100" Mosquito Bomber for Electric Power

100" Mosquito Bomber for Electric Power

Postby Adam » Fri Nov 09, 2012 3:26 pm

We are currently Building the Mick Reeves 100" DH-98 Mosquito Bomber.

The power will come from a pair of AXI 53/30 F3A Outrunner Brushless Motors 235 rpm/v each running on a 10 Cell 5000mah Lithium Pack through a Castle Creations 85AMP Speed controller and Spinning 3 Blade 19 x 10 Props, All up about 8kw ( near 12hp ) of Power

Control is going to be provided by the Trusty JR PCM12x using a 2.4ghz DSM-J reciever and Digital servos all around , Retracts are Modified MR Products using Robart Air control System.

A am not going to give you a step by step guide to Building the model but just an overview of the things that are different to anything i have built before.

Adam..
Attachments
eeg.jpg
eeg.jpg (78.5 KiB) Viewed 14392 times
mosquitoEGE.jpg
It will look like this , but with Invasion Stripes to Aid visability , after flying a few warbirds I know how well they Disappear
mosquitoEGE.jpg (26.51 KiB) Viewed 14402 times
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Re: 100" Mosquito Bomber for Electric Power

Postby ash » Fri Nov 09, 2012 4:25 pm

Yay, more construction content! :D

Good luck with the build.
Adrian Hamilton > CL + FF

http://ashcustomworks.com
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Sat Nov 10, 2012 8:48 pm

The basic construction went together really well.
This kit comes with Laser cut balsa ribs but you have to supply all your own spars & sheeting etc.
Wing & Tail construction was very straight forward and we quickly had wing panels with Ailerons & flaps.
Attachments
wing panel.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Sat Nov 10, 2012 8:50 pm

While Dad was working on the balsa built up Wing & Tails I started on the engine mounts & working out how to cool these Monster Motors. ( more on that later if i remember )
Attachments
engine mount plate.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Sat Nov 10, 2012 8:59 pm

Once the tail is attached to the centre section it is a huge fibreglass moulding , There are 3 lasercut plywood spars ( leading edge , main spar & trailing edge ) the engine mount bearers run from the main spar through the leading edge to the front of the engine nacelle.
The Undercarriage is mounted onto the engine Bearers just behind the leading edge ( more details on this later ) then the motors will be attached to the front of these bearers using a carbon fibre reinforced plywood former ( shown previously ) this will also be epoxyed into the fibreglass moulding.
Attachments
centre section.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Sat Nov 10, 2012 9:07 pm

The gear doors were cut from the glass shells and hinged using a figue 2 shaped hinge and a 2mm pin through a plastic tube epoxied into the inside of the wheel well.
These hinges were required to allow the doors to open wider than the cutout so the wheels dont catch the doors on the way up.
Attachments
gear doors open.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Sat Nov 10, 2012 9:15 pm

Now the fun really started , trying to get the wing panels to fit onto the centre section , the holes cut in the plywood ribs were not in the right place , we spent hours with the Dremel & sanding drum carving slots in the endribs so we could get the wing panels to match the centre section & have the same dihedral and incedence on the left & right sides.

After much cutting the wing joiner tubes are glued in place with plywood doublers to hold them & plenty of epoxy & micro balloons to fill the gaps.

Now the wing panels are fitted its time to start thinking about the Flaps , the Inner one is easy , but the outer one needs to disconnect as the wing panel is removed and just to make it difficult the hinge line is not parallel to the wing joiner tube so i cant just use a square tube to drive the flap.
Attachments
wing on.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Sun Nov 18, 2012 7:16 pm

A little progress on the Mosquito in the last week, the stabs & elevators are all finished , the fin & rudder are hinged and all ready to attach.
This afternoon was the first time we had all the parts together , its a big model.

The flaps are giving us stress , the inner & outer flap dont share a hinge line so they cannot be connected together, also the hinge points marked on the plan mean that the leading edge of the flap protudes above the top surface of the wing as the flap moves down , thats not right , so on to the second set of flaps with the hinge point furthur forward , so its as far back from the leading edge as it is down from the top of the flap ( remember they are bottom hinged with a nice radiused front )
Attachments
plan view.JPG
the wings and tail are trial fitted & aligned.
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Re: 100" Mosquito Bomber for Electric Power

Postby Dale » Thu Nov 22, 2012 3:56 pm

Nice work! Can't have too many Mosquitos around the place.
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Sat Dec 01, 2012 8:03 pm

Had a bit of a milestone today , got the first retract to work under its own power with a robart air ram, it took a bit os messing around to get it all to clear the legs when they retract.
It was a bit of a bodge up job with a flexible pushrod and ball joint just jammed into the air cylinder , but it proved the geometery worked , so in the next couple of days i hope to jump on the lathe and make the proper metal fittings and install it all properly , then i think its time for another photo.

Starting to think seriously about the doors , i dont think the wheels will push them open like the real one does , its all a bit too flexible, thinking a mini servo on the back door hinge. maybe a mock up of that just to prove it.

Glad i have the JR PCM 12x this radio just makes it so easy to do gear and doors on separate channels with a programable mix and a delay between doors opening & gear coming down , then gear up and safe before the doors close.
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Re: 100" Mosquito Bomber for Electric Power

Postby DH100 » Sun Dec 02, 2012 9:12 pm

Any progress is good progress. Keep up the good work. I wonder how many others have itchy fingers for a Mossie. I understand the full size will be here until February, so I expect the airshow at Hood will be a sell out.

Brian
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Mon Dec 03, 2012 9:51 pm

Another good weekends progress, Dad now has the outer flaps & Ailerons hinged & the wing tips shaped nearly ready to cover the wing panels.

