-- Guy
________________________________
From: Jim Covington <jim@covington.name>
To: Titanaircraft@yahoogroups.com
Sent: Sunday, September 27, 2009 7:24:48 AM
Subject: Re: [Titanaircraft] Re: Titan II w/ Jab 3300?
I've personally flown to over 6 Gs at just about 1000lbs GW, and it's
quite difficult to achieve. The wing produces so much drag at those high
angles of attack that the airspeed bleeds off quickly - and the G-loads
with it. The only way to sustain it is with a descending spiral. It's
not likely that you'll reach these loads accidentally.
Before you go out and test, please remember that every aircraft is
different and you are the test pilot. Not everyone can handle high G
loads. Physical fitness plays a big part. I won't go into all the
details of why, but watch this video - this reporter repeated passes out
at around 5 Gs.
http://www.youtube. com/watch? v=hKR52wMLAVM
I haven't sandbagged my wing, but I remember hearing from someone at the
factory (Sam?) when I picked up my wing that they had tested a 150VNE 23
1/2' wing to 9000lbs - about 9Gs at 1000lbs - and the wing didn't break.
It didn't even bend enough to be damaged. That test wing was still
flying a few years ago. So that's how the factory can say that you can
still hold 6Gs at 1140lbs - you can actually hold over 7.5Gs at 1140lbs
on a 150VNE spar. Remember that the wing spar isn't the only thing
getting added stress during Gs - everything in the plane is under added
stress.
Your mileage may vary; you're the test pilot and it's still an
experimental aircraft.
Kimberly Panos wrote:
>
>
> Brian,
>
> The 150 VNE wing and mounts are very stout, especially, the
> 23-1/2-footer. As the builder, you can set the gross as whatever you
> want. You could say it was 2000 lbs., but that isn't realistic or
> believable. We set our gross at 1320 lbs. You just do a little math to
> figure out the reduction of G-loading. However, with the design of the
> wing, you would induce so much drag, it would be unlikely you could
> impose any damaging force on the wing if flying less than 100 MPH,
> even if you tried. I know Jim Covington has done some testing in this
> regard.
>
> Because you can run a 3-blade prop on the Jabiru 3300 and Rotax
> 912-series, the Jabiru 2200 carries the most prop noise, followed by
> the 912-series because of the loud exhaust combined with the prop
> noise, then the Jabiru 3300. None of the Jabiru engines themselves can
> be heard over the prop, unless you remove the muffler, but you don't
> want to do that anyway.
>
> --Kimberly
>
> ----- Original Message -----
> From: beberle1@bellsouth. net <mailto:beberle1% 40bellsouth. net>
> To: Titanaircraft@ yahoogroups. com
> <mailto:Titanaircra ft%40yahoogroups .com>
> Sent: Saturday, September 26, 2009 6:29 PM
> Subject: [Titanaircraft] Re: Titan II w/ Jab 3300?
>
> Is there a structural diffence between the 2D and 2S? How did they
> raise gross to 1140lbs and still maintain +6/-4 Gs? I'm looking at
> cruise in the 8,000ft range, so the 23' wings would be fine. Do the
> engine mounts have to be enhanced on a 2D to support a 3300?
>
> Maybe a little off-track, but how loud is a 2200/3300 compared to the 912?
>
> thanks
> Brian
>
> --- In Titanaircraft@ yahoogroups. com
> <mailto:Titanaircra ft%40yahoogroups .com>, "Kimberly Panos"
> <kimberly@.. .> wrote:
> >
> > When we registered our 2S, we set the gross at 1320 lbs., and we've
> had it loaded just short of there on a few occasions. It will cruise
> nicely beyond 14,500' (I can't say how much beyond here) with the
> 23-1/2 wing, but the 26' is nicer for climbing way up high if you do
> it regularly when loaded to gross.
> >
> > --Kimberly
> >
> >
> > ----- Original Message -----
> > From: beberle1@...
> > To: Titanaircraft@ yahoogroups. com
> <mailto:Titanaircra ft%40yahoogroups .com>
> > Sent: Friday, September 25, 2009 2:06 PM
> > Subject: [Titanaircraft] Titan II w/ Jab 3300?
> >
> >
> > I'm drooling over the TitanII w/ Jab 3300 for sale in Cali.
> Obviously, it's going to burn more fuel, but is a 3300 too much
> weight/power for a TitanII?
> > Researching this site, I see mention of 1,000lb gross aerobatic,
> 1,200lb utility. I assume this Titan weighs around 700lbs. Is that a
> realistic 500lbs to play with?
> >
> > thx,
> > Brian
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
> [Non-text portions of this message have been removed]
>
>
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
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