---------------------------------------------------------- Rocket-List Digest Archive --- Total Messages Posted Thu 05/22/03: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:53 AM - Fin attach (Frazier, Vincent A) 2. 07:41 AM - Re: Fin attach/rudder flutter (Boyd C. Braem) 3. 12:01 PM - Re: Fin attach/rudder flutter (Fouga434@aol.com) 4. 01:44 PM - Re: Fin attach/rudder flutter (Boyd C. Braem) 5. 01:59 PM - Fin attach (David.vonLinsowe) ________________________________ Message 1 _____________________________________ Time: 06:53:47 AM PST US Subject: Rocket-List: Fin attach From: "Frazier, Vincent A" --> Rocket-List message posted by: "Frazier, Vincent A" SNIP Subject: Rocket-List: Fin attach From: "David.vonLinsowe" --> Rocket-List message posted by: "David.vonLinsowe" I've heard that Rockets have an extra doubler as compared to a RV where the front fin spar attaches. Is this true? If it's so, could someone share some details? Rudder counter balances... I've noticed some Rockets without them yet Van has included them on all the new series of RV's. Are they needed for flutter prevention? Thanks, Dave SNIP http://www.usi.edu/science/chemistry/vfrazier/Everything%20else.htm scroll about one third of the way down for a pic of how I changed my VS attach to resemble the F-1 stuff. I don't have a rudder counter balance. Is any of this necessary? According to several HR drivers I've talked to.... No. It's your choice then, isn't it? Vince ________________________________ Message 2 _____________________________________ Time: 07:41:59 AM PST US From: "Boyd C. Braem" Subject: Re: Rocket-List: Fin attach/rudder flutter --> Rocket-List message posted by: "Boyd C. Braem" The Super 6 has the old style rudder with the 0.020 skins. The calculated Vne with the airframe improvements is 293 mph. I've had it over 300 mph in a dive (Vd), and since I'm typing this, there was no destructive flutter. Boyd. Frazier, Vincent A wrote: >--> Rocket-List message posted by: "Frazier, Vincent A" > > >SNIP >Subject: Rocket-List: Fin attach >From: "David.vonLinsowe" > >--> Rocket-List message posted by: "David.vonLinsowe" > >I've heard that Rockets have an extra doubler as compared to a RV where >the front fin spar attaches. Is this true? If it's so, could someone >share some details? > >Rudder counter balances... I've noticed some Rockets without them yet >Van has included them on all the new series of RV's. Are they needed >for flutter prevention? > >Thanks, >Dave SNIP > > >http://www.usi.edu/science/chemistry/vfrazier/Everything%20else.htm > >scroll about one third of the way down for a pic of how I changed my VS attach to resemble the F-1 stuff. > >I don't have a rudder counter balance. > >Is any of this necessary? According to several HR drivers I've talked to.... No. > >It's your choice then, isn't it? > >Vince > > > > ________________________________ Message 3 _____________________________________ Time: 12:01:38 PM PST US From: Fouga434@aol.com Subject: Re: Rocket-List: Fin attach/rudder flutter --> Rocket-List message posted by: Fouga434@aol.com GEE WHAT HAPPENS WHEN YOU ARE GOING OVER 300 MPH IN A DIVE AND YOU DO GET FLUTTER DO YOU GET A RE ENACTMENT OF THE COLUMBIA ONLY WITH OUT THE FIRE BALL..... JUST THE CRUPPLED PLANE WITH A SURPRISED EX TEST PILOT ________________________________ Message 4 _____________________________________ Time: 01:44:03 PM PST US From: "Boyd C. Braem" Subject: Re: Rocket-List: Fin attach/rudder flutter --> Rocket-List message posted by: "Boyd C. Braem" Well, the Super 6 has a unique airframe/engine combination and to develop a Vn plot for the aircraft you have to fly it.. It's called test flying. That's part of the process. If something would have happened, the pilot (me) would have been, let's say "busy", not necessarily "surprised", because your mindset has to be that you know something could happen (they do have things called parachutes, helmets with visors, steel toed boots, Nomex, etc.). But the 'plane was well designed, engineered and built and nothing did happen taking it to the edges of its envelope. But, yes, if you do get true flutter in a control surface, the assumption is that it will destruct, which is why I find it amusing that the aerodynamic guys call it flutter instead of disingetrating, or kabooming or simply falling apart--I mean, flutter is like a little gentle butterfly landing on your finger on a cool summer morning. do not archive Fouga434@aol.com wrote: >--> Rocket-List message posted by: Fouga434@aol.com > >GEE WHAT HAPPENS WHEN YOU ARE GOING OVER 300 MPH IN A DIVE AND YOU DO GET >FLUTTER DO YOU GET A RE ENACTMENT OF THE COLUMBIA ONLY WITH OUT THE FIRE >BALL..... JUST THE CRUPPLED PLANE WITH A >SURPRISED EX TEST PILOT > > > > ________________________________ Message 5 _____________________________________ Time: 01:59:30 PM PST US Subject: Rocket-List: Fin attach From: "David.vonLinsowe" --> Rocket-List message posted by: "David.vonLinsowe" Thanks Randy. Dave Time: 05:53:47 PM PST US From: Randy Pflanzer Subject: Re: Rocket-List: Fin attach --> Rocket-List message posted by: Randy Pflanzer You can go to http://mywebpages.comcast.net/f1rocket/ for detail construction pictures of the area in question. On the F1, the rudder counter balance is mandatory. Randy F1 Rocket #95