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CY Model P-51D Mustang 2.4M - 85cc

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Old 06-09-2017, 08:50 AM
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Default CY Model P-51D Mustang 2.4M - 85cc

Hi Folks, just starting a build thread up about my new project. This is a new direction for me as I'm mainly in to jets, but.... for many years I had always dreamed of having a Mustang and figured that this year I would just go for it. I'm not pushed on having anything 'super scale', so what I'm aiming for is sports scale and reliable Sunday flier.

Coming from jets, sound is important to me and while no 'model' engine can match the sound of the infamous Merlin I do want something that has a nice tone to it and not be like the "whipper snipper" style glow engines I used to fly years ago so I knew that I would have to go multi cylinder right out of the box. There is a balance point here though in that as soon as you go multi cylinder INLINE the price goes shooting up through the roof I would like to have got a 3cylinder but in honesty I found a good deal on a Roto 85FSi 2 cylinder so decided to go that way instead. I read that people complained the Roto does not have as much power as it should etc but I found a video of a CY Mustang fllying with the Roto 85 and it all looked (and sounded) roughly like what I was looking for so opted to bite the bullet. If needs be maybe I can upgrade to a 3cylinder inline in the future but there's a huge price jump for that one additional cylinder so...

The Roto presents very nicely, nice box and the engine looks great and comes with ignitors, instruction manual and basic open exhaust pipes.

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Old 06-09-2017, 08:56 AM
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I ordered the P51 from bigplanes.nl, it took about a week to get from the Netherlands to Ireland and the box turned up in great shape. Pretty huge box though so I had to unpack everything in to my car - I found it was very well packed in a double cardboard wall box and bigplanes had included their own padding to make sure everything arrived without damage.

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Old 06-09-2017, 09:03 AM
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A buddy of mine called over to help with the model unpack, inventory, and check over and we had a great time exploring the kit. I was really shocked by the wingspan - 2.4m seems a bigger when you hold it tall!

hi

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My wingman holding the model together on the stand for a quick shot. It looks more manageable like this.

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Pretty much everything was good and everything is there. We did discover one issue though - I opted for the electric retracts bundle with the kit and it turns out that my oleos don't fit in to the 13mm Electron trunion correctly. I need to take off about .7mm to get them to slide home... bugger!

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I made a start on grinding down the pins and it's looking good so far - hope to get them fully fitted tonight - wish me luck!
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Old 06-12-2017, 02:13 AM
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I managed to grind the pins down to a nice close fit, and then hand finished them with wet and dry - 400, then 600, then 800, then 1250, then 1500. They're still a little cloudy, and I am very tempted to sand them further and buff them with compound, but I'm also eager to get on with building the model. They fit nicely for now - might pretty them up later.

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Starting on the kit, I grabbed a couple of servos and the elevator halves. In this kit I am using HS-5685MH (12kg) on the ailerons and elevators, Rudder and flaps will use HS-8335SH (25kg). Theyr'e all HV servos and can run straight off a 2s Lipo which simplifies things.

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While CY have gone to a lot of trouble to make up the servo mount system, I took the opportunity to run around the edges with some thin CA just to make sure everything was sticking well. I also glue checked some joints in the elevator halves. Everything well glued on the bench, but with little knocks in transport or storage sometimes things can come loose - especially where the factory has been building for lightness. Thin CA is great for this because it seeps in to two wood halves and bonds as one chemical solid.

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Old 06-12-2017, 02:13 AM
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Checking the control surface and factory drilled hinge holes with supplied hardware

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I also CA hardened the back of the elevator and hing cut outs in the control surface. This gives a paintable surface which I lightly and quickly painted over with Tamiya Metallic Silver on a brush. The idea is that if the control surfaces are moved at the field you don't see wood in the gap. This kit is only 'sport-scale' so no need for too much effort here but I just prefer not to have wood showing on a WWII warbird that was made of metal.

