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


Zenair CH701 STOL Aircraft...
CH701 STOL

Winnipeg

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Wing Parts Continued:

701 Modified Nose Ribs
To prevent abrupt stalls there are some mods that can be done with the nose rib to alleviate the problem! Now Zenith used the NACA 65018 wing form for the 701 wing with mods to the nose rib! They cut a slot in the nose rib and developed a slat with the hole between slat and new blunt nose rib! this mod allowed the wing to stall at higher angles of attach!

Chris Heintz indicated in his design handbook that there are 3 ways that can be used for Stall control... and are as follows!

1) Now adding slats to the nose ribs... the method Zenith used is not the only way to prevent abrupt stalls, there are 2 other much easier methods that can work equally as well!

2) We can use the full length of the NACA 65018 wing design or just the blunt nose rib without the Slats... and add VG's at some distance from the Leading Edge! Very easy to do... no VG's or Slats needed!

3) The Naca 65018 rib can be designed with a Drooping Nose at the Leading Edge! Also very easy to do... no VG's or Slats needed!

Now which method is best?

This is the NACA wing plan that Zenith has used for the 701! It should also be noted that this wing plan was also the basis for the Savannah wing with Slats and Savannah VG wing!
naca 65018 wing rib...
 

701/750 Stock Nose Rib!

Click for larger view...

June 11, 2013
701/750 Stock Nose Rib forming blocks... modified from the NACA 65018 wing plan! Used with the Leading edge Slats!

Click for larger view...

June 11, 2013
Works very for STOL, but there is lots of drag... now these nose ribs have also been used without the slats, with added VG's for STOL and slow speed handling! They work much better with the VG's with the blunt nose adding to the STOL! The Slats add to the difficulty in building this wing. They also add 14 lb to the wing...

 
701/750 Long Nose Rib!(Like the new 750 CruZer)

Click for larger view...

June 11, 2013
Long nose rib pattern! This rib is a very easy wing to build... can also add the VG's for STOL capabilities!

Click for larger view...

June 11, 2013
Long nose rib forming block! Now keep in mind that the blunt nose rib was designed for the 701 with only the 912 engine... no other engine was given consideration. Now the Long nose rib presents a small problem with the Rotax 912... too much rear CG, need some weight in the nose! This Long nose rib will work well with heavier engines like the 0-200 types, or VW Type 4!

 
701/750 Drooped Nose Rib!

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June 11, 2013
New drooped Nose Rib pattern!

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June 11, 2013
Drooped Nose Rib forming block... 50mm added to the NACA 65018 wing plan with the droop 20mm down from the rib bottom!

 
So which method is best???

After reviewing all 3 methods... the slats look good are effective and impressive and is always a talking point, but very difficult to make(lots of small pieces), but it appears that the long nose rib with added VG's or the new drooped nose rib would be the best! The long rib with added VG's... extra cost, but good for heavier engines! The drooped nose rib is the simplest and best for heavier engines also... keeps the CG in nose heavy, not tail heavy! I decided to go with the drooped nose ribs! Not that difficult to make, does not need VG's... adds imcreased speed, low speed capabilities, redruced stall speeds etc! For more info on drooped nose ribs check out - Sportsman STOL
 
701/750 Drooped Nose Rib Parts!

Click for larger view...

June 13, 2013
Drooped nose rib blanks! 0.025 6061 T6 aluminum! Had some concern with forming the bottom curved surface... but there was no problem worked out well, no different then other surfaces!

Click for larger view...

June 14, 2013
New Drooped Nose Rib! 0.025 6961 T6 - 7 left and 7 right req! Nose skin measurement is 960mm + 36mm... top to the nose bend is 527mm, the bottom to the nose bend is 433mm!

Click for larger view...

June 26, 2013
New Drooped Nose Rib! 0.025 6061 T6 - 7 left and 7 right req...

 
701/750 Root Nose Rib Parts!

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June 13, 2013
Root Nose Ribs! 0.025 6061 T6 aluminum! 2 required

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June 14, 2013
Root Nose Rib forming block!

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June 11, 2013
Root Nose Rib Pattern!

 
Click for larger view...

June 13, 2013
Root Nose Rib blanks! 0.025 6061 T6 aluminum! 1 left and 1 right

 

 
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