VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-7/7A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 04-01-2010, 05:13 AM
rhill rhill is offline
 
Join Date: Feb 2006
Location: Valley Forge, Pa
Posts: 604
Default 0-360 on a 0-320 engine mount question?

Has anyone used a 0-360/Catto three blade mounted by a longer(2") engine mount to counter Weight & Balance issues on a 7a tip up? If so what cowl have you used? what would you do differently? etc... I am not crazy about added weight, especially if it's rotating, I am even more apprehensive of aft CG as I have an hour in a 7 with two big guys and low fuel, Pitch sensitivity is disturbing.
Reply With Quote
  #2  
Old 04-01-2010, 08:30 AM
cjensen's Avatar
cjensen cjensen is offline
 
Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,963
Default

I have on O-360 on a 320 mount on my 7/TU with a three blade Catto. I haven't weighed yet, but I suspect I'll be fine seeing as thought the 320 mount is designed with the use of a constant speed prop in mind. My overall engine/prop combo weighs less than the 320/CS combo.

I did have to have Will James make me a special length cowl, but it didn't cost any additional. I will have some "special" 'glass work to take care of at some point because of the additional length, but that can be dealt with easily enough.

I wouldn't change a thing at this point, and like I said, I do believe my WB numbers will be good...
__________________
Chad Jensen
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
Vertical Power - Astronics Advanced Electrical Solutions division
920.216.3699

chad.jensen@astronics.com
Reply With Quote
  #3  
Old 04-01-2010, 08:53 AM
rhill rhill is offline
 
Join Date: Feb 2006
Location: Valley Forge, Pa
Posts: 604
Default

Thanks Chad, What were the fit problems for the std Vans Cowl? 0-320 vs0-360? Did you use the Saber 2.25" ? Light or heavy crush plate? What
is your choice of ignition systems?
Reply With Quote
  #4  
Old 04-01-2010, 10:16 AM
cjensen's Avatar
cjensen cjensen is offline
 
Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,963
Default

Reiley is right...the 235/320 cowl won't work, it's too narrow, and too short for a 360. I don't know anything about the std 360 cowl from Van's other than the fact that Gus told me the carb inlet scoop would need to be cutoff and re-grafted on the cowl in a more forward position. I never planned to use the Van's cowl, so Will James just made me one that would work. The way I understand it tho, is that either cowl would need to be lengthened to work with a 360, and the SJ cowl scoop didn't need to be modified.

I used the standard 4" extension from Saber for the 360/Catto combo. Works fine. The crush plate is the 7" one, 1/2" thick.

I have one mag, one Lightspeed Plasma II+.
__________________
Chad Jensen
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
Vertical Power - Astronics Advanced Electrical Solutions division
920.216.3699

chad.jensen@astronics.com
Reply With Quote
  #5  
Old 04-01-2010, 10:37 AM
LifeofReiley's Avatar
LifeofReiley LifeofReiley is offline
 
Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,776
Default

I would think that there would be enough trim material on the 360 cowl not to cause you any issues. Even on the 235-320 cowl there is a lot of material to trim off the back when fitting the cowl. I do know one thing you will like is having the 2" 's of extra room behind the engine. You can absolutely get to everything with ease.
__________________
Reiley
N622DR - Serial #V7A1467 RIP Aircraft Drowned in the 05/2015 Memorial Day Flood
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
Reply With Quote
  #6  
Old 04-01-2010, 01:25 PM
cjensen's Avatar
cjensen cjensen is offline
 
Join Date: Jun 2005
Location: Milwaukee, WI area
Posts: 2,963
Default

Quote:
Originally Posted by LifeofReiley View Post
<snip>I do know one thing you will like is having the 2" 's of extra room behind the engine. You can absolutely get to everything with ease.
+1

__________________
Chad Jensen
RV-7, 5 yr build, flew it 68 hours, sold it, miss it.
Vertical Power - Astronics Advanced Electrical Solutions division
920.216.3699

chad.jensen@astronics.com
Reply With Quote
  #7  
Old 04-04-2010, 12:35 AM
rhill rhill is offline
 
Join Date: Feb 2006
Location: Valley Forge, Pa
Posts: 604
Default

Thanks Guys, I will check with Van's, Sounds like a 0-360FI cowl with a carburetor scoop grafted on the right location might be the way to go.
I would think Van's would have thought of this and worked something out by now.
I waited ten years for a Lycoming to fall off a turnip truck ,I never dreamed it
would be a 0-360, all my plans are based on 0-320, light weight, Catto three blade . I will trade off 21 extra pounds/20 to 30 more ponies for more fiberglass
work any day, I cant help thinking there is more to this than that.
Reply With Quote
  #8  
Old 04-04-2019, 04:21 PM
DavidHarris DavidHarris is offline
 
Join Date: May 2018
Location: Upland, CA
Posts: 6
Default IO-360 Engine on 320 mount

Picking up a long-dormant thread.

I am building a Vans RV-7A with a Superior XP-IO-360-A1HC2 engine and a Catto 3-blade fixed-pitch prop. I purchased the Vans finishing kit with the 360 engine mount (WD-739-PC), 360 cowling, and the spinner for the wooden prop. I am also getting the 2.25" saber extension.

Saber told me that the plane is likely to be tail heavy and recommended the 20-pound crush plate on the prop. It pains me to be building light and to buy a spiffy light composite prop and then put 20 pounds of crush plate on to fix the CG.

I've seen this thread about using a 320 engine mount to push the 360 engine forward and improve the CG. One of my friends met a Vans engineer at a fly-in and understands the engineer is doing this on his plane. But another builder tells me he called Vans and was told Vans has no cowling that will work with an IO-360 engine that far forward.

This thread is old and I'm wondering what the latest news is. If you have built a RV-7 with an IO-360 engine on a 320 engine mount, I'd like to hear how it worked and whether you had cowling issues.

Thank you,

David
Reply With Quote
  #9  
Old 04-08-2019, 10:41 AM
bizpilot bizpilot is offline
 
Join Date: Sep 2015
Location: Falmouth Airpark, Mass (Cape Cod area)
Posts: 13
Default

Has anyone mounted a Concord RG25 on the firewall of their RV 7/7A to address the aft CG issue when using a light weight Prop? Seems like a more useful way to move the CG forward, than a crush plate. Assuming it fits of course.
Bob Bisbee
Reply With Quote
  #10  
Old 04-08-2019, 10:55 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 8,114
Default

Quote:
Originally Posted by bizpilot View Post
Has anyone mounted a Concord RG25 on the firewall of their RV 7/7A to address the aft CG issue when using a light weight Prop? Seems like a more useful way to move the CG forward, than a crush plate. Assuming it fits of course.
Bob Bisbee
The original RV-9 plans were for a battery tray that fit a standard 25 size battery on the firewall because the Odysee wasn't in common use then, so it could be done.
If you do the W&B computations though, I think you will find that it helps much less than a weight out on the front of the prop. because the firewall is not very far fwd of the CG by comparison.
__________________
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 12:11 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.