Le Forum Avions Piel, consacré aux Pierres Précieuses. Super Emeraude, Beryl, Saphir, CP80 etc .

Trevor WILCOCK

Bonjour.

La vue de côté de la CP301 montre un profil bas qui fait un pas vers le haut à l'arrière du capotage. Le coin bas de la fuselage (à l'arrière du capotage) est un angle droit.

Je crois que la CP1301 montre un profil qui est continu entre capotage et fuselage; il y a, a chaque côté, un "mur" (max. 5cm de hauteur et 5cm de largeur), verticale à l'intérieur, courbé à l'extérieur; pas d'angle droit.

Est-ce qu'on peut me dire la raison pour ce changement entre CP301 et CP 1301?

Trevor Wilcock
CP 301S Smaragd G-DENS, Angleterre

cp1315 · Administrateur Inscrit le: 07 Sep 2004 Messages: 1909

Bonjour Trevor

J'ai du mal à comprendre ta question.

J'ai comparé les deux plans de coté du CP301 et CP1310, je ne vois pas ce que tu veux dire.

Try to explain your question in english Embarassed

Peut etre que quelqu'un à compris ?

Laurent

Trevor WILCOCK · Posté le: Sam Aoû 26, 2006 2:48 pm Sujet du message:

Bonjour Laurent,

Veuillez pardonner ma pauvre commande de la langue - essayons en anglais!

Please compare the side views of the bottom line of the fuselage of the CP301 and CP1310: http://www.avions-piel.com/ftopic39.html (second message) and http://www.avions-piel.com/ftopic3.html. Directly behind the engine cowling of the CP301, the fuselage bottom line steps upwards while the CP1310 is a smooth line from engine cowling to fuselage. On my CP301S, behind the engine cowling, the fuselage bottom and side form a right-angle. On a CP1310 that I saw last week, a fairing has been added at each side to give a smooth line from cowling to fuselage. This fairing is approximately a quarter-circle in cross-section, vertical on the inside face, but rounded ouside to give a rounded bottom edge to the fuselage rather than a right-angle. It is about 5cm wide at the forward end, tapering rearwards.

I am interested because on my CP301S I sometimes get buffeting of the tailplane which appears to be caused by turbulent flow starting at the inboard leading edge of the left wing, particularly at low power. My suspicion is that cross-flow from the propellor is separating at the right-angle formed by the fuselage side and underside just forward of the wing, and that the fairings on the CP1310 were added to overcome this problem. Do you have any information?

Amicalement,

Trevor Wilcock

cp1315 · Administrateur Inscrit le: 07 Sep 2004 Messages: 1909

Hi Trevor

Do you mean this section ?

Trevor WILCOCK · Posté le: Sam Aoû 26, 2006 8:32 pm Sujet du message:

Hello Laurent,

Ca y est! On the CP1310 that I looked at, the difference was provided by the blocks that I described, so that for most of the width of the fuselage below the fuel tank the two designs are identical, it's just the outermost edges that differ. See attachment.

Regards,

Trevor

cp1315 · Administrateur Inscrit le: 07 Sep 2004 Messages: 1909

Hi Trevor

Ok, now i known what about you are speaking !!!

I have the same on CP1315

Laurent

Trevor WILCOCK · Posté le: Sam Aoû 26, 2006 10:21 pm Sujet du message:

Hi Laurent - OK, but do you know why this change was introduced?

Regards,

Trevor

Mael · Brevet de Base Inscrit le: 26 Nov 2004 Messages: 81

Hi there,

Cooling maybee ?!?!? Question

It may be some kind of vent allowing the air to flow out of the engine compartment.
In order to cool the engine, there must be an airflow around it. And in order to have an airflow there must be a way in "front air intake" and a way out "that kind of vent"... maybe. Question

Cette solution est peut etre déstinée à faciliter la circulation d'air dans le compartiment moteur afin d'en assurer le refroidissement ?!?!?

Best regards,
Maël.

Trevor WILCOCK · Posté le: Lun Sep 11, 2006 5:51 pm Sujet du message:

Hi Maël,

Peut-être, mais je me demande si c'est (aussi?) pour ameliorer l'écoulement de l'air autour de la jonction de l'aile et le fuselage.

Amicalement,

Trevor