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Makaya

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Jan 18, 2016
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5
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Candillargues, FRANCE / Ndajmena, CHAD
The Jodel D11 serie (as most of the subsequent Robin serie 100 200 300 and 400) use a NACA "23013,5"
Jean Delmontez, the designer tried to squeeze the biggest spar in the wing with out the penalty of the more draggy 23015. So he used a 13,5% thickness. (Some of the early Robin 400 without wing roots tank use a 4412).

I believe the Falconer has a different (longer) aspect ratio from the original Jodel.

I was lucky to own a 1955 Robin 105A.
Powered by a Continental O200, it would cruise 120 mph on 5 usg/h at MTOW, which allows full tank (28 usable usg) and 3 sandand FAA people aboard. Not tales. That's what I was doing.

The early sixties version (DR 1051 M) were dubbed "Sicile" after Pierre Robin won the "Sicilia Air Race" with an improved version at an average speed of 170 mph...

But my favorite stays the little vw powered D9 Bébé Jodel. The biggest bang for the bucks on can expect.

Pix 1 : F-GYNU DR 105A in Candillargues LFNG

Px 2 : Polo and Vince having fun in D9 around Saint Rémy de Provence.
 

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Pops

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Jan 1, 2013
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7,886
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USA.
At one time I was thinking of building the D-9 but thinking I am a little to big for the cockpit.
My Falconar F-12 had the same wing span and cord as the D-11 of 137 sq ft of area. Heavier built box spar and ribs for the increase GW of 1800 lbs and the large Lycoming engines.
Looks like the D-9's in you picture has the 40 hp VW engine by the straight down intakes tube into the heads. You can get the bolt on 83mm pistons and cylinders instead of the stock 77's for 45 HP. The 40 hp VW engine has a lower redline of the rpm and at prop speeds the torque is not very much less than the faster turning 1600 cc engine.
I built a 1200 cc , 40 HP engine for the SSSC and flew it for the first 32 hrs before I installed the 1835 cc engine. If I was 140/150 lb light weight instead of my 235 lbs, I would have left the 40 hp engine on the airplane.
Picture of the 1200 cc 40 HP engine, used a Culver 52"x 24" prop.
 

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simflyer

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Sep 24, 2015
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174
Location
Moravia
The Jodel D11 serie (as most of the subsequent Robin serie 100 200 300 and 400) use a NACA "23013,5"
Jean Delmontez, the designer tried to squeeze the biggest spar in the wing with out the penalty of the more draggy 23015. So he used a 13,5% thickness. (Some of the early Robin 400 without wing roots tank use a 4412).
.....
I think You're partly wrong - D9 and D11 are using 23012, but later D18 is using 43013.5
Also some sources are probably misleading. Try to compare 23012 with airfoil written down of D11 drawing coords.
 

Makaya

Member
Joined
Jan 18, 2016
Messages
5
Location
Candillargues, FRANCE / Ndajmena, CHAD
😊
I think You're partly wrong - D9 and D11 are using 23012, but later D18 is using 43013.5
Also som
Shame on me, Simflyer : you are right.
The D9 and 11 series do use 23012.
The 100 200 300 400 500 series use 23013,5 (all have the same dimension wing, with different spars/ flaps, air brakes settings)
The D18/19/ 20 and DC21 use 43013,5
 

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bmcj

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Apr 10, 2007
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13,306
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Fresno, California
=old Russia time=

=38:00 =120 kg, 2-place ! (BEE 008/honey)
I skipped through, but will have to watch the whole thing later.

I kind of like the ones at 1:57, 28:11 and 33:40, but who couldn’t like the one at 34:30? It had me rolling on the floor.

The one at 20:45 was interesting too.
 
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simflyer

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Sep 24, 2015
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Moravia
😊 Shame on me, Simflyer : you are right. The D9 and 11 series do use 23012. ..... The D18/19/ 20 and DC21 use 43013,5
Seem that 43013.5 is best choice - used on D18 is not exact, as it have filled cusp on bottom behind of leading edge.
Am interresting if could be difficult to buil it as exact 43013.5. I think that D9 with 43013.5 and chord of 1.2m would be better than 23012 with 1.4m. Also Jodel wing too trapezoidal, high dihedral + much of twist could be improved.
I like very much many of french designs MiniBulle, SourisBulle, Pottier P130, L11 ... . What plane are You building?
 
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Makaya

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Jan 18, 2016
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Location
Candillargues, FRANCE / Ndajmena, CHAD
My last project was to refurbish a beautifyfull GY 20 MiniCab (the ancester of the Cavalier). But my new job sent me away from home on a non commuting roster.
I have flown a 1953 D9 without the current twist few decades ago. She was a delight for her 26,5 hp. But very very demonstrative when it came to the stall. She would flick beautifully.
 

Twodeaddogs

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Jan 18, 2009
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Dunlavin, County Wicklow,Ireland
The thing about the Jodel airframes is that they are very simple structures; the seat base on a 112 or a 117 is simply a piece of slanted plywood so you needto sit on a cushion ora piece of memory foam. Early D112s had no fabric on the hull and that was simply painted over;later ones had a very light fabric, glider grade,covering the hull. The crank on the wing has been regarded as difficult to build but amateurs have been doing it for years. Ive flown the 112, 117 and 120 and they are delightful and punch way above their weight,performance wise.
 
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