Today's Message Index:
----------------------
1. 07:54 AM - Re: Aft CG (Michael T. Ice)
2. 12:13 PM - Re: Aft CG (Bill Repucci)
3. 03:29 PM - Re: Aft CG (Chenoweth)
4. 06:43 PM - Re: Aft CG (Bill Repucci)
Message 1
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--> RV9-List message posted by: "Michael T. Ice" <aurbo@ak.net>
Bill,
I have the same concerns. I do plan on installing a larger tailwheel
assembly. Although I am not planning on using a wooden prop I do plan on
installing the elt and the strobe power packs farther forward.
It would be interesting to see what others think or have done?
An answer to your concerns would be to insulate both the firewall and front
floor heavily.
Mike Ice
Anchorage, Alaska
RV-9 Fuselage, installing wings for the first time
----- Original Message -----
From: "Chenoweth" <chenoweth@gwi.net>
Sent: Saturday, May 20, 2006 2:24 PM
Subject: RV9-List: Aft CG
> --> RV9-List message posted by: "Chenoweth" <chenoweth@gwi.net>
>
> This is a question for any of you with a completed tailwheel 9. I'm in
> the tail cone and mid section construction part of one and wonder about
> CG problems. I'm hoping to use a wooden prop and worry that I'll end up
> with a very aft CG if I do. That is leading me to wonder if ELT and
> strobe power supply placement should be other than behind bulkhead 706
> (which is where Van's strongly recommends I put them).
> Any comments and suggestions on this will be gratefully received.
> Bill
> Albion, Maine
>
>
>
Message 2
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--> RV9-List message posted by: "Bill Repucci" <bill@repucci.com>
Bill,
Check with Van's to verify what I'm about to say.
>From what I have read the RV-9 does not seem to have the same aft CG
issues as the -7A. I have played around with sample loadings while
moving the CG for and aft as much as 2" on the -9 and found everything
is good.
I suspect this is because of the RV-9's wing. Meaning that it is longer
and thus more of it is forward of the CG.
Also, on TW RV's there is less weight aft of the CG than on the A
models. A's have the main gear and steps aft of the CG where we only
have the TW, granted it is WAY back there but it still doesn't seem to
be an issue as it is offset by the heaver engine mount (two gear legs
mounts) and the gear legs and wheels them self way in front of the CG.
Van's also compensates a bit with a slightly longer engine mount for the
-9's. I know the one I have and the cowling are sized (extended) for
the O-235. This will help out with the Catto wooden prop I have sitting
on my shelf.
That is what I am hoping for as I'm putting a lighter engine in my -9
(O-290-D2). As a side note, I exchanged some emails with a gentleman
out West who has the same set up and he simply said not to worry about
the CG as it isn't a problem.
To verify this, check Dan C's site (www.rvproject.com) and play around
with his CG calculator. Granted, there are no -9's on the list, only
-9A's but you will get an idea of how the CG comes out.
Hope that helps.
Bill R.
www.repucci.com/bill/baf.html
-----Original Message-----
From: owner-rv9-list-server@matronics.com
[mailto:owner-rv9-list-server@matronics.com] On Behalf Of Michael T. Ice
Sent: Sunday, May 21, 2006 10:50 AM
Subject: Re: RV9-List: Aft CG
--> RV9-List message posted by: "Michael T. Ice" <aurbo@ak.net>
Bill,
I have the same concerns. I do plan on installing a larger tailwheel
assembly. Although I am not planning on using a wooden prop I do plan on
installing the elt and the strobe power packs farther forward.
It would be interesting to see what others think or have done?
An answer to your concerns would be to insulate both the firewall and
front
floor heavily.
Mike Ice
Anchorage, Alaska
RV-9 Fuselage, installing wings for the first time
----- Original Message -----
From: "Chenoweth" <chenoweth@gwi.net>
Sent: Saturday, May 20, 2006 2:24 PM
Subject: RV9-List: Aft CG
> --> RV9-List message posted by: "Chenoweth" <chenoweth@gwi.net>
>
> This is a question for any of you with a completed tailwheel 9. I'm
> in the tail cone and mid section construction part of one and wonder
> about CG problems. I'm hoping to use a wooden prop and worry that
> I'll end up with a very aft CG if I do. That is leading me to wonder
> if ELT and strobe power supply placement should be other than behind
> bulkhead 706 (which is where Van's strongly recommends I put them).
> Any comments and suggestions on this will be gratefully received. Bill
> Albion, Maine
>
>
>
Message 3
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--> RV9-List message posted by: "Chenoweth" <chenoweth@gwi.net>
Bill,
Great info and thank you very much.
