|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

06-14-2013, 10:44 PM
|
 |
|
|
Join Date: Jan 2007
Location: Battle Ground
Posts: 480
|
|
Thanks
Thank you to everyone who has responded to my questions. Several ideas were shared here, on other forums and through email. For those reading with the same questions I thought I would summarize some of the ideas and thoughts sent to me. In no particular order:
1. Using a Cato prop is lighter, but to avoid an aft CG in some configurations I will need a counter weight at the spinner. This does negate some of the weight savings of the lighter prop. Some have suggested moving baggage during low fuel conditions.
2. Using a 320 mount with a 360. Well the 320 cowling would probably work, but the scoop won't fit the 360 requiring removal and replacement of the scoop. I have not heard from anyone that has the 320 mount installed with a 360.
3. There is an option of extending the mount with spacers. This does move the landing gear forward slightly (RV-7.) I am not sure if that is an issue.
4. Of course there is always the CS option.
Thanks for you input.
Scott
__________________
Scott
RV-7 N818BG (flying)
Bearhawk Patrol (building)
|

06-15-2013, 12:24 AM
|
|
|
|
Join Date: Dec 2010
Location: Coal Point, Australia
Posts: 128
|
|
Quote:
Originally Posted by rhill
The 0-320 engine mount gives you an extra 2" forward. When ordering my finish kit Vans talked me out of the 0-320 mount so I ordered the 0-360 mount for the 0-360 core I'm building.Bob at Aircraft specialties talked me out of removing the inside plug when they yellow tagged the Crankshaft as it would hinder a CS conversion latter, I had the urethane coating applied and the outer plug installed,looks like they used a bead of clear silicone around the bore before installing the outer plug. I'm not there yet but want to acquire a 0-320 mount and will trade new for new or buy outright( whats another G at this point?). Point is 2" won't solve all the problem but is a far better alternative to adding weight. It's tough to argue with Vans or ACS and yes I need to consider any future owner as this project is an asset/liability and may need to go to a new home some day  . Has anybody done a 0-360 on a 7a with a 0-320 mount? If so I would like to talk about the numbers,what did it buy you in real world terms.
Bob
|
The plan for my -7 is o-360 (solid crank with original heavy accessories) Sensenich Alu FP. I want to be able to use all my baggage so was planning on using the 0320 mount even with the heavier Sensenich.
Not interested in CS, if future owner wants CS he's gonna have to do a engine transplant, while the engine is off not really a big deal to also change the mount.
That type of guy is also going to want injected so will be needing to do cowl mods as well.
I'm more likely to change from Sensenich to Cato etc rather than to CS.
My understanding is that you need to also get 0320 FF because you need the longer hoses with the longer 320 mount not the shorter o360ff.
I would be very interested in anyone's experiences with 320 mount 360 engine regardless model. How much longer is the 320 mount?
__________________
Regards,
Rob.
................__|__
......______(-o-)______
................./ ' \.
M: (61) 401 578 700
|

06-15-2013, 04:29 AM
|
|
|
|
Join Date: Feb 2006
Location: Valley Forge, Pa
Posts: 636
|
|
Quote:
Originally Posted by Vansrv7arob
The plan for my -7 is o-360 (solid crank with original heavy accessories) Sensenich Alu FP. I want to be able to use all my baggage so was planning on using the 0320 mount even with the heavier Sensenich.
Not interested in CS, if future owner wants CS he's gonna have to do a engine transplant, while the engine is off not really a big deal to also change the mount.
That type of guy is also going to want injected so will be needing to do cowl mods as well.
I'm more likely to change from Sensenich to Cato etc rather than to CS.
My understanding is that you need to also get 0320 FF because you need the longer hoses with the longer 320 mount not the shorter o360ff.
I would be very interested in anyone's experiences with 320 mount 360 engine regardless model. How much longer is the 320 mount?
|
Once you step off the Plans,your in custom turf. Chad Jensen Rv-7 did a 0-360 on a 0-320 mount with a Sam James cowl,Catto 3B and yes you will need custom(longer) hoses/cables,however everything else would be 0-360 like the baffle kit,if you use the 0-320 cowl you would need to move the scoop and I'm told this cowl is very tight on a 0-360 also there is a difference between upper & lower cowl's respectively.My understanding the 0-320 mount is 2" longer than the 0-360 mount.
My other point is Vans doesn't support what they call untested configurations so a call to Vans about this will frustrate you no end.Same with the fixed/CS argument CS is "more better" so everyone will push you in that direction.I'm set Catto 3B,0-360 carb,EI both,Tip up,7a & full anti-splat.I'm not going to argue with Vans or the guy who decides my Yellow tag issues but in the end I'll build what I want and can afford.
Bob
Last edited by rhill : 06-15-2013 at 05:05 AM.
|

