RE: Anyone recognize this midget mustang?    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version

All Forums >> RC Airplanes >> Giant Scale Aircraft - General >> RE: Anyone recognize this midget mustang?
Page: <<   < prev  1 2 3 4 5 6 [7] 8   next >   >>  

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
RE: Anyone recognize this midget mustang? - 4/24/2012 3:08 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		Wow! Even I can build a wing with a drawing like that. That's great.

Hide Signatures

(in reply to All Day Dan)
       Post #: 151

RE: Anyone recognize this midget mustang? - 4/24/2012 5:13 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Hi Steve, here’s where we are so far. You confirmed that the airfoil I sent you is a good match. That’s the one in the middle on top. Its chord length is 22.125 inches. That exists six inches from the dihedral joint. We also determined before that a wing panel of 47 inches and a wing tip of 13 inches is close to scale and probably the original wing because of the rules of the class. This information projects to the dihedral joint as a chord of 23.44 inches. You will have to trim off the excess to fit in the fuselage opening. I scaled the side chord down to the tip chord by a ratio of 13/21.125 and scaled the dihedral chord of 23.44/21.125 up to get the dihedral chord. The leading and trailing edges are one inch balsa. The aileron is also one inch balsa 1 ¾ inch wide. The wing sheeting is 3/32 inch. This is shown in the end views. Since the aileron ends at the side of the fuselage, it does not show up in the dihedral end view. Removing the balsa from the end views yields the template that will be used to cut the foam wing. The hatched portion by the leading edge is not part of the core. It is used for lead in of the wire. The scale type wing tip that is shown is carved from a block of balsa. Or, you can make a wing tip plate from 1/8 plywood to make life easier. I often use those as they help stop the slippage of the air stream off the tip adding a bit more lift. They also act as great skids. I have to add the cutout for the servo, servo leads and location of the center of gravity. By the way, is there any indication that a centering device was located in the fuselage to keep the wing centered? Dan.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 152

RE: Anyone recognize this midget mustang? - 4/24/2012 5:47 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		There doesn't seem to be any centering device in the fuselage. There's a picture on page 2 post # 28 that might help.

Hide Signatures

(in reply to All Day Dan)
       Post #: 153

RE: Anyone recognize this midget mustang? - 4/25/2012 5:28 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Steve, you will have to figure out some way to keep the wing centered. It will probably be the mounting screws that will do it. I have calculated the position of the CG as a percent of the mean aerodynamic chord. 27.5% is a good place to start for a wing like this. 30% is too far back and you may have to move it to 25% because of the small horizontal surfaces. I have placed one of my servos in the drawing. The one you are going to use is a little larger. Just make the cut out bigger to accommodate it but you will have to make sure you intercept the servo cable channel embedded in the core. I have shown what the templates look like at the ends of the wing. The alignment is perfect. I will print out a full size pattern and send it to you. Cut it out and give it a check with the fuselage. Dan.

Attachments
Click to see fullsize image.
Click for fullsize


_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 154

RE: Anyone recognize this midget mustang? - 4/25/2012 3:43 PM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		Ok Dan, sounds good. Do you think that with an aileron this long I should use two servoes per wing?

Hide Signatures

(in reply to All Day Dan)
       Post #: 155

RE: Anyone recognize this midget mustang? - 4/25/2012 4:55 PM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		That 100+ ounce servo should be plenty. The aileron will be supported with six of the large Sig hinges and will be one inch thich at the hinge line. It would be easy enough to add another servo though. Here are some more drawings. I'll send you some full size versions. Dan.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 156

RE: Anyone recognize this midget mustang? - 4/25/2012 6:14 PM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Hi Steve, Sam Parfitt just completed a Ziroli P-40 build on RCU. He used a DA85 for power and HS645 servos for the ailerons. That plane weighed more than 30 pounds. The Cosmic Wind will be about 30. You should be able to get along with your single servo very well. Look for some more Ziroli builds on RCU. I don't recall anyone putting two servos on an aileron. Dan.

http://www.rcuniverse.com/forum/m_10051974/mpage_1/key_/tm.htm

_____________________________

Dan

Hide Signatures

(in reply to All Day Dan)
       Post #: 157

RE: Anyone recognize this midget mustang? - 4/25/2012 9:47 PM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		I kinda thought that servo would do the job. I'm just looking for things to pay attention to since you're doing all the work right now. I feel like I'm on deck and the counts full. I'm up next! I'm looking forward to the next stage.

Hide Signatures

(in reply to All Day Dan)
       Post #: 158

RE: Anyone recognize this midget mustang? - 4/26/2012 3:44 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Get ready for some work. As soon as you get the prints I send you my work is done. I'm going to sit back and watch you build the wing. Of course I'll be giving you plenty of advice but like this project from the beginning, you're there and I'm here. Tape the wing sheets together and give it a sanity check with the fuselage. I never realized how immense this wing is until I printed it out. You'll need plenty of wood to get it covered. I'll try to get it in the mail tomorrow. I’ll also make up a list of the balsa you will have to order. Dan.

