VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics

  #1  
Old 08-10-2018, 04:59 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 2,437
Default Cummins spinner fit issue

I was wondering if anyone else has had any issues fitting a Commins spinner. With the front plate installed, my spinner does not go far back enough for the aft edge of it to be flushed with the aft edge of the back plate by around 0.062”. Now best I can tell the aft edge of the front plate is preventing from going farther back. This is with a Harzell CS prop in a RV14

I was wondering if anyone else has had this issue and if so how did they fix it.
__________________
Mehrdad
RV7A - IO360M1B - SOLD
Dues paid

Last edited by Bavafa : 08-10-2018 at 05:06 PM.
Reply With Quote
  #2  
Old 08-10-2018, 05:13 PM
jeffw@sc47's Avatar
jeffw@sc47 jeffw@sc47 is offline
 
Join Date: Aug 2014
Location: Simpsonville, SC (SC47)
Posts: 213
Default

My Cummin spinner went on just like yours. I accepted that it was the best it would do.

The back plate still clears the front of the cowling by about 3/16".

I guess it's not perfect, but so are lots of other things.
__________________
Jeff Warren
Simpsonville, SC (SC47 - 10nm NW Triple Tree, SC00)
1946 Bellanca Cruisair 14-13-2 (72 YRS OLD 8/15/18)
RV14A (N14ZT), Ser#140195
Start 10/11/14
Dues paid 12/1/17 (USArmy 2/67-2/70)
www.mykitlog.com/jeffw@sc47

!! I SURVIVED RIPON ARRIVAL - KOSH 7/21/2018 !!
Reply With Quote
  #3  
Old 08-10-2018, 05:20 PM
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,062
Default

This is mine installed a few years ago. Hope this helps. It too was little short but
works well
__________________
Larry
Reply With Quote
  #4  
Old 08-10-2018, 08:45 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 2,437
Default

Thank you guys, looks like at least two people with the same issue.
It does not look to be a safety issue with edge distance, only cosmetic I guess.
__________________
Mehrdad
RV7A - IO360M1B - SOLD
Dues paid
Reply With Quote
  #5  
Old 08-21-2018, 06:24 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is online now
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,664
Default

I did a trial fit of the spinner tonight, both front and back plates installed. As was previously posted, it was perhaps 1/16” short of being flush with the backplate.

The first photo shows the Hartzell diagram on using spacers and washers. I started out with the spacer and one washer between the spinner backplate and the prop hub - this yielded the previously reported 1/16” short problem. I then used just the spacer and the spinner is now flush with the backplate.

Do this fit up before you follow the Cummin video on drilling holes and such for spinner screws.

Carl


Reply With Quote
  #6  
Old 08-21-2018, 07:29 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 2,437
Default

Quote:
Originally Posted by Carl Froehlich View Post
I did a trial fit of the spinner tonight, both front and back plates installed. As was previously posted, it was perhaps 1/16” short of being flush with the backplate.

The first photo shows the Hartzell diagram on using spacers and washers. I started out with the spacer and one washer between the spinner backplate and the prop hub - this yielded the previously reported 1/16” short problem. I then used just the spacer and the spinner is now flush with the backplate.

Do this fit up before you follow the Cummin video on drilling holes and such for spinner screws.

Carl


Carl,
Thanks for reporting. I have also removed the extra washer and that improved it but there is still the 1/6+ discrepancy for mine.
__________________
Mehrdad
RV7A - IO360M1B - SOLD
Dues paid
Reply With Quote
  #7  
Old 08-22-2018, 06:17 AM
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,062
Default

That washer is there for clearance between the blade and bulkhead when blade is at full travel. DO NOT recommend removing the washer.
__________________
Larry
Reply With Quote
  #8  
Old 08-22-2018, 07:25 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is online now
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,664
Default

Quote:
Originally Posted by Larco View Post
That washer is there for clearance between the blade and bulkhead when blade is at full travel. DO NOT recommend removing the washer.
I thought of this, but at first blush clearance looked ok. I’ll do a full blade travel clearance check later today and report back.

Carl
Reply With Quote
  #9  
Old 08-22-2018, 08:39 AM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 2,437
Default

Quote:
Originally Posted by Larco View Post
That washer is there for clearance between the blade and bulkhead when blade is at full travel. DO NOT recommend removing the washer.
Can you please be more specific about the bulkhead. I did a full blade movement and did not notice any interference.
__________________
Mehrdad
RV7A - IO360M1B - SOLD
Dues paid
Reply With Quote
  #10  
Old 08-22-2018, 08:42 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is online now
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,664
Default

I sent a note to Allan at Cummins Spinners on the issue. He tells me he is looking at the issue and will offer a fix to those that purchased the spinner.

Carl
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 06:44 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.