The fellow I asked at Van's was singularly un-helpful with this. His
response was to not worry about the CG and if it came out too far aft use a
metal propeller. Sort of missed my point about wanting to use a wooden one
and provided absolutely no ideas about where/how to locate things like ELT.
strobe power supply, etc, farther forward. Was pretty adamant about not
making the baggage area floor removable, though.
I conclude from what you said that I should have no problem if I go ahead
and mount the ELT and all just behind the 706 bulkhead and, absent anyone
commenting to the contrary, I think that's what I'll do.
Bill C.
----- Original Message -----
From: "Bill Repucci" <bill@repucci.com>
Sent: Sunday, May 21, 2006 3:09 PM
Subject: RE: RV9-List: Aft CG
> --> RV9-List message posted by: "Bill Repucci" <bill@repucci.com>
>
> Bill,
>
> Check with Van's to verify what I'm about to say.
>
> >From what I have read the RV-9 does not seem to have the same aft CG
> issues as the -7A. I have played around with sample loadings while
> moving the CG for and aft as much as 2" on the -9 and found everything
> is good.
>
> I suspect this is because of the RV-9's wing. Meaning that it is longer
> and thus more of it is forward of the CG.
>
> Also, on TW RV's there is less weight aft of the CG than on the A
> models. A's have the main gear and steps aft of the CG where we only
> have the TW, granted it is WAY back there but it still doesn't seem to
> be an issue as it is offset by the heaver engine mount (two gear legs
> mounts) and the gear legs and wheels them self way in front of the CG.
>
> Van's also compensates a bit with a slightly longer engine mount for the
> -9's. I know the one I have and the cowling are sized (extended) for
> the O-235. This will help out with the Catto wooden prop I have sitting
> on my shelf.
>
> That is what I am hoping for as I'm putting a lighter engine in my -9
> (O-290-D2). As a side note, I exchanged some emails with a gentleman
> out West who has the same set up and he simply said not to worry about
> the CG as it isn't a problem.
>
> To verify this, check Dan C's site (www.rvproject.com) and play around
> with his CG calculator. Granted, there are no -9's on the list, only
> -9A's but you will get an idea of how the CG comes out.
>
> Hope that helps.
> Bill R.
> www.repucci.com/bill/baf.html
>
> -----Original Message-----
> From: owner-rv9-list-server@matronics.com
> [mailto:owner-rv9-list-server@matronics.com] On Behalf Of Michael T. Ice
> Sent: Sunday, May 21, 2006 10:50 AM
> To: rv9-list@matronics.com
> Subject: Re: RV9-List: Aft CG
>
>
> --> RV9-List message posted by: "Michael T. Ice" <aurbo@ak.net>
>
> Bill,
>
> I have the same concerns. I do plan on installing a larger tailwheel
> assembly. Although I am not planning on using a wooden prop I do plan on
>
> installing the elt and the strobe power packs farther forward.
>
> It would be interesting to see what others think or have done?
>
> An answer to your concerns would be to insulate both the firewall and
> front
> floor heavily.
>
> Mike Ice
> Anchorage, Alaska
> RV-9 Fuselage, installing wings for the first time
> ----- Original Message -----
> From: "Chenoweth" <chenoweth@gwi.net>
> To: <rv9-list@matronics.com>
> Sent: Saturday, May 20, 2006 2:24 PM
> Subject: RV9-List: Aft CG
>
>
> > --> RV9-List message posted by: "Chenoweth" <chenoweth@gwi.net>
> >
> > This is a question for any of you with a completed tailwheel 9. I'm
> > in the tail cone and mid section construction part of one and wonder
> > about CG problems. I'm hoping to use a wooden prop and worry that
> > I'll end up with a very aft CG if I do. That is leading me to wonder
> > if ELT and strobe power supply placement should be other than behind
> > bulkhead 706 (which is where Van's strongly recommends I put them).
> > Any comments and suggestions on this will be gratefully received. Bill
> > Albion, Maine
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
Message 4
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--> RV9-List message posted by: "Bill Repucci" <bill@repucci.com>
Bill,
As for the placement of items behind the 706 bulkhead, I would still be
careful. I put both the strobe power supply and ELT under the baggage
compartment floor using access doors. This will allow me to rivet the
floor in place.
I suspect the reason Van's wants both the baggage floor and seat pans
riveted in place is to make them act like a box structure as there is a
lot of loads going through those items. However, there are a good
number of planes flying with them screwed in place.
My -9 will have them riveted in place for two reasons. 1st, I'm lazy
and that is a lot of plate nuts. 2nd, I'm trying to make my -9 as light
as possible and those plate nuts and screws add a good bit of weight.
The reason for putting the ELT and transponder under the floor is also
twofold. 1st, it gets more weight out of the tail so I can avoid any
potential CG problems. (Even though I doubt I will have any.) 2nd, an
airplane with all the weight in the center handles better.
