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A4 Skyhawk build

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Old 12-01-2012, 07:45 AM
  #126
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Default RE: A4 Skyhawk build

Hi Sean

Thanks, I'm glad you've enjoyed the thread We only set the igyro up on the ailerons so I can't really comment yet on the whole package. It worked well in roll however the GPS was over compensating the gain so the airspeed factor needed setting to 3. We didn't get time to dial it in properly. Hopefully once its painted I'll get a chance to return to RAF Alconbury and set it up properly.

Cheers, Alex
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Old 12-01-2012, 10:09 PM
  #127
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Default RE: A4 Skyhawk build

Hi Alex,

Great thread mate and really nice build on your A4.

I'm also about to test fly a SM A4 bought 2nd hand and your thread has been really useful on various detail. The previous owner was also involved in the initial test flying of the prototype and has given me some control throws and CofG suggestions but would appreciate knowing what throws you ended up settling on?

Could you please measure the elevator and aileron horn length from skin surface to clevise pin hole and let me know the distance...thanks!

I have fitted mine with a Kingtech 140 and I was advised to set the CofG at 330mm back from the LE but think I'll start with your recommended 300mm suggestion!

I'll try and upload a few photos but at the moment I'm getting an error message when I try attaching.....

All the best

Rene
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Old 12-02-2012, 12:39 PM
  #128
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Default RE: A4 Skyhawk build

Hopefully the photos attached this time!
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Old 12-02-2012, 12:43 PM
  #129
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Default RE: A4 Skyhawk build

Hi Rene

Thanks, nice part of the world your from! I lived in Auckland for 2 years while I was with CTC McAlpine. Great country planning on taking the family back out there in the next few years for a few months holiday ....anyway I digress...

The measurements you wanted are 11mm for the elevator horn although I didn't install these and would have liked it to be 15mm. The aileron horns are 15mm but you could get away with less. I went with as much movement as possible on the elevator and Ali flew round on high rate and was happy, if anything it needed a little more. The ailerons were on the low rates with around 1/2inch of movement. Sorry I cant measure them exactly but the model has been prepared for the painters and Ive removed some of electronics.

The CG was set at 300mm and could go a little further back. Ive tried to attach a picture that Skymaster sent me to explain where its measured from if it doesn't work send me your email via Facebook or PM me you address.

I hope this helps

Cheers, Alex

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Old 12-02-2012, 12:45 PM
  #130
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Default RE: A4 Skyhawk build

p.s. ignore the measurements on the photo, I'd say 300 was a mid point CG...
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Old 12-02-2012, 12:51 PM
  #131
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Default RE: A4 Skyhawk build

Must have posted at the same time, Your model looks great! Good luck with the maiden and I like the scheme on the Stickmaster
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Old 12-02-2012, 01:19 PM
  #132
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Default RE: A4 Skyhawk build

Hi Alex,

Thanks for the info likewise we did'nt install the horns either and think they should be longer as the servos are currently working over a very small movement range which is not the best!

I have that factory photo Anton sent showing the CofG thanks but based on your flights will start at 300mm and move back from there. The previous owner of my A4 was Jason Starkey who did the prototype flights, his throw recommendations were 27mm for Ail & Ele and 30mm for rudder, these were final figures after initial test flights that were very pitch/roll sensitive based on factory recommendations, I'm presuming the ele & ail are total movements (approx 12.5mm each way)...

The photos show my scratch built BAC 167 Strikemaster at 1/5th scale as well, worked on both as an engine fitter during my time in the RNZAF so it's kinda nice to have these as turbine powered models to fly some 30 years later!

Just for interest I machined up a semi scale machine gun and using one of Dean's (Jerseymodeler) drybreak fittings use the machine gun as the fill port for the aircraft, seems to work fine.

If you ever come back to our beautiful country you'll have to come say gidaye! plus I'm 20 minutes drive from Ohakea airbase which we have recently got jet flying access to again nice...will be the site of the A4's test flights.

Will post some flying shots in due course, keep up that nice build of yours it's brilliant!

Cheers.....Rene
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Old 12-02-2012, 05:06 PM
  #133
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Default RE: A4 Skyhawk build

A Kiwi with an Aussi Scooter! Whaaaat!!?? Just kidding - beautiful A-4 and your scratch built BAC 167 - what a beautiful work of art!
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Old 12-02-2012, 05:42 PM
  #134
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Thanks Eddie I know......bit embarrising really but in a twist of fate I'm about to change the roo's for kiwi's on the roundals and low and behold it becomes a genuine RNZAF aircraft!

