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The Seagull has landed

Seagull Yak 54 - 90 size - SEA53B

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Gary Manuel17/05/2018 15:31:12
1500 forum posts
1353 photos

I have been looking for an airframe to replace the Slipstream MX-S I destroyed at last years DVMFC open weekend. It had a lovely Saito 150 engine in it which was crying out to go into another model.

I've had my eye on the Seagull Yak 54 - 90 size for a while as they look great and all seem to fly well. The Saito 150 might be a bit on the large side as the recommended 4 stroke engine is a 125. Better too large than too small though and the weight / physical size difference is minimal.

This is the little beauty that will be going in to the model. The Dubro Soft Mount is already drilled and tapped for the Saito engine so I'll be using this.


The model cowl fitment requires the engine to be mounted such that the measurement from the engine box to the spinner backplate is 140mm. I measured mine ......


..... and it's 166.5mm. Obviously a problem with this mount, but this is the challenge I'm happy to face. 26.5mm (166.5 - 140) needs to be removed from the front of the engine box


I could have just about got away with using the supplied mount with a bit of trimming. This would have given the required 140mm and avoided the problem, but would have resulted in the throttle lever being very close to the firewall. I'd rather spend a bit of time and effort to get more accessible controls and less vibration due to the Dubro Soft Mounts.


Edited By Gary Manuel on 17/05/2018 15:32:28

Gary Manuel17/05/2018 15:42:43
1500 forum posts
1353 photos

Line drawn 26.5mm from the front face of the engine box.


Razor saw used to cut along the line.


New firewall made from good quality ply. I'll fit a piece of lite-ply over the hole later.



Firewall epoxied in place to make a nice strong engine box.


Reinforced internally with triangular stock......


.... and pinned externally using barbecue skewers.


Rich too17/05/2018 16:16:48
2565 forum posts
1001 photos

nice one Gary, sub'd yes

cymaz17/05/2018 16:25:25
7539 forum posts
975 photos

Excellent work as always young Gary......I’m in and watching cool ( btw....very pleasant here in Hurghada at the moment....34 and sunny hothotcocktail)

Edited By cymaz on 17/05/2018 16:27:03

Gary Manuel17/05/2018 16:38:24
1500 forum posts
1353 photos

Use plenty of sun screen Cymaz.

Must admit - I had to look where Hurghada was blush

Rich too17/05/2018 16:41:07
2565 forum posts
1001 photos
Posted by cymaz on 17/05/2018 16:25:25:

Excellent work as always young Gary......I’m in and watching cool ( btw....very pleasant here in Hurghada at the moment....34 and sunny hothotcocktail)

Edited By cymaz on 17/05/2018 16:27:03

We had our 3rd trip there this Easter. yes We didn't make it but the new marina is supposed to be worth a visit. And not the best location, but I can recommend the food at the Hard Rock Cafe wink

Edited By Rich too on 17/05/2018 16:41:40

cymaz17/05/2018 16:44:22
7539 forum posts
975 photos

I’ve sidetracked Gary for too long now......back to the coal face lad !

Gary Manuel17/05/2018 17:39:30
1500 forum posts
1353 photos

The cardboard wing tube liner looked a bit fragile, so it's has a couple of layers of glass cloth. The dark bits are where the resin has soaked in but the light coloured bits aren't dry. They must have had a thin coating of glue which has stopped the resin from soaking in


Nothing special about the hinges. They are the standard furry cyano type, which are perfectly up to the job. T pins used to centralise the hinges between both surfaces.


All sufaces are now hinged, with the exception of the bottom rudder hinge, which will by glued later when the fin is joined to the fuselage.


john stones 117/05/2018 17:49:16
9252 forum posts
1419 photos

Cracking model, soft mount ? bit rattley Saitos then crook

Had 120 in mine your 150 will be perfect. yes

Giz a go.face 1

Biggles' Elder Brother - Moderator17/05/2018 19:05:23
15145 forum posts
1407 photos

Nice Work!

It's always a bit "heart in the mouth" isn't it when you take the saw to the brand new out-of-the-box expensive model!! Well done for resolving to do the job properly and not bodge it because its easier in the short term.


Edited By Biggles' Elder Brother - Moderator on 17/05/2018 19:05:59

Gary Manuel17/05/2018 21:37:24
1500 forum posts
1353 photos

Yes BEB.

It's definitely a case of "measure many times and cut once". Makes it worse when doing a live blog. Nowhere to hide if I've got it wrong.

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