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Timís Grumpy Tigercub

Build log- Electric and a smidge bigger...

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Lucas Hofman19/01/2018 10:43:14
595 forum posts
316 photos

Praise yourself lucky that stock came in when you needed it. It may take a while to get it delivered and film is always nice to have in stock. I have nearly all colours for "just in case". HK film is (in my humble opinion) way better than what ARTF marked as "covered with Oracover" come with and unbeatable in price.

Lucas

Rob Ashley19/01/2018 10:54:33
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206 forum posts
73 photos

Hi Lucas,

You seem to like the HK film? How does it compare to other iron on films? I haven't used it myself but the price is quite attractive for sport models. I wonder if you can prime it to accept paint - has anyone tried with this film?

Alas, I have already bought some Profilm for my GTC, but have a couple of own designs waiting in the 'wings' (thanks to the inspiration provided by Peter Miller) that will need a suitable covering - I may well get some HK stuff ahead of time.

Best, Rob

Nigel R19/01/2018 11:00:48
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1413 forum posts
309 photos

"local club at Marcle"

Nice neck of the woods, handy cider establishment nearby too!

Lucas Hofman19/01/2018 11:19:46
595 forum posts
316 photos

Hi Rob,

Yes I do. But I cannot compare to many other iron on films since HK is the only one I have used voluntarily. I have owned a Sebart Wind 50, which was covered in Oracover (it said on the box). The black did not stand Norwegian summer (which is not particuraly intense..). The black delaminated into a transparent top film that came off under flight and a slightly sticky black paint layer that was left. I got a piece of film from the supplier to repair and found it flimsy and more difficult to apply without wrinkles (compared to HK film).

Given that all alternatives a a number of times more expensive I stick to HK film. The only minus is that sometimes it is difficult to get the protective back to separate from the layer that is to be ironed on. I use 2 bits of masking tape in a corner, that usually works.

Lucas

Tim Ballinger19/01/2018 11:42:17
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430 forum posts
197 photos

Nigel R,

Yes Marcle is a lovely spot. Despite having joined before Xmas and it only being a 40 min drive I have still to get my act together a fly there . Probably just lazy as it is so easy just to carry a model out to the farm behind my house. Will be easier when the weather is more predictable and I do need to get down there as there is this thing called an A cert that I need which never existed when I learnt to fly.

Tim

Rob Ashley19/01/2018 14:55:03
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206 forum posts
73 photos

Hi Lucas,

That's good enough for me - I think I will get some HK covering and give it a go. Must admit the UK summers are not that intense either......

Best

Rob

Tim Ballinger20/01/2018 15:01:19
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430 forum posts
197 photos

Now that I know cg will be good had a final (hopefully) go at tidying the battery,esc and wiring connections from wing to fuselage.

Found a nice home for the esc’s under the servos which , I think, allows a more flowing cable layout for connection to the battery and easy connection to the motor leads coming from the wing. Added a cover over the servos to avoid any possibility of fouling of servo arms and cables.

Still left quite a lot of servo/power connections to make to the Rx which would have been a fiddle. I had some 6 pin ribbon cable and sockets rescued from a previous model which seem to have made life easier as there are now only 3 sockets to connect (5 if you count the motors ! ).

Still quite a bundle leaving the wing but not much I can do about that given all the stuff in the wings.

Here are the pics.

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Enjoy !

Tim Ballinger23/01/2018 14:20:09
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430 forum posts
197 photos

Having a bit of fun with Grumpy’s cockpit before doing anything to serious in the way of covering.

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Tim Ballinger24/01/2018 18:19:26
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430 forum posts
197 photos

This feels really difficult. It could take a long time.

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john stones 124/01/2018 18:40:21
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9682 forum posts
1435 photos

It looks difficult Tim, sure you'll get there though. wink

Paul C.24/01/2018 18:49:52
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450 forum posts
110 photos

I was going to say have you seen the solarfilm dvd on youtube but I I don't think you need too wink really good job on the covering I ended up with some wrinkles but fortunately underneath out of sight laugh​. I am using HK film covers ok and can handle plenty of pulling and tuging.

