Oodalally

If all the other points raised so far such as CG are OK then I suggest a very close look at the wing to see if there is washout or wash in on this wing.

Peter's recent designs have a special wing build sequence which uses the LE &TE sheeting pinned down first which gives clearance for the slightly curved underside of the ribs without using other packing. This method works well and the sequence needs to be be followed exactly. However if another method of building is used then maybe some unexpected twist occurred? Would be interesting to know if Donald used Peter's sequence or used some other method of wing construction.

Why not ask a club member to fly the model when repaired just to see if it behaves in a similar way with another pilot. Just a thought ! Cheers ps but there again after repairs it may fly in a different manner any way LoL

To update you all I have repaired my Ood hopefully for a final time. The right wing now has a slight warp I can do nothing about due to a difficult repair and the fuse has exterior 1/32 ply plates on each side as it's broken in half there before. I carefully rebalanced it to make sure the CG is exactly per plan. The flying is not too bad considering its repeated surgery but I still have to land fairly fast if it's not to drop too hard on the deck on flair out. It has to be flown in all the way and if I don't get a bounce or two I'm lucky. If our field wasn't an aircraft carrier strip there would be no problem as I could just grease in anywhere I fancied, but that's not the case so we have to land accurately.

Hi Peter, Hi all. New member and I wish I'd found this topic before I started building Oodalally just before Xmas. I'm going electrickery with Turnigy 1450, 80A ESC, 4S 2200 and 8x4 prop. My build quality isn't a patch on some I've seen here but I've hand cut this from tiled PDF downloaded from Aerofred. My first what I call scratch build.
I see some here have built it from a CAD cut wood pack. Is there a CAD file available that I could laser cut from? My cutting skills mean the formers have given the fuselage an interesting shape, which has lead to having to use gauge sticks on the wing LE's to get the horizontal stabiliser true.
I've used 9g servo's in the wing and in the rear of the fuselage.
Covering starts soon. The article says to cover the rear stabiliser before gluing in place. I suppose this is much easier than after?

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I ought to set my profile name. Didn't realise the user name was going to be site name. It's Mike by the way and thanks for the welcome. I will be posting in the new members section saying hello, I got to the end of the topic and signed up. I have looked at that jig and I actually bought the wood to build the plane from Slec.
I've just found a laser cut wood pack at Sarik hobbies and very reasonably priced compared to what I paid for wood alone. I will be building more so a jig I think will be essential

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Hi MIke

Welcome to Oodallay!

I have to say that I don't have a jig. I just use a pair of mark 2 calibrated eyeballs!!!

Another tip for the tail. I spot glue a piece of scrap 1/4 sheet down wherfe the tailplane goes. THen I spot glue another scrap of 1/4 sheet down where the fin goes. FInally I spot glue peices of 1/2 sheet or block in and shape gthe whole lot to match the rear of the fuselage.

Separate all this and you will have two blocks to fair in the the fin and elevators. This saves so much fiddly carving and shaping if you try and shape them with the tailin place.

Also you can cover the two fairing blocks before assembly...Again much easier.

I think the laser cut parts from Sarik are only the shaped parts not the full quantity of balsa needed. They can supply another pack of standard lengths of balsa to complete the build in some cases. Extra cost of course. So you still need a supply of balsa!

You could look at any of the other builds on the forum for extra tips and photos of some of the tricks and techniques. Also look at " Features" at the top of this page where there are many articles available under the different headings.

Our mum had something lined like that jig on her kitchen floor, which has just reminded me of the lino our dad used when resurfacing a work bench. Getting things in line isn't my problem, it's cutting by hand at the dining table.
With these vari-focals the sides of everything are curved.
I've seen that method used for fin fairings on a Piper cub build.
I'll log in using my phone at some point and get a few pictures up.

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Hi Mike and welcome to the forum and your Oodalally build. I don't know which 9g servos you are using but I thought I would mention that some 9g servos work fine in lightweight depron models but may struggle a little in an Oodalally. The ailerons may not be so critical but I would tend to use something like these Corona DS929MG servos. For the elevator in particular I would be inclined to use something with a little more power like a Hitec HS85MG or alternatively this. Your chosen servos are probably fine but I thought I would just add my 2p worth.

Edited By Piers Bowlan on 12/02/2019 14:11:50

Preshaping the fairing blocks works well for me also. I needed to do that on my Grumpy Tigercub model.

If you use the micro servos metal geared ones are essential.

I got some Turnigy ones from Hobbyking which actually have a torque of 3 Kg per cm on six volts.

Tower Pro servos. Metal gears, high torque. I've seen them in the same position on similar planes so hopefully there wont be any issues.
I come from steel fabrication, IT and (lifelong hobby) motorcycle engineering. So I have some transferable skills but aeroplanes are nothing like anything I've worked on so I'm tuning my eyes and learning different methods and much "her" chagrin, my tools collection is expanding

I've just remembered something from earlier in this thread about control horns breaking due to UV. We always used black zip ties on the bikes over white or clear for this reason

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Would second the above posting about going to a bigger servo, something around 20g at least. The Hitec HS85MG are a good shout. 9g servos are fine for 1lb foam models, but a bit out of their depth on a 3 or 4lb wood build, in my opinion.

" I'm going electrickery with Turnigy 1450, 80A ESC, 4S 2200 and 8x4 prop"

Just a thought, what is the exact motor you have? The combination of 8x4 prop and 80A ESC for this model seems a bit odd.

There was a batch of horns made about the time of Oodalally that were brittle

SLEC scrapped the whole batch. Apparently the p;astic was not the normal type that they used. Not their fault.

I still bend them every so often but never have a failure since.

THat 8X4 prop sounds uselless for a model of the size. It is alwys more efficient to move a lot of air backwards slowly and a 10" prop or even bigger.

Why not give George at 4-Max a call.He will advise very accurately what you need. I know that I always call him for advice and it works.

In fact I will be calling him tomorrow for advice on mylatest design/