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Tim's Skywriter Build

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Tim Ballinger09/02/2017 16:02:11
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137 forum posts
72 photos

So I have plans, wood and the critical item - straining fluid so I had better get started.

The CNC pack I had yesterday still has the fuzz cut short so better fix that to start with.

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john stones 109/02/2017 17:51:59
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8115 forum posts
1308 photos

Welcome aboard Tim, looking forward to following your build. smiley

John

Tim Ballinger09/02/2017 19:53:42
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137 forum posts
72 photos

interestingly even though the fuzz sides were cut short in the wood pack the actual length of the wood was just right. So I undid the cnc cut with some thin cyan , extended the lines and hey presto. Join looks good enough for now. will pay more attention later.

Doublers glued on , flush top and bottom as per plan not with the 6mm gap at the top as indicated in the original build log.

Tim Ballinger11/02/2017 10:41:33
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137 forum posts
72 photos

Really love the building jig. Might never have found that without you guys.

Certainly looks wide when you stand it up. Nothing glued as yet just wanted a look see.

Tim

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Chris Barlow11/02/2017 11:42:48
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1618 forum posts
1120 photos

Glad you like it Tim. Make sure you read and understand the instructions and use the grid to full effect! Don't forget to mark the center of the formers for alignment too.

The jig uprights aren't as stiff as they could be so use a square to check the fuselage sides against the base board. If you need to you can use elastic bands across the top of the black uprights to pull them in a little.

Looks good sitting there. Make sure you do a dry assembly run first before glue.

yes

john stones 111/02/2017 11:58:05
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8115 forum posts
1308 photos

You fitted the outer stringers yet or left them till fuzz has been joined ?

John

Lucas Hofman11/02/2017 13:16:57
453 forum posts
231 photos

Clever to fill the laser cut and extend the fuselage sides!

The plastic angles of the jig are a bit weak, resulting in the sides only being pressed in near the bottom. Often this does not matter but where it does I use rubber bands at the top. (see some pictures in the Gentle Curves thread if this is unclear).

Good luck Tim.

Lucas

Edited By Lucas Hofman on 11/02/2017 13:17:47

Tim Ballinger11/02/2017 14:13:25
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137 forum posts
72 photos

Yes John the outer stringers are on. I intend to talk nicely too it to it when bringing the tail together; perhaps with a whiff of ammonia !

Tim

Tim Ballinger14/02/2017 20:35:59
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137 forum posts
72 photos

F1 back to F7 all glued. Motor appears to point in the right direction.

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john stones 114/02/2017 21:07:11
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8115 forum posts
1308 photos

What motor/esc/lipo set up you gone for Tim ?

Tim Ballinger14/02/2017 21:22:25
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137 forum posts
72 photos

John, its an overlander 900kv,770W 3548/05, 60A ESC and a 4s Lipo. Spec says an 11x8 but thats is a bit of testing yet to do.

Tim

Tim Ballinger15/02/2017 08:04:33
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137 forum posts
72 photos

Not sure had the building entered knife edge . Better this way up.

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Tim Ballinger15/02/2017 13:58:20
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137 forum posts
72 photos

img_0881.jpgThe power of ammonia?

Admittedly it did not take as much pressure as I had been expecting but having clamped the tail posts together I gave each side, inside and out, below the tail seat a coat of ammonia. Left it couple of hours and took the clamp off to find it had pretty much set in the right position. Hopefully no dramas after it has been glued.

john stones 115/02/2017 19:00:28
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8115 forum posts
1308 photos

Looks perfect Tim. looks like i'll be buying some strain remover then wink side thrust is very noticable, the camera making it look more pronounced ?

Your lecky set ups very similar to mine, what mah you gone for with lipos ?

Joh

Tim Ballinger15/02/2017 20:50:58
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137 forum posts
72 photos

I think the spinner makes it look more.Calculated to cross the centre line at the prop driver which looks to be about right. we will see. Well currently i have a 3200 that I use in the the Riot XL so i may just get another if the setup works ok.

Tim

Lucas Hofman17/02/2017 14:01:16
453 forum posts
231 photos

Sound more then enough. With 900kv on 4 cell a 11x7 prop will give you more then 500W already. With too much power on tab you have to be careful with the throttle: Lots of power gives lots of torque and when that is applied at low speed you may stall the left wing.

I witnessed a crash on our (ice)field a few weeks ago where I think this is what happened. The pilot pulled the plane off at too low speed and went steep up. When things became unstable he jammed the throttle and a split second later he spiralled down anticlockwise. Since he was only 5-10 m. up he had no chance to correct. Lots of damage.

But then, you can always set the throttle endpoint under 100%. That gives you added flightime too.

Lucas

Tim Ballinger17/02/2017 17:27:54
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137 forum posts
72 photos

Bit like applying rapid full throttle with full flap, a thing to be avoided.

Tim

Tim Ballinger18/02/2017 18:00:46
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137 forum posts
72 photos

Made up the cabane struts. All seem to be in the correct plane. There were two failures on the way.

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Tim Ballinger20/02/2017 08:11:36
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137 forum posts
72 photos

So while musing over hatch latching (still not decided which method, perhaps both) I put in the control runs and then the rear stringers.

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Denis Watkins20/02/2017 08:17:42
1484 forum posts
65 photos

Now it looks the business Tim

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