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Author Topic: Dart Kitten  (Read 1807 times)
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Yak 52
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« on: December 27, 2013, 09:34:39 AM »

Here's my pseudo-dime scale Dart Kitten nearly ready to cover. The scan shows the rough plan but it will be finished if the thing flies.

Weight of the bones was 3.7g but it needs to be light as the wing area is a bit limited. In fact the fuselage is more like peanut size.

Jon
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Dart Kitten
Dart Kitten
Dart Kitten
Dart Kitten
Dart Kitten
Dart Kitten
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Dave Andreski
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« Reply #1 on: December 27, 2013, 10:49:24 AM »

Hi Jon,
The Dart Kitten is a very pretty aircraft and your Model will be a head turner.
Dave
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Russ Lister
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« Reply #2 on: December 27, 2013, 04:00:51 PM »

Beautiful work Jon - would make a nice little kit  Smiley
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OZPAF
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« Reply #3 on: December 27, 2013, 04:08:53 PM »

i agree with Dave - very attractive aircraft and model. I like the dihedral break being outside the fuselage as per fullsize - it looks practical - combining the undercarriage and dihedral strong points in one area.

The exhaust on the fullsize looks very British Grin The forward mounted pipe facing down with the brace behind it.

John
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« Reply #4 on: December 27, 2013, 04:20:43 PM »

'Near' perfection as always Jon!   Wink
Looking forward to seeing this maiden soon!
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Yak 52
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« Reply #5 on: December 27, 2013, 06:14:54 PM »

Thanks chaps (and welcome to the goo-meister Smiley). It's not a sleek aircraft but it has a perky, alert look about it and it has simple lines. The engine won't be getting much detail because it's a dimer. But maybe I'll add the exhaust (when I've got it trimmed  Shocked)
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Yak 52
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« Reply #6 on: December 28, 2013, 12:22:31 PM »

Got quite a bit done today. The fuselage is covered (pre-shrunk red esaki) and the instrument panel installed. The panel was drawn up in Paint with the help of some flight sim screenshots and then printed small but at high resolution (600dpi)
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Balsa Ace
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« Reply #7 on: December 28, 2013, 01:00:15 PM »

Very nice,and great looking instrument panel too.

Scott
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« Reply #8 on: December 31, 2013, 01:45:35 AM »

Meticulous and precise work, lovely model. Congratulations.

-Paul
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Yak 52
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« Reply #9 on: December 31, 2013, 09:37:35 AM »

Thanks guys. Here's a quick photo of current progress.

The tissue on the fuselage is attached with dope and thinners, which is my preferred method. The silver is done with Pritt Stick (the new formula is more like Uhu) I'm still finding that glue stick slips when I shrink the tissue but I may have overdone the steaming - after all that how you open envelopes  Roll Eyes

I will be adding the silver over the red for the rudder and wing roots as this looks better than red on silver.

The nose block is laminated from 3 sheets of 1/4" balsa and sprayed silver.

The UC looks a bit stalky - it's extended slightly to give me about a 5" diameter prop. The tubes are from a cotton bud. The wheels are turned on a drill with an aluminium tube hub. The whole UC/wheel weighs about 0.5g per leg. The legs are sandwiched by a balsa sub rib but I may reinforce the spar in the centre section.

Also shown in the pic is the wing root - the root rib is straight but the fuselage side curves in at the front as per the full size. The side frames were rolled under a pen to get this curve.
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Re: Dart Kitten
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Re: Dart Kitten
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OZPAF
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« Reply #10 on: December 31, 2013, 05:29:52 PM »

Neat as always Jon. Crisp covering and those turned wheels caught my eye. Did you use some sort of form tool? I can't even get simple streamlined wheels symetrical.
John
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Yak 52
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« Reply #11 on: January 01, 2014, 06:14:50 AM »

Hi John, no form as such. The blanks are cut with an Olfa compass cutter. The inners are 1/16" and the outer 1/32". All the blanks are cut oversize, the inner two are glued together and then I drill the hole for the ali hub - this is almost inevitably off centre as the balsa is soft Roll Eyes so I CA the tube hub in (spin on a bit of wire to check alignment), add the rims (by eye) but then use the tube to centre the compass cutter again and trim off some excess. You can't get all of it off with the cutter so I trim the rest with a scalpel using the compass cut as the new outline. This and a few swipes of sand paper gets it round enough to turn in the drill. Not sure if this makes sense in text Undecided
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« Reply #12 on: January 01, 2014, 04:45:36 PM »

Thanks - that does make sense. Using the tube hub as the centre whil turning in the drill is the big advance on my technique. Using a mandrel directly in the balsa doesn't give much support!
John
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Yak 52
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« Reply #13 on: January 04, 2014, 01:48:51 PM »

All done!  Smiley

I struggled quite a lot with getting the silver to shrink - it finally did but there are a few wrinkles  Undecided In fact there are quite a few "that'll have to do"s but I just wanted to get it in the air and move on.

