have to sit through all of it! devil

john stones 126/03/2015 00:20:26
10874 forum posts
1490 photos

Enjoyed the video lads, compliments to the cameramanwink


p.s language Timothyangel

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