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The glue is drying on the hinges now so will continue with the build tonight...
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Old 06-13-2017, 03:42 AM
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Hinges are dried on control surface so after touching up silver paint time for a dry fit and quick blip on the drill bit to make sure everything fits well.
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The servo doors are predrilled, and included kit screws used to put in a thread to screw in to. This wood is all fairly soft though so afterwards everything hardened by wicking with thin CA
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Plenty of control horns in the kit because it's all double horn with ball link. The glue side is smooth and the edges are rough but we need it the other way around. A bit of work required to prepare for install
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Old 06-13-2017, 03:45 AM
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I'm going with a removable elevator setup. Using the kit hole I marked and drilled a screw hole in the rod, then installed a 30mm dowl rod in the pipe.
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Underside of the elevator with holding screw installed. The second side is done after the first is finished to make a perfect finish.
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Elevators screwed in place. Still more to do in this area but it's a good start!
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Old 06-13-2017, 03:45 AM
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I'm going with a removable elevator setup. Using the kit hole I marked and drilled a screw hole in the rod, then installed a 30mm dowl rod in the pipe.
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Underside of the elevator with holding screw installed. The second side is done after the first is finished to make a perfect finish.
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Elevators screwed in place. Still more to do in this area but it's a good start!
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Old 06-14-2017, 02:50 AM
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No photo updates today, but a quick summary from last nights activities:

I wanted to install a washer on top of the elevator retaining screw and found that below the covering was a captive thread. Checking in the kit contents I found sure enough that there is a pair of 3mm cap head bolts for the tail. This is a nice touch but not mentioned anywhere in the manual? :O

After looking at how it goes together I found that the idea is to put the aluminium tube through and then pinch the elevators to the rod. This will work, but it's not my ideal way of getting it to work. If the bolt rattles loose then everything can come apart. So I took some time to drill out my previous holes to a larger size and tapped the skin, so now the bolts screw down through the tail and in to the tube itself. Just a bit of gunging up the threads with locktite and everything should be secure for bolting on and off on flying days (hopefully!)

Other than that I also received some HobbyKing wing bags in the post, thankfully the Mustang wings fit the wing bags. You can squeeze two wings in to one bag, but it would be too tight to put in the wing joiner tube and elevators also so I recommend using two bags.
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Old 06-14-2017, 02:53 AM
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For anyone that is looking for the wing tote bags, these are the ones I went with and they work: https://hobbyking.com/en_us/hobbykin...-72-x-7cm.html
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Old 06-15-2017, 09:07 AM
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I uncovered a captive thread in the tail plane and nice cap head bolt in the kit parts - no mention in the manual though?? still nicer than the screw system

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Ball links that come with the kit for included (but not pictured) rods, they look impressive at first site however I found two were cracked straight out of the bag. Think I'll get metal ones...

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Standard horns are cut out of G10 and look to be ok. I cut them to size and roughened them up for gluing. The mounting plate to keep everything square is a nice touch.

[img]www.rcparkflying.com/rcpf/p51/DSC_4536.jpg[/img]

I used the mounting plate as a template to reveal the balsa

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Old 06-15-2017, 09:07 AM
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I uncovered a captive thread in the tail plane and nice cap head bolt in the kit parts - no mention in the manual though?? still nicer than the screw system

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Ball links that come with the kit for included (but not pictured) rods, they look impressive at first site however I found two were cracked straight out of the bag. Think I'll get metal ones...

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Standard horns are cut out of G10 and look to be ok. I cut them to size and roughened them up for gluing. The mounting plate to keep everything square is a nice touch.

[img]www.rcparkflying.com/rcpf/p51/DSC_4536.jpg[/img]

I used the mounting plate as a template to reveal the balsa

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Old 06-15-2017, 09:08 AM
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Filling the cut outs with Aeropoxy

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horns glued down with ZAP. Once the aeropoxy goes off it will be a very solid setup

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Breaking out the Tamiya silver to colour code the horns.

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Old 06-15-2017, 09:09 AM
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double post for some reason
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