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Very Hot Topic (More than 25 Replies) Magna-Board Building Board Project (Read 4872 times)
Sky9pilot
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Re: Magna-Board Building Board Project
Reply #32 - Dec 15th, 2018 at 12:12pm
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For those who don't have the first page for the Gamma, here it is.
  

Northrop_Gamma_36in_oz6374.pdf ( 708 KB | 25 Downloads )

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alfakilo
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Re: Magna-Board Building Board Project
Reply #31 - Dec 15th, 2018 at 7:19am
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A very helpful HPA poster passed that link along to me too. The OZ website lists a supplemental page, but for some reason, I couldn't download that page.

Many thanks to Indoorflyer for his help!
  
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bigrip74
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Re: Magna-Board Building Board Project
Reply #30 - Dec 14th, 2018 at 11:58pm
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WOW! What a find Tom, thanks for the extra page I am now thinking of putting this plan on my to do list.

Bob
  

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Sky9pilot
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Re: Magna-Board Building Board Project
Reply #29 - Dec 14th, 2018 at 11:37pm
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Gentleman...I was just informed that the Pres Bruning plan has a second suppliment page to be downloaded with all the parts and ribs templates.
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Sky9pilot
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Re: Magna-Board Building Board Project
Reply #28 - Dec 13th, 2018 at 2:05pm
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Here's my repeat..."y'all have heard the joke about Pete and Repeat right?"  Repeat=The trick I use to align the saran wrap is to anchor one corner (usually top left or right with a magnet). Once you have one of the top corners anchored,  pull the saran wrap on that side straight down and smooth it flat over plan.  Then start at the opposite top side and smooth the saran wrap over the plan and anchor that corner with another magnet.  Then repeat as you did the opposite bottom.  This usually works for me.  As clean as your area is you'll have no problems with things getting under your saran wrap....don't ask  Roll Eyes Embarrassed I tend to set up board before cleaning area at times!!! Shocked Embarrassed Wink
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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bigrip74
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Re: Magna-Board Building Board Project
Reply #27 - Dec 13th, 2018 at 1:28pm
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OK! I just started my first magnaboard build. The saran wrap was a real pain to line up using the magnets Tongue. Any tips would be greatly appreciated. Cheesy

Bob
  

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Holicek_Me109_p1.jpg

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Sky9pilot
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Re: Magna-Board Building Board Project
Reply #26 - Dec 12th, 2018 at 1:13pm
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Thanks Mike...just want everyone to be aware of competition rules if they're gonna compete!! I appreciate the clarification! Smiley
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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MKelly
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Re: Magna-Board Building Board Project
Reply #25 - Dec 12th, 2018 at 1:06pm
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Tom and AK,

Airfoils don't have to be flat-bottom for FAC events.  The restriction (for FAC Scale) is that the model can't have undercambered airfoil unless the real aircraft had it.  For Dime Scale you can't have an undercambered airfoil or single-surface airfoil unless the model plan shows it.  Semi-symmetrical and symmetrical airfoils are allowed.

Cheers,

Mike
  
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alfakilo
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Re: Magna-Board Building Board Project
Reply #24 - Dec 12th, 2018 at 11:48am
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No problem! The ribs above were for the Brewster XSBA-1. I made the bottom flat, sorta like a Clark Y airfoil, more for building ease than anything else.
  
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Sky9pilot
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Re: Magna-Board Building Board Project
Reply #23 - Dec 12th, 2018 at 10:53am
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Great Alfakilo...
If you plan on competing in the future within FAC (Flying Aces Club) I believe the rules require flat bottomed airfoils, unless otherwise it's specified in old timer plans and rules for the event.  You'll want to check that before you plan to compete.  FYI
Sky9pilot
  

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Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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alfakilo
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Re: Magna-Board Building Board Project
Reply #22 - Dec 12th, 2018 at 8:16am
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Thanks, Tom! I use the same method you mentioned where I use the MSWord tool to adjust the rib chord to match the plan. Once the wing is built, I then use a ruler (or similar straight edge) to sand the ribs to final shape.

For example, in the attached picture, the largest rib was copied from a 3-view from the 'net using a screenshot utility, its chord was sized from the plan, and then it was pasted on to a .doc page. I then measured the chords of the other ribs and used the edge adjustment tool that you described to set their chord lengths. Then I made a second copy for the other wing panel and used rubber cement to stick them on a 1/32 sheet.
  

( 15 KB | 34 Downloads )
sba_ribs_2.jpg
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bigrip74
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Re: Magna-Board Building Board Project
Reply #21 - Dec 12th, 2018 at 12:01am
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Tom, stated the how on the Bruning plan and I also learned something. Maybe now I can tackle the Comet P-37.

Thanks Tom, that was really a big help.

Bob
  

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Sky9pilot
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Re: Magna-Board Building Board Project
Reply #20 - Dec 11th, 2018 at 10:50pm
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Pres' ribs are made using the root rib shown on the plans then the tip rib is extrapolated from from the root for length and then the other ribs can be made using the stack method.

The stack method(stack rectangular balsa strips the dimensions of the root rib, using the number of ribs needed, don't forget there's usually two panels requiring double ribs) is where a root rib template is made from plastic, metal sheet, plywood etc.  Then the tip template is made as the root template.  I recommend holes be made in the templates to hold "T-pins", small diameter screws and nuts etc. to hold the stack together while shaping the ribs from root to tip. 

Math not being my forte, I cheat and enlarge and shrink (as needed) till the proper size is arrived at using MSWord picture where I can grab a corner of the template picture with the cursor and drag to the necessary size using the ruler edges of MSWord to determine the size.  I will then double check on the printed plan to make sure I was accurate.

After all this wordage, here's a link that show how with pictures: Click Here
Tom
  

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Screenshot__1381_.jpg

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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alfakilo
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Re: Magna-Board Building Board Project
Reply #19 - Dec 11th, 2018 at 9:57pm
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The Gamma plan, for example. Box fuselage but no formers for the box. Wing ribs seem to be conventional but not shown.

https://outerzone.co.uk/plan_details.asp?ID=6374
  
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bigrip74
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Re: Magna-Board Building Board Project
Reply #18 - Dec 11th, 2018 at 9:39pm
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Which plan are you speaking of? Some have cracked rib construction.

Let me know which and Ill look them up to see what I find.

Bob
  

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