06-15-2013, 06:36 AM
|
 |
|
|
Join Date: Mar 2006
Location: Evansville, Indiana
Posts: 661
|
|
Quote:
Originally Posted by bret
That is a good idea to move the mount, do you have pics of how you did that?
|
Aluminum spacers that Mike Zeller, of RV-8 Canopy Latch fame and local EAA Chapter 21 member, made for me.
And this is a picture of the Sabre 20 lb. crush plate and Landoll harmonic damper
The combination of the two has really tamed my RV-7A. She no longer wants to go down on her tail with full baggage, low fuel and two people on-board.
__________________
______________________
Steve Eberhart, W9JUQ
3EV - Evansville, IN
Where is Steve and the Sky Terrier?
RV-7A Slider, O-360 A1A, Catto 3 blade, 2 screen Garmin G3X Classic, GTN 650, Bionics APRS. FLYING since June 24, 2009
EAA Chapter 21
Last edited by newtech : 06-15-2013 at 06:38 AM.
|

06-16-2013, 08:00 AM
|
 |
|
|
Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
|
|
Quote:
Originally Posted by newtech
Aluminum spacers that Mike Zeller, of RV-8 Canopy Latch fame and local EAA Chapter 21 member, made for me.
And this is a picture of the Sabre 20 lb. crush plate and Landoll harmonic damper
The combination of the two has really tamed my RV-7A. She no longer wants to go down on her tail with full baggage, low fuel and two people on-board.
|
Thanks for the pics, that looks like a simple fix.
__________________
7A Slider, EFII Angle 360, CS, SJ.
|

06-17-2013, 06:18 PM
|
 |
|
|
Join Date: Feb 2005
Location: Bay Pines, FL (based @ KCLW)
Posts: 1,955
|
|
Quote:
Originally Posted by RVbySDI
The forward CG limit is 77.95 and the aft CG limit is 84.84 for the 9A.
There are some differences with CG between the 'A' models and the tail wheel models that need to be considered. I am sure a tail wheel model builder can chime in with their info. This is a data point that I hope will be useful to you and others though. Hope it helps.
P.S. David, saw your query about what battery is being used after I posted. I am using the Odyssey PC680 mounted on the firewall.
|
Here's my numbers as I've converted from an A to TW.
I also have the PC680 FW mounted battery.
Empty weight/CG Limit
A model
1096/80.71
TW model
1065/81.11
Please note that I did remove the cabin gear weldments. Some have opted to not do so.
__________________
Danny "RoadRunner" Landry
Morphed RV7(formally 7A), N20DL, PnP Pilot
1190+ hours
2019 Donation Paid
Last edited by roadrunner20 : 06-18-2013 at 07:15 PM.
|

06-17-2013, 08:36 PM
|
 |
|
|
Join Date: Jan 2005
Location: SC
Posts: 12,887
|
|
The first question to ask is, are you building a -7 or a -7A?
I ask because the A's tend to be tail heavy due to the location of the mains.
Granted I have a -9, not a -9A, and the CG is slightly different but I do have an O-360 and a two bladed Catto prop. My engine has the hollow crank (Who knows, I might want to add a CS prop someday.), dual P-mags (each is 1.5 lighter than a mag), a lightweight SkyTec Starter, PC680 mounted in the standard location, Sam James Cowl, Saber prop extension, etc.
The engine mount is 10? from the firewall to the dynafocal ring. (The mount for the old, small engine, was 12?)
This combination worked out great but the moral is to build the plane as light as you can and then add weight as you need it, if you need it.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
|

06-18-2013, 08:21 AM
|
 |
|
|
Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,563
|
|
Quote:
Originally Posted by N941WR
. . .the A's tend to be tail heavy due to the location of the mains.
|
Actually I think that might be the other way around. The tail wheel airplanes tend to be more tail heavy. Dan's info seems to support this with his C.G. shifting further back slightly after conversion.
Quote:
Originally Posted by DanLandry
Here's my numbers as I've converted from an A to TW.
I also have the PC680 FW mounted battery.
Empty weight/CG Limit
A model
1096/80.71
TW model
1065/81.11
|
|

06-18-2013, 10:40 AM
|
 |
Forum Peruser
|
|
Join Date: Jan 2005
Location: Austinville, Alabama
Posts: 2,458
|
|
W&B link
Quote:
Originally Posted by Brantel
|
Thanks for the reply, Brian. I'm not far enough along to be too concerned yet about the W&B decisions for my build, but it is nice to know what the CG limits are. Plus, I was not aware of the very useful link on Van's site that you provided. Looks like I need to spend more time cruising the factory web site. 
__________________
Don Hull
RV-7 Wings
KDCU Pryor Field
Pilots'n Paws Pilot
N79599/ADS-B In and Out...and I like it!
?Certainly, travel is more than the seeing of sights;
it is a change that goes on, deep and permanent, in the ideas of living." Miriam Beard
|

06-18-2013, 09:16 PM
|
 |
|
|
Join Date: Jan 2005
Location: SC
Posts: 12,887
|
|
Quote:
Originally Posted by RVbySDI
Actually I think that might be the other way around. The tail wheel airplanes tend to be more tail heavy. Dan's info seems to support this with his C.G. shifting further back slightly after conversion.
|
Nope, one data point doesn't make it so.
I checked the numbers from Dan C's old list of RV W&B's (I sure wish he had kept that one part of his site up.) and the average of the 36 -7's listed (w/o Egg engines) is 79.59" and the average of the 50 (again, w/o Egg engines) -7A's is 79.95", close to a 1/2" further aft.
Remember, with the A's, you have those heavy mains, brakes, wheels and tires behind the CG. With the tail draggers, you only have that little TW back there and it is not enough to offset the balance.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 03:27 AM.
|