_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 159

RE: Anyone recognize this midget mustang? - 4/26/2012 4:13 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		A well deserved rest for you and my rest is over! I'm very grateful to you and I promise to make you proud. Maybe when it's built we can find a way to get you and me and this airplane at the same flying field for a weekend. I've been taking it easy on my RC purchases lately so that I could afford to finish this project without having to wait for funds so I'm ready to go. This has already been a fun journey and I'm anxious to move forward. See Ya, Steve

Hide Signatures

(in reply to All Day Dan)
       Post #: 160

RE: Anyone recognize this midget mustang? - 4/27/2012 3:17 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Hi Steve, the last and final bit of design information is off to you today. Start counting your pennies. You will have to get a good deal of balsa. Probably more than any hobby shop would normally have. Here's the list:
wing sheeting: 4 1/2 sheets each layer. That's 18 for the wing. Get 24 3/32 X4 X48
LE, TE and aileron: 1 1/2 for each panel. That's 3 for the wing. Get 4 1X4X48
Wing tip: 1 1X4X48 for a balsa one or 1 1/8X12X24 plywood for a plate.

I have received some great stuff from balsa USA recently. If they don't have what you need, the nice lady on the phone will get it for you. The one inch balsa plank needs to be straight and of medium density. Dan.

Attachments
Click to see fullsize image.
Click for fullsize


_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 161

RE: Anyone recognize this midget mustang? - 4/28/2012 3:28 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		OK I understand the 24 pieces of 3/32X4X48 but do you really mean for me to get 5 pieces of 1X4X48 or was that a typo? I'm just not clear on what that's for. Am I going to make ailerons from this? I just want to be sure before I order. Thanks, Steve

Hide Signatures

(in reply to All Day Dan)
       Post #: 162

RE: Anyone recognize this midget mustang? - 4/28/2012 5:06 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Hi Steve, When you get the patterns you will be able to see what's going on. The ailerons are not part of the foam core. You will have to carve them from a plank of one inch balsa. Each one measures 1X1.75. That's one plank for both sides. The leading edge is 1X1.8 and the trailing edge is 1.3. That's one plank for one side and two for both. Get a spare plank. That's four. If you want balsa wing tips you will have to get another one and probably have to use some of the spare. Wait until the patterns arrive. Here are a couple of shots. They are from different planes. Dan.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 163

RE: Anyone recognize this midget mustang? - 4/28/2012 8:31 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		OK I think I get the picture now. That makes sense. I just gotta figure out how to cut the taper on the aileron and get both sides to come out even. I have a nice table saw with a real accurate fence. Maybe that will do it. I'll practice on some 2X4 balsa stock I have laying around. Thanks, Steve

Hide Signatures

(in reply to All Day Dan)
       Post #: 164

RE: Anyone recognize this midget mustang? - 4/28/2012 4:08 PM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Hi Steve, that table saw may cost you a finger or two with such a small, long piece. As you can see, the cross section of the aileron at the side of the fuselage and the tip is different. The best way to get the shape is have a good piece of balsa, a fresh number 26 blade, a sanding block and start carving your *ss off. Do a good job and make Michael Angelo proud of you. You will also have to carefully reduce the trailing edge to around 1/8 to 3/16 width. What is shown there is the theoretical thickness which is too much. Dan.

Attachments
Click to see fullsize image.
Click for fullsize


_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 165

RE: Anyone recognize this midget mustang? - 4/28/2012 8:33 PM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		I better keep all my fingers huh! I'll try my best at whittling then!

Hide Signatures

(in reply to All Day Dan)
       Post #: 166

RE: Anyone recognize this midget mustang? - 5/1/2012 4:20 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		Hi Dan, I got your drawings today and I am very impressed. Should I just get in touch with the foamcutters and make arrangements to ship this package to them or do I need to make plywood templates of the tip and dihedral airfoils and send those? Steve

Hide Signatures

(in reply to All Day Dan)
       Post #: 167

RE: Anyone recognize this midget mustang? - 5/1/2012 5:17 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Great news that you got it. Tape the wing parts together. Cut out the wing and make sure it fits in the fuselage as we thought. Other than that does it look right? I know it's not scientific but it will provide us with a cozy feeling to proceed. Foam wing cutting has progressed beyond the use of templates. A CNC machine now guides the cutting bow across the foam. All you need it the data file for the template. I have the files for the templates in my computer and I will email them to you. RCU does not support .dwg files. Double check the location of the CG using this website:
http://www.geistware.com/rcmodeling/cg_calc.htm#mac
I used something different. I'll send you the rest of the information tomorrow. Dan.

