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Bonanza Model 35 Spin Characteristics  
User currently offlineMeister808 From , joined Dec 1969, posts, RR:
Posted (10 years 10 months 6 days 3 hours ago) and read 3995 times:

A few friends and I got into a slight discussion about the spin characteristics of the V-tail Beech. We realized that we really have no idea what would happen to that airplane in a spin. What is the recovery procedure? Same as for any other retractable single, anything different? Any astonishingly bad characteristics?

Thanks.

-Meister


11 replies: All unread, jump to last
 
User currently offlineSccutler From , joined Dec 1969, posts, RR:
Reply 1, posted (10 years 10 months 6 days 2 hours ago) and read 3975 times:

Nope, pretty much normal characteristics.

User currently offlineQantasA332 From , joined Dec 1969, posts, RR:
Reply 2, posted (10 years 10 months 6 days 2 hours ago) and read 3961 times:

I'm not sure about spin recovery procedures, but it is a fact that in most cases, V-tail aircraft (along with T-tail aircraft) have better spin recovery characteristics than conventional-tail aircraft. On a side-note, V-tails also usually reduce drag, mainly interference drag (due to the fewer number of control-surface to fuselage junctions). A major disadvantage of V-tails has to do with control-linkage issues...

Cheers,
QantasA332


User currently offlineSLCPilot From , joined Dec 1969, posts, RR:
Reply 3, posted (10 years 10 months 5 days 23 hours ago) and read 3919 times:

I just have a few questions....

Sccutler, do you speak from experience?

QantasA332, why does a V-tail have better spin recovery tendancies?

While my experience with V-tail spins in limited to model airplanes, the ones I flew tended to have poor recoveries, and required POWER & the appropriate aerodynamic control inputs. On more than one occasion I spun in a Doddger (Quickie 500 racer) with little or no damage. It would flat spin very well. Bear in mind I flew this plane as a sport plane and didn't spin it while racing.

I agree that interference drag is reduced with V-tails, but I suspect the net effect is they have their limits. Most (all?) open class sailplanes do not have V-tails, even though many 15m ships do.

SLCPilot



User currently offlineQantasA332 From , joined Dec 1969, posts, RR:
Reply 4, posted (10 years 10 months 5 days 22 hours ago) and read 3918 times:

...why does a V-tail have better spin recovery tendancies?

It is known fact that increased dihedral or effective dihedral (manifested in either the wings or tail, or both) helps to eliminate the spiral divergence mode, and helps recovery from it. Because V-tails are essentially tails of very high dihedral, the aforementioned spin-helping characteristics are present...

Cheers,
QantasA332

(Am I confusing the spin you're discussing with spiral divergence mode? I know what the latter is, of course, but I'm not 100% sure that you're talking about the same thing as I am when you use the word 'spin'...)


User currently offlineSLCPilot From , joined Dec 1969, posts, RR:
Reply 5, posted (10 years 10 months 5 days 14 hours ago) and read 3885 times:

QantasA332,

If you asked me if a V-tailed Bonanza tail had dihedral or anhedral I'd say it had the effect of "anhedral". In other words, if we consider the direction that the tail produces it's lift (down), the tail has anhedral.

I can't answer the question, but I have always wondered why more airliners don't have tails like Falcon 50s, with the tailfeathers being "bent" down slightly.

I always found it interesting that if you were designing a very efficient aircraft you'd put the vertical stab and rudder on the bottom of the fuse so they would provide a rolling moment in the direction of the applied rudder. As it is (on top typically), rudder application provides a rolling moment opposite of the applied rudder direction.

Fly Safe!

SLCPilot


User currently offlineMeister808 From , joined Dec 1969, posts, RR:
Reply 6, posted (10 years 10 months 5 days 10 hours ago) and read 3865 times:

Interesting. Thanks, all.

-Meister


User currently offlinePPGMD From , joined Dec 1969, posts, RR:
Reply 7, posted (10 years 10 months 5 days 10 hours ago) and read 3862 times:

A major disadvantage of V-tails has to do with control-linkage issues...

That and flying off when you least expect it.  Big grin
AD 94-20-04 R1

The old V-tails are fun planes to fly.


User currently offlineBMAbound From , joined Dec 1969, posts, RR:
Reply 8, posted (10 years 10 months 5 days 9 hours ago) and read 3859 times:

Not from personal experience (never flown a V-tail), but my instructor said that people have "problems" (not the right word..) aligning with the runway on final approach. He said there's a lot of rudder work to stay centered.

Anyone experienced this?

johan


User currently offlineQantasA332 From , joined Dec 1969, posts, RR:
Reply 9, posted (10 years 10 months 5 days 8 hours ago) and read 3848 times:

If you asked me if a V-tailed Bonanza tail had dihedral or anhedral I'd say it had the effect of "anhedral". In other words, if we consider the direction that the tail produces it's lift (down), the tail has anhedral.

Whether a wing/tail/etc. has either dihedral or anhedral doesn't depend on where the lift is going; lift is irrelevant. All that is considered is the angle between the surface in question and 'level', for lack of a better word.

Again, check this thread out...

Cheers,
QantasA332


User currently offlineSccutler From , joined Dec 1969, posts, RR:
Reply 10, posted (10 years 10 months 5 days ago) and read 3821 times:

In my experience, many pilots has trouble lining up- seem to be afraid to use the rudder enough.

User currently offlinePPGMD From , joined Dec 1969, posts, RR:
Reply 11, posted (10 years 10 months 5 days ago) and read 3827 times:

Never had any problems lining up for normal landings. It did seem to run out of rudder during some x-wing landings. But those are pretty rare these days.

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