Finished weight is 9.4g which gives me a cube loading of 3 and a wingloading of 0.28g/in2. It will need a smidge of nose weight and so the AUW with the motor will be about 11g.

I forgot to mention that the tailplane is scale size - there's a healthy tail volume of 0.55. The prop is a Peck 6" cut down to 5.125".


Should be flying tomorrow  Smiley
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Re: Dart Kitten
Re: Dart Kitten
Re: Dart Kitten
Re: Dart Kitten
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Russ Lister
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« Reply #14 on: January 04, 2014, 01:58:29 PM »

Very nice Jon .... hopefully will see it flying tomorrow

I can imagine it will float around quite nicely  Smiley

(the Bushfield meeting is in the afternoon isn't it? .... paranoid that I will turn up to departing crowds!)
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Yak 52
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« Reply #15 on: January 04, 2014, 02:04:08 PM »

Thanks Russ, yep 2-5pm. Bringing the Tripe?  Smiley
I should have the BD5 ready again too.
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« Reply #16 on: January 04, 2014, 02:09:16 PM »

I hope to Jon .... it's in a fairly 'non-commital' state at the moment. The motor mount plate is just wedged in with Blu-Tac in case I need to make changes!
Hoping that will hold enough to get some trimming done.

Hopefully I will remember the video camera! (don't worry ... I don't do interviews!)

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Pete Fardell
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« Reply #17 on: January 04, 2014, 05:02:44 PM »

Looks lovely, John. Hope for flight pics soon.
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Ace Dugan
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« Reply #18 on: January 04, 2014, 05:44:48 PM »

Jon, that's very very nice.  The colors really make it pop.  Looking forward to the flight report...
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Dave Andreski
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« Reply #19 on: January 04, 2014, 07:11:56 PM »

Jon,
Very nice! the amount of detailing is spot on.
Dave
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Monz
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« Reply #20 on: January 04, 2014, 08:39:39 PM »

Jon, have you tried the silver Hobbycraft tissue yet? Shrinks beautifully, both types.
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tross
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« Reply #21 on: January 04, 2014, 09:55:58 PM »

I think you've done a great job with the silver. Smiley
It's never been very friendly.
The gear doesn't look stalky at all. Grin
How are the small details on the fin and side of the fuse created?
Well done. Great little plan. Smiley

Tony
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« Reply #22 on: January 05, 2014, 12:42:11 AM »

Lovely plane, nice work.  Smiley

-Paul
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Yak 52
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« Reply #23 on: January 05, 2014, 12:35:56 PM »

Thanks guys.

Monique, the tissue is another domestic one labelled 'Presentor' - I haven't tried HC yet but I will. I found it needs a light water misting to shrink it - steam just didn't get it wet enough and was lifting the glue stick.

Tony, the logo on the fuselage was drawn with silver gel pen - a technique I shamelessly pinched from John Ernst. I chickened out of drawing straight on to the fuselage so drew it on red tissue and added it as a tissue decal.

The fin decal is an Air League sticker - the text is printed on white tissue (it's readable but my camera's not up to the macro detail) and the blue flashes of the logo were added with biro.


The flying went ok today. It does have quite a tip stall tendency in spite of washout Grin but that was no surprise. As a result I was flying it faster than any respectable Kitten should! I was using a 9" loop of 3/32 and about 600 turns but it was a bit over powered and so the transition to glide and landing was slightly stally with inevitable wing drop. The odd good flight ended with a landing on the wheels  Roll Eyes Next time I'll try a thinner motor.

Russ got some video of it, and his tripe was also going beautifully: once he'd persuaded his pilot that 'stunting' a few inches from the ceiling was not the best idea...  Cool


Jon
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« Reply #24 on: January 05, 2014, 02:34:45 PM »

The Kitten was going well Jon  Smiley .... I have plenty of video that might take some time to upload and edit!
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