_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 168

RE: Anyone recognize this midget mustang? - 5/2/2012 12:40 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Steve, how does the wing fit? Does it look all right? Good. It's time to do some ordering. I get my wings cut at www.flyingfoam.com. The owners name is Bob Mellon. He needs the root and tip templates and the panel dimensions. I have that information on an AutoCad drawing that I have duplicated here in a .jpg format. I will email it to you in an AutoCad .dwg drawing. You won’t be able to read it because you don't have AutoCad. I did one more final check of the templates and you can see that they line up perfectly. Get a quote from Bob for the cores. One pound density is the foam that you want. Dan.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Dan

Hide Signatures

(in reply to All Day Dan)
       Post #: 169

RE: Anyone recognize this midget mustang? - 5/2/2012 3:41 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		Sorry Dan, I wasn't able to get to the wing last night. I've taped it up and checked it to the fuselage. I'm pretty sure this is going to be a good fit. There is a 3/16" gap at the trailing edge in the saddle but I think it's safe to go with. The drawing measures 22" even. It can be taken up with a little extra trailing edge or just filled in afterwards. The wing will fit and I believe it will be easy to get zero degrees angle of incidence. I haven't double checked the CG yet on that website you gave me but I'll give it a shot later. Tomorrow I'll get in touch with Bob and set things in motion for the cores. Steve

Hide Signatures

(in reply to All Day Dan)
       Post #: 170

RE: Anyone recognize this midget mustang? - 5/2/2012 4:04 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		I just forwarded the email you sent me to Bob. He should have all he needs to get me a quote.

Hide Signatures

(in reply to All Day Dan)
       Post #: 171

RE: Anyone recognize this midget mustang? - 5/2/2012 4:07 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		OK. It looks like everything is coming together just right. Dan.

_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 172

RE: Anyone recognize this midget mustang? - 5/2/2012 4:26 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		OK I checked the CG and here's what I got: 25.16% @ 4.5" 27.96% @ 5" 30.75% @ 5.5"
I'm not sure I did it right. I don't understand how this tells me where the CG is. Maybe I'm just dense. Up til now I've just gone by what is in the directions that come with the ARF or kit. This is a chance for me to learn how that measurement is calculated but I'm not there yet. Steve

Hide Signatures

(in reply to All Day Dan)
       Post #: 173

RE: Anyone recognize this midget mustang? - 5/3/2012 4:10 AM   
All Day Dan


 

Posts: 2889
Score: 151
Joined: 12/15/2002
Last Login: 5/18/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Steve, the center of gravity is the point where the entire weight of a plane can be assumed to be located. It has to be located at a certain spot to sustain stable flight. That spot is determined by the nose moment, tail moment, airfoil, shape and area of the wing, shape and area of the empennage and a few dozen other things. For modeling purposes, the shape and area of the wing is close enough. The location of the CG is usually expressed in a percent of the Mean Aerodynamic Chord of the wing. That distance is behind the leading edge of the wing. The MAC is from a rectangular representation of any wing’s shape. So, all you need to know is what the MAC is. It used to take some geometry to figure it out but now-a-days we use computers like that website I sent you to. We know, from lots of past experience that from 25% to 30% of the MAC behind the leading edge of the wing will yield a stable flying model airplane. For a light model with a constant chord wing, 30% is good. For a heavy war bird with a highly tapered wing, 25% is all right. The Cosmic Wind is right in the middle. It has a tapered wing but is not so heavy. Therefore 27.5% should be right. I replied to Bob about what’s going on. I am sure he’s shaking his head in amazement about what we did but there is no other way except to start cutting up the fuselage. Dan.

_____________________________

Dan

Hide Signatures

(in reply to cowmags)
       Post #: 174

RE: Anyone recognize this midget mustang? - 5/3/2012 5:29 AM   
cowmags


 

Posts: 95
Score: 101
Joined: 1/5/2007
Last Login: 5/18/2013
From: Fruita, CO, USA
Status: offline 		Well it looks like my figures are fairly close to yours so does that mean that our CG will be at 5" from the leading edge? Thanks for responding to Bob, by the time I saw the email you had already responded. Not that I could have answered him near as well as you! I have to say that learning this stuff is fun. I can't say I'll be a seasoned veteran after this first build but I'll be a lot more knowledgeable than I was. I'm so close on my Giant Aeromaster that I'm taking Friday off so that I can get it finished this weekend.

Hide Signatures

(in reply to All Day Dan)
       Post #: 175

Page:   <<   < prev  1 2 3 4 5 6 [7] 8   next >   >>  
All Forums >> RC Airplanes >> Giant Scale Aircraft - General >> RE: Anyone recognize this midget mustang?
Page: <<   < prev  1 2 3 4 5 6 [7] 8   next >   >>  




Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


0.797RCU1