Canadian Flag Blowing In The Wind Ron Leclerc Zenith CH701 Construction Log


Zenair CH701 STOL Aircraft...
CH701 STOL

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701 Horizontal Stabilizer Forming Blocks!

See the New 701 Stabilizer Design below... Elevator is also redesigned!


Click for larger view...

May 12, 2007
Horizontal Stabilizer Forming Blocks

 

 
701 Horizontal Stabilizer Parts!

The length of the Stabilizer and rear spar has been increased by 218mm(8.59") from 2220mm(7.28') to a full length of 2438mm(8.00')... based on the original wing/stabilizer design width ratio of 3.7241! The front spar length has been also increased from 1220mm to the full length of 2438mm also. The spar doublers were also increased in length from 1220mm to 1420mm. The 2, 7H1-2 Stabilizer Full Ribs were eliminated... thus the addition of 3 more nose ribs and 2 more rear ribs and the full length front spar. This follows the new CH750 Stabilizer and Elevator design...

Click for larger view...

February 15, 2009
7H1-1 Horizontal Stabilizer Tip Rib Blanks and Pattern - 2 required. (1L & 1R) 0.025...

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February 15, 2009
7H1-3 Horizontal Stabilizer Nose Rib Blanks and Pattern - 4 required (2L & 2R) 0.016...

Click for larger view...

February 15, 2009
7H1-4 Horizontal Stabilizer Rear Rib Blanks and Pattern - 4 required (2L & 2R) 0.016...

 

 
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February 16, 2009
7H1-1 Horizontal Stabilizer Tip Ribs Finished - 2 required. (1L & 1R) 0.025...

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February 16, 2009
7H1-3 Horizontal Stabilizer Nose Ribs Finished - 4 required (2L & 2R) 0.016...

Click for larger view...

February 16, 2009
7H1-4 Horizontal Stabilizer Rear Ribs Finished - 4 required (2L & 2R) 0.016...

 
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March 7, 2009
Hinge Brackets & Plates
7H3-1 Outboard Hinge Plates - 0.063 (2 req.)
7H3-3SP Center Hinge Bracket - 0.090 (1 req.)
7H5-4 Center Hinge Gusset - 0.040 (1 req.)

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March 7, 2009
7H2-7 Rear Bracket Blank 0.063...
Pattern

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March 7, 2009
7H2-7 Rear Bracket - ready for trimming 0.063...

 

 
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March 7, 2009
Front & Rear Brackets... ready for trimming
7H2-6 Front Brackets - 0.063 (2 req.)
7H2-7 Rear Bracket - 0.063 (1 req.)

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March 8, 2009
Front & Rear Brackets Parts - finished...
7H2-6 Front Brackets - 0.063 (2 req.)
7H2-7 Rear Bracket - 0.063 (1 req.)

 

 
701 New Modified Horizontal Stabilizer!

This modification is in response to some changes made to a 701 in Australia by - JG of StolSpeed Aerodynamics! JG and his partner Hans acquired the streamlined H. Stabilizer and Elevator from a damaged Savannah(701 clone) aircraft and installed them on Hans 701. Now Hans has over 800 flying hours on his stock 701 aircraft and was never satisfied with the low speed handling as compared to JG's Savannah... with the streamlined H. Stabilizer and Elevator. The Savannah has some features that make it a very stable flying aircraft at low speeds and also faster.

Now Hans tried to modify his 701 similar to the Savannah by going with the longer 29.50' wing, by adding VG's to the wing and also adding VG's to the leading edge of the elevator! All of these mods were very positive, but the low speed handling capabilities still presented a problem... so there was only one thing to do and that was to change the H. Stabilizer design to a more streamlined symmetrical design(not the inverted airfoil design like the 701) as compared to the Savannah. Well Hans got the chance to do this mod when a Savannah Stabilizer and Elevator became available. The H. Stabilizer and Elevator mounts onto the 701 very easy with a few mods since both the 701 and Savannah both evolved from the same design source. Check out how the 701(Chris Heintz) and Savannah(Max Tedesco) designs evolved and the paths each has taken by the designers!

 

 
New parts for the modification to include - Tip ribs, Nose Ribs, Rear Ribs,
front Spar and front brackets!

 
Click for larger view...

August 7, 2011
Patterns for the new Stabilizer Design... note the symmetric streamlined shape...

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August 7, 2011
New parts Forming Blocks - Nose Rib, Rear Rib and Tip Rib...

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August 7, 2011
Parts blanks for the Nose Rib and Rear Ribs - 0.020

 
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August 7, 2011
Parts blanks for the Nose Rib and Rear Ribs - 4 of each, 2 left and 2 right...

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August 7, 2011
Parts blanks for the Tip Ribs(0.025), Nose Ribs(0.020) and Rear Ribs(0.020)...

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August 7, 2011
Parts blanks setup for forming in the Forming Blocks...

 
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August 7, 2011
Photo showing the stock 701 Stabilizer Ribs(top) and the new symmetrical 701 Stabilizer Ribs(bottom)...

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August 7, 2011
Redesigned Stabilizer Ribs - Tip Rib, Nose Rib and Rear Rib. Skin Length is 740mm + 30mm + 770mm

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August 7, 2011
All of the redesigned Stabilizer Ribs - 2 Tip Ribs, 4 Nose Ribs and 4 Rear Ribs. The parts formed much better out of the 0.020 instead of the 0.016 as required by the stock 701 design... easier to work with and holds shape better!

 

 
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