Is this possible (there is probably a technical way to explain this, but I'm to
lazy to translate):
As the rocket goes up the rail, it pushes on the rail. When it gets to the
top, the rail pushes back on the aft end of the rocket, pivoting the rocket.
Mike
On Friday, June 19, 2015 7:52 AM, Chris J Kobel <Chris.J.Kobel@xxxxxxxx>
wrote:
I recall measuring 11 mph from the WNWat 88 degF at our ~9:50am launch time.
I believe as soon as the topbutton clears, any rotation would have to take
place about the bottom button.
Chris
From: Kurt Gugisberg <kurtgug@xxxxxxxxx>
To: "roc-chat@xxxxxxxxxxxxx"<roc-chat@xxxxxxxxxxxxx>,
Date: 06/17/2015 05:40 PM
Subject: [roc-chat] Re:Punisher Drag Race and Discussion of Thrust
Misalignment
Sent by: roc-chat-bounce@xxxxxxxxxxxxx
I still am voting for the rail button thing. Assoon as the top button clears
it will want to rotate around the cg. Now what is causing the force that makes
it want to rotate? Did we discuss weathercocking on a barely stable rocket?
How hardwas the wind blowing at the time?
Kurt
On Wed, Jun 17, 2015 at 4:44 PM, R Dierking <applerocketry@xxxxxxxxxxx>wrote:
So, what do you think? Malformed nozzles, chamberpressure too high, exhaust
gases thrust vector rocket...
Sent from my iPhone
On Jun 17, 2015, at 4:24 PM, "Kurt Gugisberg" <kurtgug@xxxxxxxxx>wrote:
From the video, I could see that my Punisher also veeredoff after it left the
pad. I had to leave my casing with Davidbecause it had a heat bulge in the
end near the forward seal. Soit was probably close to catoing too.
Looks like we have a cast of characters that might leadto to behavior we saw:
misaligned thrust vectoring, rail button placement,low level of stability with
high thrust motor. The only thing itmight not be is rail whip.
Kurt
On Wed, Jun 17, 2015 at 1:02 PM, R Dierking <applerocketry@xxxxxxxxxxx>wrote:
I’m sure we can come up with things toinvestigate and even reduce this
misalignment problem.
Who’s interested in a Punisher 2 masslaunch? I think we should use the same
K1440 engine and leave itup to each flyer if they are going to modify the rail
buttons, pad, whateverelse. We have lots of time to collect details on each
project.
Chris, would it be possible to post somedetails of the AC stand used to test
for misalignments?
Do you think that creating a way to holdthe rocket on the pad until max thrust
is achieved would help?
I’m wondering why David Reese has notjoined this discussion because wouldn’t he
be one of the best peopleto advise on something like this?
Again, I think building a large launchpad/test stand for ROC launches would be
cool and we probably wouldn’tneed the contribution of many people to do it. We
could use the padat Black Rock for XPRS or BALLS. Again, I’m offering to buy
thetrailer for the project.
Richard Dierking
