Scratch Building, Aircraft Design, 3D/CAD If you are starting/building a project from scratch or want to discuss design, CAD or even share 3D design images this is the place. Q&A's.

162" Art Scholl Super Chipmunk

Reply
Old 09-19-2010, 07:57 PM
  #1
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 162" Art Scholl Super Chipmunk

Hey Guys, Well I've been gathering info for sometime now. I have decided it was time to start the build. This build will be a slow one, as I'm still needing a few things.

This is my first scratch build and the first time I've ever worked from enlarged plans. The plans are the old Ohio RC plans (81") that where doubled. Power will be a DA-150 with cans if they can be made to fit. 12 servos should do the job. I will also have smoke. I'm estimating the weight around 60lbs.

I will be making a few mods from the plans. I'm not trying for perfect scale just going to try and get rid of the Sport scale look of the plans. The wings will be built as is. I've talked with several builders that say the wing is a good airfoil. I will be making it a three peice wing though. It will break at the ailerons.

The fuse will be rounded out. The Ohio kit had very flat sides and no wing fillets.

The first pic is of the main spar. It is two 1/4"x48" plywood.

Second is of the bottom spar. I cut a groove in it with my table saw. This will make the shearwebs stronger.

Pic three is of the lightning hole cut in to a 1/8" ply rib. There are only five of these.

Pics 4 and 5 are of the wing tube holes.

And finally the wing test fitted together. No Glue yet.

That is a 36" yard stick laying on the wing.

More pix later.
Kelly
Attached Thumbnails
Click image for larger version

Name:	Nk27949.jpg
Views:	88
Size:	93.2 KB
ID:	1503735   Click image for larger version

Name:	To43105.jpg
Views:	112
Size:	114.0 KB
ID:	1503736   Click image for larger version

Name:	Pu52302.jpg
Views:	92
Size:	112.3 KB
ID:	1503737   Click image for larger version

Name:	Uo36640.jpg
Views:	90
Size:	89.3 KB
ID:	1503738   Click image for larger version

Name:	Se45633.jpg
Views:	78
Size:	71.0 KB
ID:	1503739   Click image for larger version

Name:	Yw69184.jpg
Views:	90
Size:	119.5 KB
ID:	1503740   Click image for larger version

Name:	Xs57915.jpg
Views:	94
Size:	128.2 KB
ID:	1503741  
Thunderbolt47 is offline  
Reply With Quote
Old 09-19-2010, 08:46 PM
  #2
Desertlakesflying
 
Join Date: Jul 2005
Location: Sun Valley, NV
Posts: 2,239
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Oh I have to subscribe to this one.
Desertlakesflying is offline  
Reply With Quote
Old 09-19-2010, 09:34 PM
  #3
jim52519
 
Join Date: Apr 2005
Location: , IL
Posts: 157
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Kelly,
It looks good! It is larger than I thought it would be. I will be very interested in what you do with the fuselage.
Jim
jim52519 is offline  
Reply With Quote
Old 09-19-2010, 10:52 PM
  #4
jrbmoto
 
Join Date: Feb 2005
Location: Glendora, CA
Posts: 509
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Beautiful!.....Looks like fun, cant wait for more pics!

-Johnny-
jrbmoto is offline  
Reply With Quote
Old 09-20-2010, 07:14 PM
  #5
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Well today I got the rings doublers made and installed the right inner panel tube. I made a 1/8" ply pattern and used my router to cut out 4 at a time.

I'm using Titebond III. This seems to be some pretty good glue.

