Hello i Try somme stalls with and without flaps
The stabilizator stall before the wing
Is that normal ?
Thanks
With my RV8, I experience what i believe is a shadowing of the horizontal stabilizer by full flaps under some conditions. It causes an elevator control pressure reversal. This typically occurs when I have an aft cg, such as a passenger.
Hello i Try somme stalls with and without flaps
The stabilizator stall before the wing
Is that normal ?
Thanks
Salut, Si la queue venait à caler, alors le nez se cabrerait de manière incontrôlable, et la récupération serait douteuse sans une goulotte de traînée pour redescendre le nez. Regardez le F-101 Voodoo pour référence.
Hi,
If the tail were to stall, then the nose would pitch up uncontrolably, and recovery would be doubtful without a drag chute to get the nose down again. Look at the F-101 Voodoo for reference.
If the tail were to stall, then the nose would pitch up uncontrolably, and recovery would be doubtful without a drag chute to get the nose down again.
Have buffet ... can’t stall my wing ! I will do more stall next week to see
I don’t think that’s the way RVs would behave in a tail stall. These planes aren’t susceptible to tail stalls, and the only time that I’ve even heard of tail stalling in conventional type aircraft is when encountering tail plane icing. While using flaps towards the higher limit of flap speeds, the angle of incidence on the tail goes more negative, and with ice could stall. Since the tails of these planes produce down force, “stalling” the tail and losing this downforce would not cause the nose to rise, but cause the nose to drop. The OP is thinking he’s got tail stall because the main wing isn’t the tail stalling yet he’s got buffeting.. a better description would be to say that he’s lost elevator authority.
I disagree that if the tail were to stall the nose would go down. I don't have the time for an aerodynamic lesson, but without the taildownward force the nose would rise x look at the center of pressure as the wing stalls stalls. .
I disagree that if the tail were to stall the nose would go down. I don't have the time for an aerodynamic lesson, but without the taildownward force the nose would rise x look at the center of pressure as the wing stalls stalls. .
Steve
Scott's observation still applies to the original poster's situation of solo, minimum fuel.
Sam
Maybe not....
I wasn't actually replying to the original post so wasn't thinking about the context of minimum speed near stall.
I was just pointing out that when talking in general about the effects of the trimming force of the tail, it is generally a down force which is contrary to what someone previously posted.
Scott, Steve,
I'm thinking of the original poster (we are trying to help him, right?)- solo, 25g of fuel; in my RV8 with a Hartzell composite, I'm right at the forward CG limit. This would give my HS positive down force at stall, according to Steve's observations. Don't know what the original poster has in the baggage compartment, but if not much, then it's a reasonable assumption (let's not split hairs) that he has positive down force. Again, trying to help out a guy wondering how to approach what he is seeing. I was trying to help him build a test to verify the wing is in fact stalling, even though the pitch change is slight, by looking at altitude loss to indicate a stall. I'm thinking that is what is tripping him up. The tail stall is just a distraction.
Sam