Here is a picture of where I put my ELT:
http://www.repucci.com/bill/images/elt%20with%20door.jpg
And here is the location of my strobe power supply:
http://www.repucci.com/bill/images/strobe%20power%20pack.jpg
Good luck,
Bill
-----Original Message-----
From: owner-rv9-list-server@matronics.com
[mailto:owner-rv9-list-server@matronics.com] On Behalf Of Chenoweth
Sent: Sunday, May 21, 2006 6:21 PM
Subject: Re: RV9-List: Aft CG
--> RV9-List message posted by: "Chenoweth" <chenoweth@gwi.net>
Bill,
Great info and thank you very much.
The fellow I asked at Van's was singularly un-helpful with this. His
response was to not worry about the CG and if it came out too far aft
use a metal propeller. Sort of missed my point about wanting to use a
wooden one and provided absolutely no ideas about where/how to locate
things like ELT. strobe power supply, etc, farther forward. Was pretty
adamant about not making the baggage area floor removable, though. I
conclude from what you said that I should have no problem if I go ahead
and mount the ELT and all just behind the 706 bulkhead and, absent
anyone commenting to the contrary, I think that's what I'll do. Bill C.
----- Original Message -----
From: "Bill Repucci" <bill@repucci.com>
Sent: Sunday, May 21, 2006 3:09 PM
Subject: RE: RV9-List: Aft CG
> --> RV9-List message posted by: "Bill Repucci" <bill@repucci.com>
>
> Bill,
>
> Check with Van's to verify what I'm about to say.
>
> >From what I have read the RV-9 does not seem to have the same aft CG
> issues as the -7A. I have played around with sample loadings while
> moving the CG for and aft as much as 2" on the -9 and found everything
> is good.
>
> I suspect this is because of the RV-9's wing. Meaning that it is
> longer and thus more of it is forward of the CG.
>
> Also, on TW RV's there is less weight aft of the CG than on the A
> models. A's have the main gear and steps aft of the CG where we only
> have the TW, granted it is WAY back there but it still doesn't seem to
> be an issue as it is offset by the heaver engine mount (two gear legs
> mounts) and the gear legs and wheels them self way in front of the CG.
>
> Van's also compensates a bit with a slightly longer engine mount for
> the -9's. I know the one I have and the cowling are sized (extended)
> for the O-235. This will help out with the Catto wooden prop I have
> sitting on my shelf.
>
> That is what I am hoping for as I'm putting a lighter engine in my -9
> (O-290-D2). As a side note, I exchanged some emails with a gentleman
> out West who has the same set up and he simply said not to worry about
> the CG as it isn't a problem.
>
> To verify this, check Dan C's site (www.rvproject.com) and play around
> with his CG calculator. Granted, there are no -9's on the list, only
> -9A's but you will get an idea of how the CG comes out.
>
> Hope that helps.
> Bill R.
> www.repucci.com/bill/baf.html
>
> -----Original Message-----
> From: owner-rv9-list-server@matronics.com
> [mailto:owner-rv9-list-server@matronics.com] On Behalf Of Michael T.
> Ice
> Sent: Sunday, May 21, 2006 10:50 AM
> To: rv9-list@matronics.com
> Subject: Re: RV9-List: Aft CG
>
>
> --> RV9-List message posted by: "Michael T. Ice" <aurbo@ak.net>
>
> Bill,
>
> I have the same concerns. I do plan on installing a larger tailwheel
> assembly. Although I am not planning on using a wooden prop I do plan
> on
>
> installing the elt and the strobe power packs farther forward.
>
> It would be interesting to see what others think or have done?
>
> An answer to your concerns would be to insulate both the firewall and
> front floor heavily.
>
> Mike Ice
> Anchorage, Alaska
> RV-9 Fuselage, installing wings for the first time
> ----- Original Message -----
> From: "Chenoweth" <chenoweth@gwi.net>
> To: <rv9-list@matronics.com>
> Sent: Saturday, May 20, 2006 2:24 PM
> Subject: RV9-List: Aft CG
>
>
> > --> RV9-List message posted by: "Chenoweth" <chenoweth@gwi.net>
> >
> > This is a question for any of you with a completed tailwheel 9. I'm
> > in the tail cone and mid section construction part of one and wonder
> > about CG problems. I'm hoping to use a wooden prop and worry that
> > I'll end up with a very aft CG if I do. That is leading me to
> > wonder if ELT and strobe power supply placement should be other than
> > behind bulkhead 706 (which is where Van's strongly recommends I put
> > them). Any comments and suggestions on this will be gratefully
> > received. Bill Albion, Maine
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
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