VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 07-07-2018, 10:11 AM
Hartstoc's Avatar
Hartstoc Hartstoc is offline
 
Join Date: Aug 2017
Location: Sebastopol,CA
Posts: 122
Default Kissing the belt-driven alternator goodbye forever-

I thought some of you might take interest in the process of complete removal of the belt-driven alternator from my RV-7A, including the drive pulley cast into the Lycoming flywheel. This link will take you to a photo album with detailed captions illustrating that process and discussing some of the many advantages.

https://public.fotki.com/Hartstoc/go...ven/?view=roll

I now have about 20 trouble-free hours on the installation above, and about 45 hours on the awesome B&C BC462-H spline-driven alternator with custom cooling shroud that made this all possible. That earlier story can be found here:

http://www.vansairforce.com/communit...hlight=Bc462-h
__________________
Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2018 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"

Last edited by Hartstoc : 07-07-2018 at 12:57 PM.
Reply With Quote
  #2  
Old 07-07-2018, 11:48 AM
Gash's Avatar
Gash Gash is offline
 
Join Date: Aug 2009
Location: Goodyear, Arizona
Posts: 702
Default

I enjoyed reading your write ups and seeing the photos. Very interesting stuff here Otis. Thanks for sharing!
__________________
Karl, Goodyear, Arizona (KGYR)
RV-7, Flying
Extra 330LX, Flying
RV-8, Sold
Bearhawk 4-Place, Sold
=VAF= donor 2018
Reply With Quote
  #3  
Old 07-08-2018, 10:30 AM
Hartstoc's Avatar
Hartstoc Hartstoc is offline
 
Join Date: Aug 2017
Location: Sebastopol,CA
Posts: 122
Default

Quote:
Originally Posted by Gash View Post
I enjoyed reading your write ups and seeing the photos. Very interesting stuff here Otis. Thanks for sharing!
Thanks for the kind words! I’m certainly grateful for all the experience shared by others on VAF, and the feedback and questions generated in response to my own posts here can be priceless and completely worth the effort. What a great venue!
__________________
Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2018 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"
Reply With Quote
  #4  
Old 07-08-2018, 12:30 PM
MConner MConner is offline
 
Join Date: Mar 2018
Location: Snead Island, Florida
Posts: 80
Default

I like this idea for moving some weight aft on my nose-heavy RV-10. Do you have any weights for the pulley and belt. Is there much diffence in weight from a PP to the pad mounted unit?

Mark
40# ballast when solo.
Reply With Quote
  #5  
Old 07-08-2018, 12:42 PM
Toobuilder's Avatar
Toobuilder Toobuilder is offline
 
Join Date: Jul 2009
Location: Mojave
Posts: 4,061
Default

Considering the heft and location of the brackets and hardware for the belt driven version, going to the pad mounted example is probably a noticable moment change on the 540.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
______________
Harmon Rocket II -SDS EFI instalation in work
RV-8 - Flying
1940 Taylorcraft BL-65 -flying
Reply With Quote
  #6  
Old 07-08-2018, 01:10 PM
MConner MConner is offline
 
Join Date: Mar 2018
Location: Snead Island, Florida
Posts: 80
Default

Agreed, the length of the motor moves the heavy alternator a long way forward. I saw the weight totals in the article. The process would be very simple if one left the pulley as is. No prop to pull and no mill work. I wonder what the pulley weighs?

Mark
Reply With Quote
  #7  
Old 07-08-2018, 04:22 PM
Hartstoc's Avatar
Hartstoc Hartstoc is offline
 
Join Date: Aug 2017
Location: Sebastopol,CA
Posts: 122
Default

Quote:
Originally Posted by MConner View Post
I like this idea for moving some weight aft on my nose-heavy RV-10. Do you have any weights for the pulley and belt. Is there much diffence in weight from a PP to the pad mounted unit?

