[SPAM] Re: Snao G's

[Cameron Smith]

You didn't hear it down there?  ;-)
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Ron Van Putte
Sent: Friday, January 28, 2005 8:25 PM
To: discussion at nsrca.org
Subject: Re: [SPAM] Re: Snao G's
 

On Jan 28, 2005, at 7:05 PM, Cameron Smith wrote:
I look at it more as "Energy Management".   I'm replacing wings on a
large gasser from "Poor Energy Management" Dropped it to far with NO
throttle & Pulled a Sharp Parachute and the Crack could be heard across
the county.

Cameron - Was it a big county? <BG>

Ron Van Putte
----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Ken Thompson III
Sent: Friday, January 28, 2005 5:57 PM
To: discussion at nsrca.org
Subject: Re: [SPAM] Re: Snao G's

 

Walls I can see the stress, however I understand that the correct way to
enter a wall is at 1/4 throttle or less.  I'm not one of those big ego
guys, so correct me if I'm wrong.

Parachutes are more of a controlled fall, from a partial wall up high,
and Blenders begin from a stalled state.  Of course when you slam the
throttle to push the plane through the Blender, that could hurt a bunch.

 

Ken

 

 

 

----- Original Message -----

From: Ed Alt 

To: discussion at nsrca.org 

Sent: Friday, January 28, 2005 5:05 PM

Subject: [SPAM] Re: Snao G's

 

Yep, but the transition into it can be stressful.  Stuff like Walls,
Parachutes, Blenders, certain brands of Waterfalls put mucho strain in
the airframe. 

Ed

----- Original Message -----

From: Ken Thompson III 

To: discussion at nsrca.org 

Sent: Friday, January 28, 2005 4:16 PM

Subject: Re: Snao G's

 

Matt,

I could be wrong, but isn't 3D, by definition, done in a constant state
of stall?  Wouldn't that eliminate a lot of the high G's in the
maneuvers?  I wouldn't think the airframe would be in as stressed state,
when the flying surface is depending on prop wash, not air speed, to do
it's thing.

 

Ken

----- Original Message -----

From: Rcmaster199 at aol.com 

To: discussion at nsrca.org 

Sent: Friday, January 28, 2005 1:46 PM

Subject: Re: Snao G's

 

If this accelerometer is finding 13 G loads generated by a Pattern model
snap, a relatively low amount really, I imagine that a 3D model set up
for a full array of stunts has to be experiencing double that at least.

 

Earl could you do any 3D type maneuvers and measurements with the Yak?

 

Very informative discussion BTW, and may result in improved more
efficient building technique, read-- lightest for the desired strength.

 

thanks

 

matt

 

In a message dated 1/28/2005 1:32:35 PM Eastern Standard Time,
d.pappas at kodeos.com writes:

That's proof of stall!

If the G loading rises suddenly, and then holds or droops continuously
during the roll, then it's probably an accelerated barrel.

If the profile is sudden rise, sudden drop to maybe 1/2, then onload,
you have a real snap.

 

Yia,

    Dean

 

Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Rcmaster199 at aol.com
Sent: Friday, January 28, 2005 11:45 AM
To: discussion at nsrca.org
Subject: Re: Snao G's

Good point. Once in the stall, the model should not see the same
continued G load. Should drop dramatically. If the plane doesn't stall
to begin with, different story.

 

Matt

 

In a message dated 1/28/2005 11:23:25 AM Eastern Standard Time,
d.pappas at kodeos.com writes:

Let me add another two cents worth ...

Earl,

What is the sampling rate on your data logger?

Can you see if the maximum 13-Gs at 100 MPH was sustained for the entire
half second or so that it took to complete the snap,

or was it a short spike (like 0.1 second)  and then sustained at say
half of that value, for the rest of the snap.

Of course, if the data logger samples once a second, we have almost no
way of knowing.

 

Later,

        Dean

 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20050129/654b410f/attachment.html