About this Plan
Veron Impala - Slope soarer trainer. Primary hillside soarer for 2 channel radio control on rudder and elevator only.
Quote: "The Impala is a balanced design capable of stable flights in all conditions. It has a flat undercambered section to give stable penetration and this coupled with a lifting section tailplane obviates 'ballooning up' in up or downwind situations. Also balanced side areas to move diagonally along a soaring ridge without 'weather-cocking' into wind and without the constant need for repeated corrective signals. Ample dihedral gives a high degree of inherent and self-corrective stability."
Direct submission to Outerzone.
Update 24/04/2015: Replaced this plan with a clearer version (less scanner creep), thanks to AugustaWest. Note there are some small differences between these two versions of the plan, eg previous version shows servos in fuselage elevation, this one shows an actuator. Also, this title block says 'Model Aircraft', where previous version says 'Veron'.
Update 22/05/2018: added kit review from RCM&E, November 1967, thanks to RFJ.
Supplementary file notes
Instructions, as supplied in the kit. 2 pages of text. Also, previous version of plan scan. Kit review.
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User commentsIf you build the Impala (and you should!) you need to make a full length 1/32 ply doubler for each of the fuselage sides (on the outside) otherwise the fuselage will definitely break on anything but the lightest of landings. The Impala flies well in force 4 to 5 winds.
CodysNeighbour - 28/07/2013
Hi Steve, I read on the Impala new plan that he states "It has a flat undercambered section" This is not possible. It should read flat wing section.It is like being round and square at the same time!! makes no sense. I'm sure you'll agree with me. Regards,
Eduardo - 25/04/2015
Yes, I agree. This is a direct quote from the printed kit instructions text, but I guess it was a mistake, and they meant to say 'flat bottomed section'
SteveWMD - 25/04/2015
Hi Steve, I'm probably not the first to comment on this, but the term 'flat ( bottomed) undercamber section' is perfectly correct. The lower surface does not have to be concave for the section to be undercambered. The camber line of an aerofoil is located equidistant between the upper and lower surface. If it is straight, the section is symmetrical. If it is curved downwards, it is undercambered. Flat bottomed sections like Clark Y are therefore undercambered. They are a 'special case' of undercambered aerofoils just like a square is a special case of quadrilaterals. Even a semi-symmetrical section is by definition undercambered ! Cheers !
ChrisPinn - 27/04/2015
Interesting. That's news to me. I guess common usage is then (strictly speaking) incorrect. Myself, I am very common and so I read 'undercambered' as meaning 'concave'. A quick check with Google image search suggests I am not alone.
SteveWMD - 27/04/2015
The technically correct description of the Impala's airfoil is a cambered airfoil section with a flat bottom. Anyone believing the terms "cambered" and "flat bottomed" to be somehow mutually exclusive needs to read "Model Aircraft Aerodynamics" by Martin Simons ISBN 978-185486-190-0 or some other authoritative reference explaining airfoil camber.
BobKeller - 01/05/2015
I agree. But common usage differs. It just is what it is. So when composing a model kit instruction manual aimed at the public, I'd say best bear that in mind. Otherwise you may be technically correct, but the majority of your customers will have misunderstood what you meant.
SteveWMD - 01/05/2015
Hi - a photo of the Veron Impala for the plan page on Outerzone [see more pics 004].
Anon - 04/01/2016
Impala built from Outerzone plan [more pics 005].
GeorgeSlocombe - 08/06/2016
Added superb pic of Impala built to 70%, thanks to Al [more pics 006].
Mary - 28/04/2017
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- Impala (oz4658)
- Plan File Filesize: 1153KB Filename: Impala_52in_oz4658.pdf
- Supplement Filesize: 303KB Filename: Impala_52in_oz4658_instructions.pdf
- Supplement Filesize: 601KB Filename: Impala_52in_oz4658_previous.pdf
- Supplement Filesize: 783KB Filename: Impala_52in_oz4658_review.pdf
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