Later,
Kelly
Attached Thumbnails
Click image for larger version

Name:	Rp43249.jpg
Views:	52
Size:	156.8 KB
ID:	1504369   Click image for larger version

Name:	Id96610.jpg
Views:	56
Size:	116.5 KB
ID:	1504370   Click image for larger version

Name:	Bg93122.jpg
Views:	60
Size:	138.9 KB
ID:	1504371   Click image for larger version

Name:	Un34060.jpg
Views:	68
Size:	115.4 KB
ID:	1504372   Click image for larger version

Name:	Cn79227.jpg
Views:	73
Size:	142.8 KB
ID:	1504373  
Thunderbolt47 is offline  
Reply With Quote
Old 09-21-2010, 05:29 PM
  #6
flyguy
 
Join Date: Jul 2002
Location: fuquay-varina, NC
Posts: 66
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

kelly those ribs look light with all of the lighting holes. Are you sure it will weigh sixty pounds?
flyguy is offline  
Reply With Quote
Old 09-21-2010, 07:29 PM
  #7
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Hey Rick, I'm just guessing.[8D] It will be fully sheeted and glassed with paint. I'll say 60 so that way if it is lighter, that will be a plus. It will still have good performance even at 60lbs.

I have been weighing all the pieces that have been lightened. So far I've saved about 2.5 lbs. Most of that was plywood weight. Now I'm in the lite ply pieces, so there won't be much weight to lose.
Today I lightened some of the lite-ply ribs. So far on rib 7 I saved 1.2 ozs and on 8 about 1.5.( for both wing panels) As long as I can see a meaningful weight reduction, I will lighten more of the lite-ply ribs.

Later,
Kelly
Thunderbolt47 is offline  
Reply With Quote
Old 09-22-2010, 09:01 PM
  #8
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

OK here todays progress.

I finally lightened all the ribs. In all I removed a 1/2 lb. That is for both wing panels. Didn't cut number 14. Every little bit adds up.

I have the lite-ply shear webs cut and they lock in place tight. Tomorrow after I sleep on it some, it will get some glue.

I did have to replace the inner rib 6. (that's the break) It was off just a tad. Didn't want it to bite me later. After some careful measuring I saw it was off more than I thought. Got to be more careful.[&o]

Later
Kelly
Attached Thumbnails
Click image for larger version

Name:	Kh17707.jpg
Views:	59
Size:	135.4 KB
ID:	1505480   Click image for larger version

Name:	Gb90830.jpg
Views:	60
Size:	113.6 KB
ID:	1505481   Click image for larger version

Name:	Rw57831.jpg
Views:	67
Size:	137.8 KB
ID:	1505482   Click image for larger version

Name:	Un34679.jpg
Views:	60
Size:	133.7 KB
ID:	1505483  
Thunderbolt47 is offline  
Reply With Quote
Old 09-26-2010, 12:40 AM
  #9
rgunder
 
Join Date: Jul 2005
Location: San Marcos, CA
Posts: 253
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Wow! Very impressive Kelly. I can't wait to see it complete. You say this is your first scratch build?
rgunder is offline  
Reply With Quote
Old 09-26-2010, 07:23 PM
  #10
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

OK hear's a photo flood. Got a lot done this weekend. I not going to give a blow by blow on this build, but if you see anything that raises a question, fill free to ask.

Kelly
Attached Thumbnails
Click image for larger version

Name:	Hf99121.jpg
Views:	61
Size:	133.0 KB
ID:	1507225   Click image for larger version

Name:	Sn42455.jpg
Views:	58
Size:	133.7 KB
ID:	1507226   Click image for larger version

Name:	Fk16120.jpg
Views:	63
Size:	130.8 KB
ID:	1507227   Click image for larger version

Name:	Ey70961.jpg
Views:	64
Size:	126.8 KB
ID:	1507228   Click image for larger version

Name:	Vg54583.jpg
Views:	61
Size:	121.0 KB
ID:	1507229   Click image for larger version

Name:	Xo88639.jpg
Views:	62
Size:	122.6 KB
ID:	1507230   Click image for larger version

Name:	Fh82238.jpg
Views:	64
Size:	82.1 KB
ID:	1507231   Click image for larger version