Mark
40# ballast when solo.
The pulley and belt amount to about 1.5#, but as someone noted the brackets, not to mention the heavy guage cable to the nose, and the alternator itself adds up. My brackets were aluminum, but many are heavy steel. Btw this IS covered in the captions under the photos, so if you mised those there is a lot of info there. My total removed was about 11.5#, whereas the pad-mount BC462-H weighs about 7.5 and is almost 24” further aft. If an honest 42 Amp alternator(45max) will serve your needs, then I recommend it highly. The custom cooling shroud that I built adds about 1/2 pound, but well worth it for the peace of mind of KNOWING that it is always operating in a super-benign environment. Please do go to that thread if you are considering conversion to the pad mount.

Sublty shifting my empty weight CG aft a bit is actually an intentional part of my overall plan. I’ll be starting a thread on this topic at some point- but if you want the most nimble RV possible, one that handles like a mid-engine sports car, you should bethinking about reducing polar mass AND dialing in your empty weight CG for a mid-aerobatic-envelope when flying solo with a light fuel load. The lightweight composite prop blades and the Alternator swap both provided me with these benefits, and my 7A handles like an Acura NSX as a result. For those interested, I reverse-engineered my EW CG to 80.5”. This still allows an aerobatic instructor and half tanks in the aerobatic envelope, or for me, my wife, 100# of baggage, and full-to-empty tanks to be wilthin the normal category envelope. Too-forward CG’s make for boring airplanes.- Otis
__________________
Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2018 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"

Last edited by Hartstoc : 07-08-2018 at 09:04 PM.
Reply With Quote
  #8  
Old 07-08-2018, 05:48 PM
RV8JD's Avatar
RV8JD RV8JD is offline
 
Join Date: Jan 2005
Posts: 863
Default

Quote:
Originally Posted by Hartstoc View Post
... and my 7A ... This still allows ... for me, my wife, 100# of baggage, and full-to-empty tanks to be wilthin the normal category envelope.
Just to be accurate, if that is within the Van's recommended GW of 1800 pounds, it would be in the Utility category.

Nice job on the alternator mod!
__________________
Carl N.
Arlington, WA (KAWO)
RV-8, 370 Tach Hours
(Pic 1),(Pic 2)
- Out with the Old, In with the New
(Pic)
RV-8, 1938 Tach Hours (Pic 1),(Pic 2) - Sold

Glasflügel Standard Libelle 201B, N564NS - Sold
Rolladen-Schneider LS1-f, N61MP - No longer owned
Reply With Quote
  #9  
Old 07-08-2018, 06:08 PM
Hartstoc's Avatar
Hartstoc Hartstoc is offline
 
Join Date: Aug 2017
Location: Sebastopol,CA
Posts: 122
Default

Quote:
Originally Posted by RV8JD View Post
Just to be accurate, if that is within the Van's recommended GW of 1800 pounds, it would be in the Utility category.

Nice job on the alternator mod!
I stand corrected, utility category! It wasn’t necessary, but I’d have been willing to accept as low as an 85# baggage limit to achieve my “nimbleness” goals, but fortunately my wife and I combine to less than 300#, so thanks to Van’s incredible design, no sacrifices were required! An added advantage for the “A’s” is that moving to a slightly more aft EW CG target reduces nose wheel weight in all loading configurations. It DOES mean that you have to be slightly more on the ball as a pilot, and I would never consider violating Van’s published CG envelope in any loading configuration, not even by a little bit.
__________________
Otis Holt-
RV-7A (bought)
Built Monnett Moni
Frmr Test Pilot/Author CAFE APR's:
RV-8A, S-7C, Europa, Glastar.
-2018 VAF donation!!-
"RV-Fun is inversely proportional to RV-Weight!"

Last edited by Hartstoc : 07-08-2018 at 09:18 PM.
Reply With Quote
  #10  
Old 07-11-2018, 12:53 PM
dwranda dwranda is offline
 
Join Date: Jan 2015
Location: Jamestown,NY
Posts: 332
Default

Has anyone done this on an IO360 with the 90 degree oil filter adapter? I'm wondering if there is room for the alternator next to the filter.
[IMG][/IMG]
__________________
9A in progress
Working on Finish kit!!
Mattituck TMXIO-360 red gold
Dues paid Dec 17
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 10:37 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.