Lioré et Olivier (LeO) Prototypes & Projects

[PhR]

According to the sketch the main landing gears designed as retractable to the wing, isn't it?
I also wonder, if their any standard scale of windtunnel models, that could give the clue to the probable size of the aircraft?

Yes, the LeO 29 wind tunnel report precises:

"The tests carried out on the full wing models and the wing with the landing gear recessed in the lower surface were carried out in the wind tunnel of the Saint-Cyr Aerotechnical Institute"
In addition, in the plan of the wing, you can read:


The overall wingspan of the model is 10,26m:


So the original model had to have a wingspan of 51,3 m. This looks very ambitious in 1929.

 

[Silencer1]

The overall wingspan of the model is 10,26m:
View attachment 784386So the original model had to have a wingspan of 51,3 m. This looks very ambitious in 1929.

Thank you for detailed answer!
I have the impression, that phrase "Echelle: 1/5 de la maquette" means the scale of the sketch to the size of model, not the scale of model to the actual aircraft. Even the giant Do-X has only 4,8 m wingspan, with all its 12 engines and numerous people on board.

 

[PhR]

I have the impression, that phrase "Echelle: 1/5 de la maquette" means the scale of the sketch to the size of model, not the scale of model to the actual aircraft.

You are probably right : 20.5 cm in the paper seems correct.

 

[PhR]

Lioré et Olivier has studied various projects during this period, without numbering, like the attached one for exemple in 1927.

Finally, I found an identification for this study (message #71). It became the LeO 34. It was also tested in wing tunnel under this identification in 1932: "aircraft without a horizontal stabilizer, with two staggered wings".

 

[hesham]

Finally, I found an identification for this study (message #71). It became the LeO 34. It was also tested in wing tunnel under this identification in 1932: "aircraft without a horizontal stabilizer, with two staggered wings".

Amazing find my dear Philippe,

and was it a light bomber or what ?

 

[Stargazer]

I have noticed that there is no photo of the LeO H183 in Philippe Ricco's PDF file recap.
This photo shows what looks like the H18 but with a tractor Hispano engine. Since the H183 was the only version with a Hispano, and since it was modified from the H18 (which was an amphibian, contrary to the H181) I believe this picture shows the H183 landing.




Likewise, there is no photo of the H191 or the H193. This photo found online is labeled as the H191:



And this one as the H193:

 

[PhR]

I have noticed that there is no photo of the LeO H183 in Philippe Ricco's PDF file recap.
This photo shows what looks like the H18 but with a tractor Hispano engine. Since the H183 was the only version with a Hispano, and since it was modified from the H18 (which was an amphibian, contrary to the H181) I believe this picture shows the H183 landing.

View attachment 792640

Hi Stargazer,
thanks for sharing. For me, this photo shows a LeO H23, not a H18.

 

[Stargazer]

A few mysteries that need solving:

• LeO H6: some photos show a slightly sesquiplane wing arrangement, while others show a later, inverted sesquiplane one.
  Is the inverted sesquiplane version the H6/2?
  
  
  
  
• H27: plans and models shown in contemporary publications show the push-pull engines blended into the wings; however, photos show that the actual plane had the engines carried on mounts atop the wings. Did the artwork show the configuration planned for the production version?
  
  
  
  
• LeO 21 with Hispano engine: if I look at the list of all LeO 21 versions, none seems to have used a Hispano engine.
  And yet the contemporary Hispano magazine showed this heavily retouched photo of what seems to be a Leo 21 in flight, describing it as using a 500 hp geared Hispano type. Is this one of the troop transport versions (LeO 213 and 214)? And if not, what is it? The LeO 212 was meant to use the 500 hp Hispano, but it wasn't built...
  
  

 

[Stargazer]

Hi Stargazer,
thanks for sharing. For me, this photo shows a LeO H23, not a H18.

After taking a closer look, I realize you are right. The gunner position in the nose is different in both airplanes.
So all H18 versions were pushers I guess.

 

[PhR]

• H27: plans and models shown in contemporary publications show the push-pull engines blended into the wings; however, photos show that the actual plane had the engines carried on mounts atop the wings. Did the artwork show the configuration planned for the production version?

Many different engine configurations were studied on LeO H47, as shown for example in the attached document. Gérard Bousquet had also published various photos of wind-tunnel models with different dispositions in his Docavia "Les paquebots volants".

 

[hesham]

By the way,

LeO H-132 was powered by 150 hp Hispano-Suiza 8 Aa engines
and not 180 hp,the H-131 was powered by later one

 

[PhR]

A few mysteries that need solving:

• LeO H6: some photos show a slightly sesquiplane wing arrangement, while others show a later, inverted sesquiplane one.
  Is the inverted sesquiplane version the H6/2?
  
  View attachment 792646 View attachment 792644View attachment 792645

His Stargazer.
Your hypothesis has sense, but I checked my photos and I can confirm that I have many pictures showing this wing configuration (with upper wing shorter than the lower one), but without landing gear. So, these two modifications are independant.

 

[PhR]

Likewise, there is no photo of the H191 or the H193. This photo found online is labeled as the H191:

View attachment 792641

As I said before, identification of many LeO models is a nightmare, with a lot of contradiction between sources. The LeO H191 is supposed to be a military version, but in this photo, the colors of the rudder are civil.
This photo is on my list, but based on my files it is not a LeO H19x, it's the LeO H133 c/n 01, with elongated hull.


Why do you say that there is no photo of LeO H193 in my list?

 

[hesham]

It's first time to me to hear about LeO/SNCASE C.301/2 ?!.

 

[PhR]

It's first time to me to hear about LeO/SNCASE C.301/2 ?!.

The image you show is the Richard Helicoplane project.
There is no relation with C-301, which is a well known Cierva autogyro modified by Pierre Renoux.

 

[PhR]

This is the LeO / SNCASE C-301:

 

[hesham]

The image you show is the Richard Helicoplane project.
There is no relation with C-301, which is a well known Cierva autogyro modified by Pierre Renoux.

Thank you my dear Philippe,

and I think you meant this person,

https://www.secretprojects.co.uk/threads/g-c-richard-aircraft-projects.28165/

 

[PhR]

Thank you my dear Philippe,

and I think you meant this person,

https://www.secretprojects.co.uk/threads/g-c-richard-aircraft-projects.28165/

Yes.

 

[TomcatViP]

Manufacturing the LeO:

View: https://youtu.be/xk4QMndM77s