Name:	Hg22353.jpg
Views:	64
Size:	120.2 KB
ID:	1507232  

Click image for larger version

Name:	Fd62950.jpg
Views:	68
Size:	132.6 KB
ID:	1507233   Click image for larger version

Name:	Rd32568.jpg
Views:	72
Size:	132.2 KB
ID:	1507234   Click image for larger version

Name:	Io65451.jpg
Views:	67
Size:	113.5 KB
ID:	1507235   Click image for larger version

Name:	Al51907.jpg
Views:	61
Size:	105.3 KB
ID:	1507236  
Thunderbolt47 is offline  
Reply With Quote
Old 09-26-2010, 07:28 PM
  #11
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

few more.
Attached Thumbnails
Click image for larger version

Name:	Jh16512.jpg
Views:	48
Size:	102.6 KB
ID:	1507241   Click image for larger version

Name:	Rm36222.jpg
Views:	54
Size:	108.0 KB
ID:	1507242   Click image for larger version

Name:	Gl21103.jpg
Views:	52
Size:	149.5 KB
ID:	1507243   Click image for larger version

Name:	Cw64464.jpg
Views:	51
Size:	116.3 KB
ID:	1507244   Click image for larger version

Name:	Qb36868.jpg
Views:	61
Size:	142.5 KB
ID:	1507245   Click image for larger version

Name:	Tk76533.jpg
Views:	49
Size:	128.7 KB
ID:	1507246   Click image for larger version

Name:	Fh79732.jpg
Views:	52
Size:	150.0 KB
ID:	1507247  
Thunderbolt47 is offline  
Reply With Quote
Old 09-26-2010, 07:35 PM
  #12
All Day Dan
 
All Day Dan's Avatar
 
Join Date: Dec 2002
Location: MANHATTAN BEACH, CA
Posts: 4,413
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Great job Kelly. What type of glue are you using to sheet the wing with? Usually, the water based glues set up too fast. Dan.
All Day Dan is online now  
Reply With Quote
Old 09-26-2010, 07:48 PM
  #13
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

I'm using titebond III. It seems to be work great and gives me a few minutes to get everything right.

Thunderbolt47 is offline  
Reply With Quote
Old 09-26-2010, 08:17 PM
  #14
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162


Quote:
ORIGINAL: rgunder

Wow! Very impressive Kelly. I can't wait to see it complete. You say this is your first scratch build?
Yes Rgunder, This is my first scratch build. I wanted something noone else had.
Thunderbolt47 is offline  
Reply With Quote
Old 09-28-2010, 08:30 PM
  #15
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Ok, I've been working on the left wing panel for the last few days, This is kind of like a re-run

I will post a few pics of how I make up my wing skins. MAybe this will be helpfull to someone. I learned this from Jack Devine's website years ago.

I don't trim my sheets. Most of the time you can turn the bow the same way and get a tight joint. Use masking tape to hold the sheets together. Flip the sheet over and hang them off the edge of the table. Add the glue to the joint that's open and move it up one sheet. As you do this the sheets on the table will lye flat, squezzing the excess glue out. Them wipe the excess off with a towel. Let it sit for a few hours and you have wing skins.

A good friend of mine gave me a great tip. Sand the sheet joints smooth on the table, because it's easier and you get better results than sanding after it's applied.


Last couple of pics is of the wing assembled. The table it's on is 11 feet long.
Later,
Kelly

Attached Thumbnails
Click image for larger version

Name:	Db84818.jpg
Views:	55
Size:	89.5 KB
ID:	1508243   Click image for larger version

Name:	Pk31880.jpg
Views:	50
Size:	100.7 KB
ID:	1508244   Click image for larger version

Name:	Rw58166.jpg
Views:	53
Size:	87.9 KB
ID:	1508245   Click image for larger version

Name:	Sm29406.jpg
Views:	69
Size:	137.7 KB
ID:	1508246   Click image for larger version

Name:	Ny27972.jpg
Views:	96
Size:	121.5 KB
ID:	1508247  
Thunderbolt47 is offline  
Reply With Quote
Old 09-28-2010, 10:29 PM
  #16
BMatthews
Moderator
 
BMatthews's Avatar
 
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
Posts: 12,276
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Just when I think we're doomed to drown in a sea of ARF's someone like you comes along with a project like this. It's enough to restore one's faith in the human spirit!