How so....well turns out that "887" was one of 10 A4's purchased by the RNZAF and operated out of Nowra, 887 was flown across the Tasman in June 1984 in those colours (but with kiwi roundals) to RNZAF Base Ohakea. Several months later it was repainted in the RNZAF scheme of the day and renumbered NZ6214...so for at least a few months of it's life it was officially an RNZAF aircraft in this scheme.

Besides I didn't fancy trying to repaint the aircraft...big job!

Thanks for your nice comments on the Blunty she flies great on a PST 1300 with AUW around 29lb, main departure from scale is she's being flown by George W!!! not that it's obvious from the photo

Cheers.........Rene
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Old 12-02-2012, 09:39 PM
  #135
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Default RE: A4 Skyhawk build

Alex,

Would you mind sharing your technique for cutting the access hatch out of the fuselage?

After seeing your port side forward hatch I'm considering this approach for fitting batteries rather than on a tray inserted via the cockpit but wondering how you achieved the nice close fit of the hatch.

Cheers.....Rene
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Old 12-03-2012, 01:18 AM
  #136
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Hi Rene

I tend to only do hatches on models that need painting. I use a scalpel, 10 or so blades and plenty of patience. This way the join is only the width of a blade. If you do it on a painted model you'll chip the paint and raise the sides of the join without the ability to sand them back. You can order touch up paint from SM, If you do the hatch you'll most likely have to re spray that part of the camouflage.

Cheers, Alex
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Old 12-07-2012, 12:44 AM
  #137
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Default RE: A4 Skyhawk build

Today the A4 goes in to the paint shop to start the transformation, it will be insignia whit where the roundels and flags are, nothing special, I will post a couple of photos later when it's done.
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Old 12-07-2012, 01:19 PM
  #138
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Here is the start on the painting process, other may do the sequence differently but I was always told light to dark, anyway here goes.













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Old 12-07-2012, 02:07 PM
  #139
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Interesting that you do the white first... Not being a painter I would have painted the flags on at the end but then I suppose I would have needed loads of coats and it would of ended up looking like a raised panel...

Glad I got you to paint it
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Old 12-08-2012, 06:56 AM
  #140
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First paint mask on and second colour













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Old 12-10-2012, 03:08 PM
  #141
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Default RE: A4 Skyhawk build

Underside now painted





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Old 12-12-2012, 02:21 AM
  #142
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Default RE: A4 Skyhawk build

Underside masking today, as you will see I have left the blue area bare. The next colours are the upper camo scheme.

Wings done, fuse next







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Old 12-12-2012, 07:17 AM
  #143
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Default RE: A4 Skyhawk build

First coat of the light sand colour on the fuse



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Old 12-14-2012, 08:50 AM
  #144
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Default RE: A4 Skyhawk build

All of the base colour now applied on the upper surface now it's time for the masking of the camo.

















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Old 12-14-2012, 09:15 AM
  #145
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Default RE: A4 Skyhawk build

OK we are getting serious now!
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Old 12-15-2012, 07:14 AM
  #146
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Default RE: A4 Skyhawk build

Green on today, wings, tailplanes, tanks and refuelling probs first







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Old 12-15-2012, 08:55 AM
  #147
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Default RE: A4 Skyhawk build

Fuse painted now, masking for the blue strips on the wings and the underside of the fuel tanks













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Old 12-16-2012, 05:35 AM
  #148
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Default RE: A4 Skyhawk build

Blue going on today, and black later on
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Old 12-17-2012, 05:12 AM
  #149
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Default RE: A4 Skyhawk build

Looking good Phil!

On a different note, I had reason to send the nose oleo back to Taiwan for repair as it leaked when the gear was up and I couldn't cure the problem with new seals. I sent this back to Li Kai in Taiwan who designs the gear for Skymaster. Its been repaired and sent back all with in two weeks They also supplied me with some of the scale parts free of charge as these were not included when Ali picked this up at Jetpower in 2010. I'm very pleased with the service and support I've received with this model...thanks Skymaster.

Cheers
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Old 12-18-2012, 05:03 AM
  #150
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Here we go with the last batch of photo's

Enjoy



















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