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09-22-2019, 05:36 AM
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Join Date: Mar 2014
Location: Jekyll Island, GA
Posts: 56
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Fluting fuselage frames.
I'm somewhat stuck trying to figure out how to flute the fuselage frames to make the holes align. They do not sit flat so I assume some work is in order but I'm not sure how to go about it. Thanks in advance for any input...
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09-22-2019, 05:48 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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If you are referring to the bulkheads, lay them on a table with the flange up and lightly flute them between the rivet holes until it lays flat on the table.
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Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
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RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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09-22-2019, 10:09 AM
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Join Date: Sep 2006
Location: Windsor, California
Posts: 920
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After you have fluted the tail cone formers so that they lie flat on a table, be sure to tweak their circumferential flange angles so that they are reasonably aligned with the taper of the tail cone skins. The tail cone skins are based on a conical shape. Therefore the flanges of the tail cone formers should not be a simple 90-degree angle but should approximate the conic angle of the tail cone skins.
ps -- You may want to break-out your old geometry skills to fomally calculate these angles or find a local sixth-grader. 
__________________
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)! 
V AF donation through June 2021.
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09-22-2019, 10:18 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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What David said. Spend the time to tweak the angles to get a smooth finish once it’s riveted.
__________________
Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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