Like the others I'll be watching along with intrest and enthusiasm.
BMatthews is offline  
Reply With Quote
Old 09-29-2010, 04:45 AM
  #17
flyguy
 
Join Date: Jul 2002
Location: fuquay-varina, NC
Posts: 66
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Looks like you need a larger table, and a larger shop.The wing is looking good.
flyguy is offline  
Reply With Quote
Old 09-29-2010, 04:59 AM
  #18
gene6029
 
gene6029's Avatar
 
Join Date: Sep 2007
Location: wilson, NC
Posts: 1,202
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Im following along w everyone too! I think this is a great project & look foreward to each post you make. Keep up the excellent work....Gene
gene6029 is offline  
Reply With Quote
Old 09-29-2010, 07:47 PM
  #19
R_G
 
R_G's Avatar
 
Join Date: Dec 2004
Location: Farrell, PA
Posts: 818
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Very nice build you've got going here Kelly! [sm=thumbs_up.gif] I especially like the fact that you're cutting out all of your own parts instead of using laser fried parts! Although they can be very accurate I don't care for the look of the burnt edges of laser cut wood!

Looking forward to seeing more progress!

RG
R_G is online now  
Reply With Quote
Old 09-29-2010, 08:51 PM
  #20
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Thanks for all the compliments guys. I'm having FUN!

Hey Flyguy, I added on to my table just for this build. I won't be able to put this plane together in my shop, But at least I won't have to tear a wall down to get it out. LOL

Later,
Kelly


Thunderbolt47 is offline  
Reply With Quote
Old 09-30-2010, 07:42 PM
  #21
winglift
 
Join Date: Aug 2002
Location: Worthington, IN
Posts: 373
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Wow! It looks like quite the project, very impressive so far. Keep up the good work. I was thinking about doing a scratch build myself and was wondering how you cut the ribs?
winglift is offline  
Reply With Quote
Old 10-01-2010, 08:47 PM
  #22
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Hey Winglift, Here is what I used to attach the templet to the wood. Just give it a light pass and it sticks pretty good. Seperation is easy and the adhesive isn't noticable on the wood afterwards. You can stack as many sheets as you need. I had to make two of each rib.

Also, 3M makes #77 spray and I found some really cheap stuff the other day for $4 a can but haven't tried it yet. I believe the NAPA spray was $10.

Hope this helps,
Kelly
Attached Thumbnails
Click image for larger version

Name:	Om33613.jpg
Views:	52
Size:	98.8 KB
ID:	1509632  
Thunderbolt47 is offline  
Reply With Quote
Old 10-01-2010, 09:19 PM
  #23
Thunderbolt47
Thread Starter
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Here is my motivation, It keeps me going


http://www.youtube.com/watch?v=A-kHTmYjBQk
Thunderbolt47 is offline  
Reply With Quote
Old 10-01-2010, 09:40 PM
  #24
jim52519
 
Join Date: Apr 2005
Location: , IL
Posts: 157
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

Kelly,
I too found this Art Scholl video inspiring! Art was quite a showman. I plan to start my 50 cc version of the Chippy next spring after I finish my Extra.
Jim
jim52519 is offline  
Reply With Quote
Old 10-03-2010, 01:13 AM
  #25
andrew66
 
andrew66's Avatar
 
Join Date: Jan 2006
Location: Brandon, MB, CANADA
Posts: 1,057
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 162

very nice work! One technique i was shown for making wing skins, is to join the sheets of balsa with contact cement. Works pretty good and is a fairly quick procedure providing that the sheets are all lined up and fitted properly.
andrew66 is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 08:05 PM.