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The Seagull has landed

Seagull Yak 54 - 90 size - SEA53B

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Gary Manuel21/08/2018 17:46:10
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1740 forum posts
1507 photos

Here's another issue to look out for if you are reading this thread and thinking of buying one - have a good look at the supplied wheels, and swap them for something better if they look at all brittle. This happened to BOTH wheels after one outing, with no particularly hard landings or "double take-offs". I've now swapped them for a pair of Du-Bro 3 1/2 inch low bounce treaded wheels.

gwm_1903.jpg

cymaz21/08/2018 17:52:01
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7784 forum posts
1017 photos

I never use the supplied wheels. As you say Dubro yes

Gary Manuel21/08/2018 19:13:14
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1740 forum posts
1507 photos
Posted by cymaz on 21/08/2018 17:52:01:

I never use the supplied wheels. As you say Dubro yes

Down side is that they are quite a bit heavier.

Bruce Collinson21/08/2018 19:15:19
98 forum posts

Gary, can we assume these fit the spats, or are you flying without them? Need another trip to the Precious Shop and they’re shut tomorrow when I will be nearby!

BTW picked up spare spats at Elvington swap meet for a fiver, but resisted unused wings for £25 on the basis that I have yet to wreck a wing without demolishing the fus.

Have put hard blocks on firewall for cowl screws.

BTC

Gary Manuel21/08/2018 21:04:53
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1740 forum posts
1507 photos

I didn't fit the spats. The supplied wheels are quite chunky so most other wheels of similar diameter should fit. I would say that the ones I have used will easily fit.

Gary Manuel21/08/2018 21:07:06
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1740 forum posts
1507 photos
Posted by Bruce Collinson on 21/08/2018 19:15:19:

Have put hard blocks on firewall for cowl screws.

Probably the best and easiest way IF you haven't already drilled the cowl.

Bruce Collinson21/08/2018 22:09:01
98 forum posts

Of course I’ve drilled the cowl!

Just Vannesa’d post heavy exhaust addition and it looks like my batteries are going where yours are. Has your tray worked out ok? Looks fiddly to get at the batteries so far back.

It’d better fly after all this!

Gary Manuel21/08/2018 23:10:42
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1740 forum posts
1507 photos

I did actually move the CoG forwards a bit. I think I did it while I was fixing the canopy tab back on. Battery was actually more difficult to get out of the rear position than it was to glue the tray in with the battery already fitted to the tray.

My battery is now where the receiver was and the receiver is on the opposite end of the tray that my throttle servo tray is fitted. Wiring is still as neat because this is the position I initially planned for and made all the servo leads for this position. I'll post a photo of the final arrangement tomorrow.

I've sorted the warped tail by wetting and then heating with pressure applied. Looks better now but I had to peel back the covering on one half of the tail and it's not gone back on perfectly. All I need to do now before I test fly it again is check both wings for twist. I have a horrible feeling that these might be twisted too - fingers crossed.

Also had the fuel tank out to dry the oil residue from the tank area - I've now fitted a crank case breather tube so that the waste oil drains OUTSIDE of the fuselage blush

Edited By Gary Manuel on 21/08/2018 23:11:03

Gary Manuel21/08/2018 23:14:52
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1740 forum posts
1507 photos

Talking of CoG, Did someone say that it's possible to make a Diana Rigg out of what I've got laying around the house and a few bits from Screwfix? Hmmmm.

john stones 121/08/2018 23:21:13
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9830 forum posts
1462 photos

Purdey sure it was mentioned, your honour.

Gary Manuel21/08/2018 23:24:31
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1740 forum posts
1507 photos

I'm not sure that what I've got laying around the house would be too happy mind wink

cymaz22/08/2018 05:30:14
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7784 forum posts
1017 photos

Here

Here

Gary Manuel22/08/2018 11:18:27
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1740 forum posts
1507 photos

Thanks Cymaz but I was more interested in the Diana than the Vanessa.

Gary Manuel22/08/2018 16:58:38
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1740 forum posts
1507 photos

As promised, here's a few photos of my revised equipment positioning.

My original battery shelf is now just supporting one of the satellite receivers.

gwm_1907.jpg

The batteries are now on my original receiver shelf.

gwm_1908.jpg

The receiver has been moved to here.

gwm_1909.jpg

Bruce Collinson22/08/2018 17:05:31
98 forum posts

And how much weight is Diana requiring in the tail? You confirmed my fears about the batteries so far back, although I need to compare your pics with my fus as I'm not sure I have the horizontal former with the circular/oval hole immediately behind the canopy.

I start to wonder whether Seagull continually modify this plane.

Things lying around, per Cymaz; a plank, string and deadweight ... it is a very useful bit of kit.

Martin Harris22/08/2018 17:14:04
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7774 forum posts
196 photos

Those fears may still not be justified - my blue/yellow 120 FS powered (and later 180 FS) version needed the batteries (2 x 2S 18650 1100mAh LiFe) mounting on a piece of 1/4" balsa sheet to get them as far back as the construction would allow!

Gary Manuel22/08/2018 17:29:44
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1740 forum posts
1507 photos

This next bit is what I've been putting off until the last minute as I'm dreading where it might lead.

Anyone following the thread may remember that I've not liked the way the model behaves in tight loops. I've found and fixed a problem with a warped tail, but I also suspected that the wings may also be warped because of the amount of aileron left trim it needed.

Here's how I checked the wings - starting with the right wing.

Aileron clamped in the neutral position and Clinometer zero'd using the canopy seat as a reference.

gwm_1910.jpg

Root was measured at 0.1 degrees.

gwm_1911.jpg

Tip was measured at -0.2 degrees and has a chord of 220mm. That's minus 0.2, so there is 0.3 degrees of (clockwise) twist in the wing (the trailing edge at the tip is higher than at the root).

This calculates at 220 Tan (0.3) = 1.15mm, which sounds reasonable to me.

gwm_1912.jpg

Now on to the left wing.

Clinometer zero'd as before.

gwm_1913.jpg

Root measured at 0.4 degrees.

gwm_1914.jpg

Tip measured at -1.0 degrees.

That's a total of -1.4 degrees of clockwise twist.

This calculates at 220 Tan(1.4) = 5.37mm (The trailing edge at the tip is lower than the root).

gwm_1915.jpg

So the right wing tip is 1.15mm high and the left tip is 5.37mm low - or 6.52mm total.

No wonder it needed so much left trim and it's not flying properly!

Now has anybody got any suggestions for straightening the wings up?

I've tried a bit of heat with twist pressure applied but it's made no difference. The whole wing is quite stiff, but apparently twisted!

Bruce Collinson22/08/2018 17:32:56
98 forum posts

try to find the new wings which were at Elvington?

Martin Harris22/08/2018 17:39:11
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7774 forum posts
196 photos

Ouch! You've got a nasty streak in you Bruce...wink

Gary Manuel22/08/2018 17:40:55
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1740 forum posts
1507 photos

It's the best suggestion so far ....

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