Pau.l

Tim Ballinger24/01/2018 21:51:02
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430 forum posts
197 photos

Yeah I’ll get there , the price you pay for wanting something to look a bit more like a real aircraft I guess. Bet the Tigercat designers didn’t plan on using shrink film when they made that sexy curve in the fuselage spine. Almost made me return to tissue dope and paint.

As Paul says HK film seems to cope with a fair bit of abuse . I’ll give it some more tomorrow!

Tim

Lucas Hofman25/01/2018 06:37:09
595 forum posts
316 photos

The fuse is easy if you do the aft fuse in 5 pieces: bottom first, sidene etter, turtle deck last starting with a straight side of a piece of covering at the side (to you have a straight seam there. Then over the top like you would do a wing tip, having at least an inch for your fingers to pull. Cut with sissors at straight as you manage 5mm over the top and iron down.

Repeat other side but now you should have enough overlap to cut at the centerline. If the seams turns out a bit ragged cut a stripe of film and cover it, so you get 2 straight seams a few mm. apart.

Try to get all sides fastened without wrinkles. At last tension at higher temperatur, left and right alternating. Sometimes (with HK) film on gets a white line at a seam if the covering shrinks. This can be removed with aceton.

And remember, if you make a mess of a piece you can always pull it, take a cup of tea and a deep breath and start over!

Lucas

Tim Ballinger25/01/2018 08:33:54
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430 forum posts
197 photos

The rear fuselage should be a breeze after doing the aft cockpit section which had curves in all directions. Actually managed that in one piece but the iron was up at 170 getting the last wrinkle out. Not sure at what point HK film melts but it sure does keep on shrinking.

Inner cowl lip gave me the most grief as the only the very tip of the iron fits in the hole. I see from the net there is a very small shoed trim iron availible in the US but it is expensive to buy in the UK and out of stock even if you wanted to shell out £75 . I resorted to to multiple 3x1 cm strips layer radially which I could just about get at. Finished it with a disc of film on the front to tidy up when I had done the outer cowl. Took a long time and was very fiddly. Open to any better ideas before I get to the port side. Resisting the paint pot solution atm !

Tim

Peter Miller25/01/2018 08:52:29
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9189 forum posts
1062 photos
10 articles

THat cowl is a work of art, especially the inner lip.

Protec did market a very small trim iron but I found that it never got hot enough for what I wanted to do with it. Possibly the American one would have been better

Nigel R25/01/2018 09:07:41
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1413 forum posts
309 photos

re: trim irons

I've never tried it, but I have seen it suggested that a cheap 100W soldering iron can be modified - shape the tip, then run it from a dimmer switch.

Lucas Hofman25/01/2018 10:38:06
595 forum posts
316 photos

I have the small trim iron (https://coverite.hobbico.com/accys/covr2750.html) and it works well, except you have to tape over the temperature slider. If you do not you end up at max temperature every so often, it is positioned just where my fingers are when I hold it.

Bought it in the US when visiting for USD 29 if I remember correctly. Of course it is on 110V so I needed a step down transformer too.

For the fiddly work it is great, but I do not use it often.

If you have a soldering station where you can set low temperatures I think the idea of a modified and well polished tip may also work very well.

Lucas

Tim Ballinger25/01/2018 11:10:36
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430 forum posts
197 photos

Looks like it could be very useful Lucas. Seems to be out of stock atm even if I was willing to pay the postage. Think you had the right idea and buy it on a trip or get a friend to bring one over.

I'll think a bit about the soldering iron solution but mine is gas powered and it might be difficult to control the temp !

My laborious method seemed to work on the first cowl so I'll probably repeat the process.

Tim

Tim Ballinger29/01/2018 17:07:32
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430 forum posts
197 photos

Wings finally covered.

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Ron Gray29/01/2018 17:54:31
924 forum posts
231 photos

Looking really good Tim, as I said previously, getting to the point of too good to fly!

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