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Tony Nijhuis 72 Mosquito Build Log

Electric Version

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Mike Beard 128/11/2017 21:48:25
34 forum posts
8 photos

Here is my latest. Top cote on, control surfaces installed and ready for camouflage!

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Geoff Gardiner29/11/2017 21:45:29
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354 forum posts
610 photos

Hi Mike

That looks neater than a neat thing - very nice.

A have got a couple of Turnigy SK3 Aerodrive 5045/660kv motors which I hope to use.

What motor/battery combo are you using for power (or is it ic)?

Martin McIntosh30/11/2017 14:41:45
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2774 forum posts
1037 photos

If it of any help, I used TGY 50/50 Propdrive motors on 4S Multistar 5200`s. It was not over powered on this set up but is to an identical spec. to Tony`s original.

Mike Beard 130/11/2017 15:09:00
34 forum posts
8 photos

Geoff,

I have built this around Rimfire 80's, 60A ESC and 6s 3700 batteries. I calculate about 5 min flight time. The 80's are probably more than needed, but that means I can run them probably nice and easy. The Props will be counter rotating 3 Blade 14X7..

Martin, Can we see pics of yours? I am eager to learn anything I can! How does it fly? Do the Flaps help with speed and landing? Thanks!

Martin McIntosh30/11/2017 17:43:44
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2774 forum posts
1037 photos

Just type `Mossie` into the forum search box and all is revealed.

Geoff Gardiner03/12/2017 20:31:26
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354 forum posts
610 photos

Little bit more done:

Glued on the nose cone and filled.

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Test fitted the rudder/elevators.

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Used the dremel to trim the spinners.

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Glued the mounting blocks to the back plate.

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More later...

Martian03/12/2017 21:48:11
2124 forum posts
1030 photos

Coming along nicely Geoff

Geoff Gardiner10/12/2017 21:58:45
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354 forum posts
610 photos

Snowing today so spent a bit of time in the workshop.

Finished the spinners:

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Finished painting the pilots:

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Painted and weathered the exhaust stubs:

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Painted the bits that I have 3d printed for the cockpit:

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More later...

Geoff Gardiner07/01/2018 19:31:14
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354 forum posts
610 photos

I have spent a few weeks procrastinating over starting the covering using fiberglass and resin.

This time I am using the Bucks composite fiber and resin and applying it using the roller method.

I have done one side of the fuselage and the underside of the wings so far. First impressions look promising.

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More later...

Concorde Speedbird07/01/2018 23:06:54
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2713 forum posts
628 photos

That looks excellent, I look forwards to seeing more.

Mike Beard 108/01/2018 16:15:42
34 forum posts
8 photos

Geoff,

Looking good! How do you plan on attaching the canopy to the glassed fuse? I am a bit ahead of you and pondering that problem!

Mike

Mike Beard 108/01/2018 16:21:16
34 forum posts
8 photos

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Mike Beard 108/01/2018 16:23:07
34 forum posts
8 photos

Also, I have put it together for the first time with batteries to test balance. With the glass and retract tail it is tail heavy with the spinners from the Kit. I am using Ally spinners from Tower Hobbies that are heavier and balance the plane perfectly!

Martin McIntosh08/01/2018 16:51:50
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2774 forum posts
1037 photos

Are those spinners pointed like the ones I had to use in the end or nearer the correct shape? Difficult to tell from the pic. Mine got destroyed in the crash but like yours they made a big difference to the cg.

Canopy. There has been a bit on the forum recently addressing the problem of gluing on a canopy. I have started to use DeLux Materials R/C Modellers glue which sticks to most things but does not set hard. With care it can be used for this and does accept paint.

My Mossie. Looking at the repairs now but alas it is worse than I thought. I gathered all of the bits but some seem to be missing. Should keep me entertained for a while but it will be done in the end.

Mike Beard 108/01/2018 17:27:37
34 forum posts
8 photos

Martin,

I used https://www.towerhobbies.com/cgi-bin/wti0001p?&I=LXDZDC&P=7.

Not perfect shape but good enough. You definitely need Ally spinners or it's weight in the front. So for me, since you need the weight anyway, might as well have "quality" spinners..

Thanks for the glue tip, I will look it up.

What happened in your crash? Any flying tips?

Mike

Martin McIntosh08/01/2018 19:33:25
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2774 forum posts
1037 photos

Mike, nothing wrong with the model. The port ESC only produced about 1/4 power at take off on the second flight. It had already lifted and was too late to abort. See `Mossie` thread for more details. The motor and ESC wiring set up will be revised when it is eventually repaired. If this had been i/c powered I would of course have detected the power loss straight away.

Mike Beard 108/01/2018 19:46:26
34 forum posts
8 photos

Martin,

Really sorry to hear that but thanks for the tip. I will check very closely RPM on each motor before my maiden this summer..

Mike

Chris Walby08/01/2018 21:52:14
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894 forum posts
213 photos

Its relevant to electric Mosquitos although mine was a BH version the issue was not model related, but electrical.

I bought the model ready to fly from a chap who was clearing an old club members stock so everything installed.

On the day to maiden it the port motor would very occasionally counter rotate about 45 degrees and then pick up to match the starboard, mid and full throttle was faultless for short durations. At home motor and ESC out and on the test rig with no issues evident. Spoke to LMS who said any kind of drag/binding could cause this issue.

There has been much debate about IC twins and what to do if one quits and one suggestion was to set random on you flight sim and practice and then practice some more! Have a plan should something untoward happen.

All back together and down the flying field one quite evening, no apparent issues with ground run and take off plus a few circuits to trim it in.

Then in good old 633 squadron style, high back leg, full throttle dive towards the flight line flowed by pitch change from the props. I had just enough time to line it up and belly it on the flying field. Closer inspection showed the motors connector bullet had burnt off the cable with very little solder evident although the heat shrink sleeve was holding it well in place.

As others have said me and I echo their advice, practice on a simulator if you can and fly with a backup plan should something untoward happen. It might just make the difference between a change of pants or a full bin liner of scrap.

Concorde Speedbird08/01/2018 22:03:41
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2713 forum posts
628 photos

I was wondering if, with a live telemetry feed, you could have RPM sensors on each motor and set a warning if there is a significant difference between the two values (obviously a tolerance level would have to be set). This would at least alert the pilot to a power difference. I don't know how effective it would be in practice, but it would make an interesting test.

Geoff Gardiner08/01/2018 22:06:27
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354 forum posts
610 photos

Hi Mike.

Yours is looking very nice.

On my Spitfire I used Formula 560 Canopy Glue.

It takes ages to cure but is flexible and has done a good job.

I plan to do the same on the Mossie.

Geoff...

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