Home > VansAirForceForums

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

- Today's Posts | Insert Pics

Old 07-02-2017, 07:21 AM
Reflex Reflex is offline
Join Date: Jan 2015
Location: Kansas
Posts: 102
Default Air Pressure - AN470AD4-7

I'm having a bit of trouble setting the rivets in the picture below. It appears that I'm not using enough air pressure in my 3X gun. Wondering if anybody remembers what they used. Currently trying to use a double offset with a 1.6 lb. tungsten bar.

Currently using 45 psi. Seems that I may need significantly more pressure. Thought I'd ask before I jack the pressure up and risk "engraving" the spar with smilies.

For those that can't quite picture what I'm working on, it's the final rivets on the HS stab for an RV-14.

Many thanks,

Dues Paid for 2019
Empennage Complete
Getting Ready to Close Wings
Reply With Quote
Old 07-02-2017, 07:25 AM
M McGraw's Avatar
M McGraw M McGraw is offline
Join Date: Dec 2012
Location: Greenback, TN
Posts: 433
Default Air pressure

In general I used 40-45ish for AN3 and 60ish for AN4.
Marvin McGraw, 5TN4
RV-14. #140039 Complete
Flight hours: 250+
2018 Dues Paid
Reply With Quote
Old 07-02-2017, 07:45 AM
DaleB's Avatar
DaleB DaleB is offline
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,990

I found that a long double offset has a lot of mass, and needs more pressure than you'd think. There were places where I had to use it, but I tried to find other ways whenever I could. I don't remember specifically how much pressure I had to use, but the exact number would vary depending on the gun and other factors anyway. Don't be afraid to crank it up to get the result you need.

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
Reply With Quote
Old 07-02-2017, 10:38 AM
kiljoy's Avatar
kiljoy kiljoy is offline
Join Date: Sep 2014
Location: Alameda, CA
Posts: 106

I shot those rivets the other day. I had to use a long offset rivet set extension to get to them. The thing I had to remember is to not tighten up the rivet set all the way down. Even then I had to set my PSI to 60 and it still took 5-7 seconds of bucking to get them down.
Dues paid (2019)
RV-14 #140394
Empennage - done(ish)
Wings - done(ish)
Fuselage - Crating late Jan. 2019
YouTube Build Channel
Reply With Quote
Old 07-02-2017, 12:06 PM
MED MED is offline
Join Date: Jul 2015
Location: Aiken, SC
Posts: 339

Used a double offset set in a #3 gun, 60#, and a small tungsten bar. Worked great.
Reply With Quote
Old 07-02-2017, 12:38 PM
Polar Polar is offline
Join Date: Oct 2013
Location: Central Alberta
Posts: 63

I ended up buying a 12" straight set to get into those. I set the first rivet with an offset, but didn't like how much pounding it took to get a good shop head. The long straight set made quick work of it
Reply With Quote

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 03:21 PM.

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.