I have been working on the Retracts and flap horns inside, I have the inner flaps working now and have just started working on a joiner to operate the outer flaps, now thats not as easy as i first thought because as the wing slides off the joiner pins the angle changes and wont let me just use a simple square tube to drive the outer flaps.

While waiting for the epoxy to dry I had a play with a balsa mock up of a tailwheel , after version 3 I ended up with a system that will work & also clear the tailplane.
Now its dads turn to copy my balsa tailwheel design in some nice looking machined Aluminium.

There is not a lot of room in this model even at 100" its very difficult to position thing like Actuators for Main gear retracts & also the tail wheel retract, Flap servos and even the hinges for the gear doors get really close to the BIG FAT Wheels.
Attachments
tail wheel down.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Mon Dec 31, 2012 6:43 pm

We have made steady progress covering the wings and tails, a quick spray of primer revealed a million pin holes in the glass fuselage. A tube of tamiya putty later and its all looking good.
The wing panels very given a preshade around all the panel lines, not many on the top surface but plenty on the bottom, after the top coat is applied the panel lines should appear darker than the rest of the paint.
Attachments
preshade wings.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Mon Jan 14, 2013 5:11 pm

The LADO tech retract actuators have arrived & we have a main gear test setup on the bench.

They are great little units providing almost 60mm of travel and so much power you dont want to get anything caught in the pushrods.

They simply plug into the receiver , when they hit the end and cannot push anymore they turn off so in theory if the retracts jam they will stop pushing before they kill the batterys or regulator.
Attachments
KIF_2703.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Mon Jan 14, 2013 5:19 pm

I also gave up on the idea of making an aluminium tail wheel leg so i made this one from birch ply and painted it with Alclad paint.

Now i have the LADO unit fitted and working. I had to make a plate that will limit the travel of the arm so the LADO will stop before it runs off the end of the thread.

The mosquito tail wheel can only retract about halfway into the fuse before it hits the tailplane so i had to be sure it would stop before it pushed the wheel through the 1/16th balsa sheeting.

Adam..
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KIF_2704.JPG
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Re: 100" Mosquito Bomber for Electric Power

Postby spitty » Fri Jan 18, 2013 9:38 pm

Hello Adam,

I joined this board, because I was searching hours after the Mick Reeves Mosquito , one build log
in the UK stopped 2 Years ago..... :(
A few words to me, I' m 49 years old,live in Germany, rc modeller
since 37 years and I flew many Years as a commercial Pilot KingAirs and those stuff.
I'm in love with the Mossi since childhood and when Mick introduce his Mossi I ordered the Kit immediatly and was happy like on Christmas
Unfourtunately that is 5 years ago, I never had the courage to start the build, because I think,
You need time and energy for this project and will start it NOW!
(f.e. my GFK-Parts are white so it's difficult to see the correct position of all those spars, and
it's also difficult to check , that the glue is in correct place)
So I would be more than happy, if You would be so nice to post all the Pictures You have made.
( like a Top -Flight Manual ;) )

By the way: Your build is fantastic!

Many thanks for that in advance

Kind regards

Andy
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Thu Jan 31, 2013 10:52 am

Yes this kit requires a lot of work to make it, the only thing i can say is fit everything first before you glue anything , it took a lot of work to make the wing spars fit correctly.

The gear doors are also annoying me at the moment , Run some carbon fibre inside the gear doors and allow it to cure before you cut the doors out. My doors are twisted and they wont close properly.


If you need any more details or photos just ask.


Adam..
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Re: 100" Mosquito Bomber for Electric Power

Postby spitty » Fri Feb 01, 2013 7:00 am

Dear Adam,

I think, this is so a great build,You did a pretty good job and I' m
sure, that other boardmembers would be happy about more pictures
and information too.
For my person I would be very pleased if You would post as much informations
and pictures as You can...
Thanks for the advice with the stability of the gear doors.
By the way, I was thinking about going electric with the use of soundmoduls,
but I will go with 2 wonderful ENYA R155 Engines as planned before.
If You're interested: I have the copy from the first build from the Designer John Carpenter,
if You want I will send You the file as PDF (title was : Mosquito Saga)

Best regards
Andy
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Re: 100" Mosquito Bomber for Electric Power

Postby Adam » Mon Feb 18, 2013 5:31 pm

Thanks Andy I have a copy of that build, over 2 parts if i remember right.

Well after a months break from Mosquitoing I was happy to get a few hours in the workshop last night & most of Today.

The flaps ( Both inner & Outer panels ) are now hooked up and working on a 3 position switch on the front of the Transmitter.
The retracts and doors are now operating under their own power ( C/o Lado screw jack units ) and the rudder closed loop cables are connected.

The bottom of the Model is now painted RAF Medium Sea Grey. Maybe Next weekend i can put the Dark Sea Grey on the top then mask for the Dark Green , that will by difficult as i have trouble masking the curves. The invasion stripes SHOULD be easy , just Parrallel and equal width Black & White stripes on the wings and around the fuselage.

I am so glad i built the Airfix Palstic model first , it showed me how everything went together and how it should look.
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Re: 100" Mosquito Bomber for Electric Power

Postby spitty » Mon Feb 18, 2013 9:45 pm

Dear Adam,

I forgot, You have it pretty warm in Your Country in the moment, in Germany its winter and I have more
time for building.

Yes, the Airfix Mossi, the bog one, is so nice, and here´s one of the best builds ever..

http://www.militarymodelling.com/forums ... 50396&p=42 ( it´s worth to check all sites )

I learned much for weathering my little CM Pro Mosquito , I will post some pics soon.....

Thanks for Your assistance an kind regards...

Andy
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