TeamMuir1

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Hi again Guys.
I figured I would post some pics of my P-51.
I have a Saito 150 Golden Knight in mine I love the way she flys

Oosiksmith

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Michael,

In response to your question, I am using CJ P-51 gear designed for the TF P-51 kit with four inch Robart scale warbird tires. With this set-up the inner gear doors will not be in the scale location. The distance from the wing centerline to the bottom of the inner gear is about one inch. If you move the gear mounting blocks inward then the pivot point for the gear strut will be in an incorrect location. When down, the gear leg should be outboard of the step on the leading edge of the wing. I've attached the pictures you asked for. One of the reasons I haven't glassed the wing yet is I'm still trying to decide how I will do the inner gear doors.

Thanks for posting pics of your plane. I'd like to hear more about how the plane flew with your engine. Also, if you have pictures of the cooling holes you had to cut in the bottom of the cowl I'd like to see those too, so post some if you can.

Tim

Oosiksmith

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The cockpit panels have been done for months but I didn't get around to installing them until yesterday. I'm actually glad I procrastinated because the panels started to distort quite a bit around thier edges. I medium CA'd the panels to 1/16 balsa sheeting and now there are no problems. Some five-minute epoxy and CA and the panels are now permanent.

I made a cockpit floor out of 1/16 balsa with basswood stringers for strength and to keep the balsa from warping when I glassed the upper surface. I'll add the metal rudder kickplates later.

Oosiksmith

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The seem from the fuselage mold was slightly noticable along the top of the cowling so I put some filler in it and primed it. Some light sanding later and it should be unnoticable after the FM goes on.

Also, I finished the seat armor and made a bracket for the seat out of balsa planks and a piece of ply. The seat will be removable with two bolts so it will be easier to strap the pilot in and out, so I made the bottom out of ply for strength.


All the extra crap on my workbench means my son has been building his planes and painting them; you can see the red and blue planes and all his mess all over my bench...I wouldn't have it any other way.

TeamMuir1

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I like the cockpit,
I didnt have that option with my P-51 lol
I bought mine second hand and the canopy was
already glued on so I have left it, but If I were to order
another canopy I would like to do what you have done
there ... its nice looking.
I am wondering What cockpit kit was this?
Top Flight?

Oosiksmith

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Back on page three, post 65 I posted pictures of the cockpit kit. I got it from the same guy who sells FliteMetal. Its a basic kit and wasn't too expensive. I might still have the link to the website I ordered it from.

Oosiksmith

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I made another part of the cockpit tonight. I looked at several pictures of the cockpit floor of a real P-51 and decided I had to make the metal track that goes down the center of the cockpit floor from the seat to the control panel.

I made a pattern out of paper, transferred it to a sheet of metal, cut it out then folded up the sides to form a lip. A little primer and paint, then light scuffing and it ought to do the trick.

mimoore67

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Oosiksmith,

Hey, thanks for the pictures. Okay, your gear looks the best, as far as location of any of the ARF's on these threads. Now, to make it perfect, I'm thinking that we need to lengthen the gear legs about 1/2 inch, to make up that inch. Sound about right? Now, I'll just need to get some measurements off the full size Mustang to see if we're close.

Another important factor, is the actual stance of the airplane on the ground. Many times, Mustangs ARF, look like "DOGS" our freaking Dachshunds with their to short gear! Ooskismith, your plane looks very close from the other pictures in this thread.


Inner Gear Doors - The bane of all P-51 Mustangs in RC! My thought is that we could mount the servo (micro) in front of the spar, near the root rib, horizontally, and then run a ball link, to the gear door, and then use some sort of gear sequencer, that available on the market! I'll try and draw up some pictures tomorrow. Off to bed for me!

Cockpit - Great Pictures, they speak 1,000,000,000 words! I'm excited, but this is going to be a long process for me. This weeks goal, clean off the workbench, finish the H-9 Cessna 182, fly it this summer, and start working on this plane by end of June! Ambitious goal, with two kids and a WIFE!

mimoore67

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Picture One

I found this picture during a search of the threads for "Gear Doors." Obviously this is a P-47, but the builder here used a servo with a short linkage to actuate the door.


Picture Two
Again a really good example that I found, this will probably what I will base my gear door design around.

Picture Three
Just shows what it should look like when your done! The gear leg doors, show a simple linkage design, the trick will figuring out a way to secure the upper part of the gear door to the wing, so as not to interfere the retract and move with the gear as it retracts.

Picture Four
A good shot of the spacing of the gear doors. Also here's the link to a good sites for pictures and information!

Daddy's Girl
http://midwestaero.com/articles/daddysgirl.pdf

mimoore67

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My Stang is on the truck and will be waiting for me when I get home!!!!! I think I'll strip off the wing covering tonight!!!

Oosiksmith

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I'm not going to be worrying about the wing or gear doors for a little while. Instead of getting landing gear extensions you can probably talk directly to the guys at CJ and get them to make you slightly longer gear legs.

An Australian named Dave (goes by Ticketec on RCU) built a nice P-51 and came up with a good way to use a single servo to actuate his gear doors. He said it was a little bit of a pain to do and mentioned if he knew how hard it was going to be he'd probably have gone with an air system for the doors. I don't know what I'll use yet. Below are some pictures of Dave's method.

TeamMuir1

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OK... in this last pic. the landing gear are backwards....????
you all put alot a time into it looking Scale.... but in reality
this landing gear isnt SCALE... the wheels face are pointing
in the wrong direction!!!!

