VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 09-12-2022, 05:13 PM
rondawes's Avatar
rondawes rondawes is offline
 
Join Date: Mar 2016
Location: Wylie, TX
Posts: 109
Default Flap pushrods

I'm not the builder.

I decided to replace my stock flap pushrods with the hex ones from Vans. I ordered them and received them with a sticker that says VA-256.

I finally got round to installing them and noticed that they are longer than the ones I have now. So either:

A. I'm supposed to cut them down to the proper length for my plane, or

B. I was shipped the wrong part for my plane.

I'd appreciate enlightenment. Thanks.
__________________
RV-7A N51DD
Based KTKI
Donation paid July 2022
Reply With Quote
  #2  
Old 09-12-2022, 05:24 PM
pazmanyflyer's Avatar
pazmanyflyer pazmanyflyer is offline
 
Join Date: Jul 2007
Location: Litchfield Park, AZ
Posts: 1,210
Default

Quote:
Originally Posted by rondawes View Post
I'm not the builder.

I decided to replace my stock flap pushrods with the hex ones from Vans. I ordered them and received them with a sticker that says VA-256.

I finally got round to installing them and noticed that they are longer than the ones I have now. So either:

A. I'm supposed to cut them down to the proper length for my plane, or

B. I was shipped the wrong part for my plane.

I'd appreciate enlightenment. Thanks.
The hex pushrods are a part from the 9 model which are a little longer than called out for the pushrods on the 7. Trim them down to the specified length per the 7 plans.
__________________
Carlos in Arizona
EAA Chapter 538 www.chapters.eaa.org/eaa538
Wittman Tailwind W8 N53CH (built & sold)
Pazmany PL-1 N2029 (bought & sold)
RV7 - N537TC (reserved & building)
Emp, Wings & Fuse done - working on FWF

"The air is an extremely dangerous, jealous and exacting mistress. Once under the spell most lovers are faithful to the end, which is not always old age." - Winston Churchill
Reply With Quote
  #3  
Old 09-12-2022, 05:29 PM
PaulvS's Avatar
PaulvS PaulvS is offline
 
Join Date: Aug 2019
Location: Western Australia
Posts: 1,192
Default

What is the reason for changing from the original push rods? Is there a problem with the design or the specification?
__________________
Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, fuselage almost done, working on canopy.
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
Reply With Quote
  #4  
Old 09-12-2022, 05:32 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 2,356
Default

Was the part number you ordered different than the part you received? If so, send it back and get the correct one. If they have a one size fits all for this part, you may have to trim it to fit your airplane. If you do that, make sure the thread depth in the newly trimmed part is deep enough to accept the rod bearing. If you have to drill deeper, make sure you use the right drill size for the tap you are using - not sure if itís 10-32 or 1/4-28. The drill size is smaller than the tap size - donít have the chart with me, but easy to find out.

The hex rods are an improvement, not only in strength, but also in installation of the bearings and stop nuts.
__________________
SH
RV6/2001 built 2000/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019/sold2021
RV6/August 2022 build - Phase 1
Cincinnati, OH/KHAO
JAN2022
Reply With Quote
  #5  
Old 09-13-2022, 05:39 AM
Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 1,257
Default Hex rod improvement ?

My 2009 3B kit had hex rods. My 1999 RV4 kit has round rods. What is the shortcoming of of the round rods if you follow air speed suggestions for flap deployment ? I can easily replace them, just wondering why bother.
__________________
Larry DeCamp
RV3B sold
RV-4 fastback in process w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
Reply With Quote
  #6  
Old 09-13-2022, 08:24 PM
andoman andoman is offline
 
Join Date: Jul 2006
Location: Payson, AZ
Posts: 76
Default

The loads on the 9’s larger flaps necessitate the more robust hex rods.
The standard rods are fine but have less margin should a flap over speed occur.
The standard rods are also less forgiving of poor fabrication or wear from interference where they exit the fuselage. Some have failed resulting in a split flap condition.
__________________
"The plane won't build itself..." RV-7A N7.62MM sold
-RV4 purchased. Extensive refurbishment complete. ďTakes off by itís self, flys hands off, lands by itís self...Ē
-HRII project: paint and panel to go!
Reply With Quote
  #7  
Old 09-13-2022, 11:09 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 1,320
Default

When you shorten the new hex rods, take an equal amount from each side. This will prevent you from having all the excess taken off one side and being left with a shallow threaded hole on that end. Also check that the larger diameter doesnít rub in the fuselage holes.
__________________
Tom
Las Vegas
RV-4 flyingÖ
RV-8 empenage finished 10-2020

Wings Started.. 11-2020
Reply With Quote
  #8  
Old 09-13-2022, 11:45 PM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 4,868
Default

If I recall correctly, these can also be obtained from Mcmaster-Carr in a lot of different lengths. I bought some but didn't install them.

https://www.mcmaster.com/catalog/128/3591
__________________
Mickey Coggins

http://www.rv8.ch/help-people-in-ukraine/

Last edited by rv8ch : 09-13-2022 at 11:50 PM.
Reply With Quote
  #9  
Old 09-14-2022, 05:14 AM
swisseagle's Avatar
swisseagle swisseagle is offline
 
Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 520
Default

Ok, you did not build it, but you are the owner. So buy a set of planes to identify the correct numbers of each part.

If you order another part than in the plans, make them at least the same functional size, length in this case.

History: The 7 has a rigid AL tube, that you cut to length and cut a thread on each side. The problem with the strength was when the builder was cutting the thread not in a lathe ... freehand or however not aligned with the tube. Or the cutout in the fuselage was not enough big and during taxi on the bumpy field, the tube was quickly compromised. Then use the 9 flap rods, but you must shorten them. As others mentioned, equal on each end.
__________________
Dominik

RV-7A, TMX-IO-320, FM-150, WWA 200RV
Flying since 28. April 2016
Reply With Quote
  #10  
Old 09-14-2022, 05:37 AM
catmandu's Avatar
catmandu catmandu is offline
 
Join Date: Dec 2005
Location: Sierra Nevada
Posts: 1,069
Default

Quote:
Originally Posted by Larry DeCamp View Post
My 2009 3B kit had hex rods. My 1999 RV4 kit has round rods. What is the shortcoming of of the round rods if you follow air speed suggestions for flap deployment ? I can easily replace them, just wondering why bother.
Suggestions are just that. If one were to ignore the suggestions (perhaps on climb out) because of the ludicrous acceleration one enjoys with an RV, but one then wonders why normal cruise speed cannot be obtained on a particular day, the round rods might not have to be replaced, but the hex rods might be installed to future proof.

Not that I'd know.
__________________
Mike C.
Sierra Nevada
RV-6A bought flying (for sale)
Super-8 bought flying
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 05:00 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.