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SE5a - dogfight double

Build thread for sept 2003 RCM&E plan

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Dad_flyer06/08/2019 23:04:54
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133 forum posts
152 photos

Thank you Dan and DM.

I am enjoying the build, but it is fiddly finding where to put things with such a small fuselage.

Dad_flyer07/08/2019 20:40:35
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133 forum posts
152 photos

The wing has to go on, so the battery and ESC positions need to be finalised. Finally after a day of trying different things, including ESC in the cowl, I have the ESC position. Opened the hole in the front former to hold the wires, and a BBQ skewer to hold it up.

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A cable tie or blob of hot melt glue on the motor wires will stop it sliding back.

This keeps the ESC out of the way of the battery.

Edited By Dad_flyer on 07/08/2019 20:41:05

Dad_flyer07/08/2019 20:48:49
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133 forum posts
152 photos

Then the battery needs a tray to guide it to the hole in the front former and hold it forward, while also allowing me to get it in and out.

The final holder, liteply base and balsa bits.

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Front lip of the ply thinned to just the top sheet, to locate in the former.

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The slope helps the battery in over the lip. To get it out I can (just) reach in and lift the wires with one finger to raise the battery over the lip.

Installed:

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Dad_flyer07/08/2019 20:56:16
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133 forum posts
152 photos

I kept some thin balsa shavings from earlier. Glued a couple of these on each side to smooth the battery box sides into the hole to make sure there is no lip for the battery to catch on.

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You need to zoom in to see them.

The battery in:

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It is quite cramped, but not too difficult to get in and out for each flight.

Airflow is through the grille on the cowl and out of the cockpit.

Dad_flyer10/08/2019 21:42:29
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133 forum posts
152 photos

The obligatory dry fit photo. A patchwork of colours. The grey is Halfords plastic primer over yellow Easycoat. Covers well.

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Bottom wing is now attached and have been painting it up before fixing the tail, struts and top wing. The light colour I have for the underside of the wing is a Humbrol acrylic gloss. The coverage is really poor. The green is a Humbrol acrylic matt, which covers in one coat.

Dad_flyer10/08/2019 21:57:16
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133 forum posts
152 photos

Spent a large part of today on the lower hatch over the servos. On the plan it is a piece 1/2" wide behind the wing, then a loose plate. I made it from a single piece of liteply, with a deep score nearly through from the inside. Then covered with tissue and dope to make a hinge with the top layer of ply.

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Fastened at the rear with a couple of small servo screws into blocks from an offcut of the spruce struts. I might add a lug under the front to hold the hatch in the normal way in case the hinge splits.

You will see in these photographs that I did not follow one of the instructions - cover all parts before fitting _except_ the lower wing. I covered it before fitting, so I cannot now shape it into the lower decking.

Dad_flyer11/08/2019 12:18:00
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133 forum posts
152 photos

Now the dry fit is more picturesque.

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Dad_flyer11/08/2019 12:20:57
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133 forum posts
152 photos

Next, Tony says:

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How?

In the dry fit, the upper wing is too far back, by about 4mm, and too low down. I have made a jig for the leading edge relative to the fuselage, but the outer struts hold far away, so how do I make sure the wings are parallel and I am not building in twist?

Dad_flyer11/08/2019 21:17:55
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133 forum posts
152 photos

Putting the model on a support at eye level and turning it round and round I eventually got all the measurements correct: leading edge 1mm lower than trailing edge and the upper to lower wing gap the same at both ends, front and back. Thin cyano wicked in to the strut sockets and all being well that is now done correctly.

daniel handley11/08/2019 22:41:08
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71 forum posts
18 photos

hi dadflyer

have sent you a pm.

Dan

Dad_flyer13/08/2019 20:34:00
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133 forum posts
152 photos

Now the airframe is in one piece I can check the CG properly...

And...

It needs nose lead sad.

At least there is space in the front cowl, so nice as far forward, and all up weight (with battery) is still short of the 24oz design weight.

Dad_flyer18/08/2019 16:45:40
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133 forum posts
152 photos

Come to refitting the rods and control horns, but the horns are too long and hit the sides of the fuselage. Had to look back in my own thread to see that I have moved the servos and intended to shorten the horns, but I never actually did it!

Dad_flyer18/08/2019 21:13:05
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133 forum posts
152 photos

Tail surfaces joined with cut down fluffy mylar hinges as detailed on the plan. Glued with cyano down the pin holes. I may pin as well, as the holes are there.

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Putting the ball link on the inside of both rudder and elevator horns makes the rod line up, but it is a bit tricky to push the cup onto the ball...

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This is once I had worked out how to get the rods back in with the wings on. The z-bends mean they have to come through the tubes from the servo end. It worked by passing them back from the servo hole to the cowl through the battery hole, then they can thread back into the tubes.

Dad_flyer18/08/2019 21:18:23
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133 forum posts
152 photos

Servos linked up.

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This close hole on the horns gives the throws of 12-15mm as required. I have put a little ply tab over the hatch hinge position, just in case. Receiver will go up against the rear former in here.

Hatch closed.

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Now I am just putting off bending the landing gear wire.

Dad_flyer19/08/2019 20:54:35
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133 forum posts
152 photos

The wire bending was not too traumatic actually.

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That is one of those illusions that sometimes I see inside out.

daniel handley19/08/2019 21:22:16
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71 forum posts
18 photos

Looking good df. I take it the axle is soldered to that frame? Maiden cant be far off now.

Dad_flyer19/08/2019 22:11:57
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133 forum posts
152 photos

Yes, the axle is soldered across the bottom of the frame. I am making up the saddle clamps, so that I can clamp the wire square and true to a board before soldering. All being well it will then hold in the right shape.

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