Oosiksmith

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Thats a well known issue to P-51 builders. The picture I posted was a trial fit of the gear and Dave swapped them around after (see post 5 in http://www.rcuniverse.com/forum/m_62...tm.htm#6269442 ). Minor issue, but some kits' wings are too narrow for the gear to fit the correct way, so they have to be reversed to get it all to go inside the wing.

If you want complete scale its probably better to start with a more expensive kit than the CMP one....you'll never be satisfied. I used that particular picture because it showed the connections to the gear doors well.

TeamMuir1

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Thanks !!! for the reply.
Your final assembly looks Great.
and You did get the wheels on correctly LOL.
your right some Wings are not thick enough.
so why spend the time to get alot of other things
correct..and spend all that time when some things
are not correct... so there we have the FUN SCALE CLASS.
I have so many planes that fit into that catagory.
and honestly I have alot a fun building and flying those
planes.
When I bought my P-51 it was second hand. the nose had a
WHOLE in the top the guy was going to put a Gas motor in it.
so I had some body work to do.
one of the reasons that I bought it so cheap too lol..
I LOVE the way my Bird fly's

Oosiksmith

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How big a cooling hole did you put in the bottom of the cowl? Can you post a picture?

TeamMuir1

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Oosiksmith

My cowl is cut out for the SAITO 150 GK
not much was taken off.. only the area that was needed....
then on the side I copied the scale look.
in order to get the same size holes I used a Dremel tool bit. that size.

martys40s

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Do you work on the ground or do you have a stand?

mimoore67

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Well, the other day, when I got home, I had a box from www.ak-models.com , however, it was the wrong Mustang. A simple call to Alex at AK-Models and the correct was shipped right out, via Fed-Ex. So those of you are looking for a Good Vendor, then I say use AK-Models. Alex has always answered E-Mails, answered the phone and replaced any damaged parts that's I've had. This is my second purchase from him, and this won't be my last! Reason for saying this, there seems to be a few vendors out there, but sometimes they can be difficult to deal with, or hard to get a hold off!

Okay, just inspecting my Mustang this afternoon. I'll strip off the covering on the wing and tail feathers and then clean up the building table. Now to only find time to work on my birds. I'll try late at night!!!!


Retracts - I know Oosiksmith is using CJ's and I have a set of CJ's that I had them put together for another kit, but didn't end up using, so I thought I might be able to contact them and see if I could get a credit toward the purchase of a new set! However, I think that will be a while off, as I will be making the gear legs longer and using a 4" wheels, so that actual dimension has still be determined!

This is nice looking Mustang and with some modifications, just like Oosiksmith, I can finally have my Mustang! I think if there was any real warbird, I could actually fly, it would have to be a Mustang! Unfortunately with the price of AV Gas, you'd have to be independently wealthy just put the gas tanks, let alone own one outright!

Oosiksmith

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Tinkered with the cockpit a little more. Added the restraints to the seat, floor kick-plates, and the joystick. Like the rest of the cockpit, most of the detail parts are made from bit and pieces I have laying around my workbench.

Oosiksmith

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With the extra weight I want to make sure I use a strong enough engine. I think this plane was designed around a YS 1.40, but with the mods I went to my LHS today and looked at the Saito 150 and 180. Impressive engines and they slid right in to the plane easily. Theres no question about Saito reliability or power, but glow fuel costs vs. gas made me check out the Evo 26GT. It also looks like it would go right in without too many major mods to the plane.

Will the Evo 26GT or the 26GX be enough engine to fly my plane with the mods I've done? Any help before I make an engine decision would be great.

ticketec

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At first glance at the pic's i thought, nice doors until i realise they were mine that pic hides things nicely....

Every one but me picked up the gear legs are the wrong way around when i took the pic's!!! your right, i was fixed straight after the pic's were taken..

As for the door actuation. i have an UP2 valve here on my bench for my Pica Mustang, but i am still tempted to use in the TF 'stang. the main reason is the robarts i have installed in that model sag a whole heap. so the gear door servo is working hard to try and keep the doors closed in flight. even though i set it up so that the doors in full up position centers the servo and so reduces the load, there is still a fair bit of load on it. the Jomar gear door sequencer is also a pain to setup but works fine once done.

So the short version of the story is, if your mains work fine and your gear doors sit comfortably in the up position then one servo is fine. if you mains sag, stear clear and go with air. I hope this info is helpful for you.

Thanks

dave

p.s. that cockpit looks awesome, you guys are doing a great job with this ARF.

Oosiksmith

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Dave,

Thanks for the advice and the compliment. You set the CMP ARF bashing bar pretty darn high with your 190. Rest assured, there are a lot of us waiting to see what you do with the new 109 so we can steal your ideas.

Tim

Oosiksmith

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Some videos of this plane with different engine set-ups. The last one is the same one I posted on the first page of this thread. The music on some of these is really, really bad.

http://www.youtube.com/watch?v=aEnAR...eature=related

http://www.youtube.com/watch?v=coEPKzC7QIs

http://www.youtube.com/watch?v=t61Nb...eature=related

http://www.youtube.com/watch?v=5_Gi8...eature=related

Oosiksmith

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I built the radio bay this weekend. First, I built two balsa boxes and glassed them. Getting the right size was tricky...I couldn't find any good pictures of the radio bay on the internet. I added detail parts from plastic and metal, then primed, painted, and dry-brushed them. Next, the radio rack was made from brass angel-iron from a toy train store and some basswood. Primed and painted them too. Next, I guess, is to figure out how to make the canopy slides.

Oosiksmith

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Holy crap....why are those pictures so big? I didn't load them any differently than I normally do.