Stuka Stunt Main Forum · 10 of 10 known posts recovered
De Hill
George
When the character of a man is not clear to you, look at his friends.
Japanese Proverb
Rob Johnson
Orange,CA.
Rob Johnson
Orange,CA.
Rob:
Are these the result of jobs that have been lost "offshore?" Are they made by little old ladies from Lithuania? HOW do you fill the hole so you can redrill, and what does your drill jig look like? Thanks.
Carl
"I don't know about this tuned pipe business. I practiced on that thing until my lips turned blue, and I still can't play a stinkin note."
"Homer J. Simpson"
Milton Graham\Proparc
Perhaps those APC props are for engines with bent shafts. 
On a serious note, thanks for the heads-up. Keep us posted on APC's reply.
George
Verrrrry interesting!Is the hole off center or is the counterbore off center or are both off center?In what direction?Make a jig to re-bore them on center.If the number of complaints I hear is indicative,you have another cottage industry,tuning APCs to make them do what they should have done in the first place.Whaddaya know,another prop kit.
Ron B.
As the APC line in general is of such high quality, and I had never had problems with the larger sizes, Rob's deal about 1/2A APC props seemed either mistaken or trivial. I was wrong.
First, Rush might be an inordinately picky sort, but as I have known him for many years his post pretty much got my attention.
Secondly, over the past couple months I have noticed that some of my APC 9-4s were as expected: slightly off in balance, but predictable in that the same blade was always heavy. However, two or three were way off and not to the expected side. One of them was so bad it was instantly thrown in the trash just so it wouldn't get used accidentally.
In checking the remaining props which took more than casual work, the drilled holes are indeed not centered.
Calling around to a couple of my Arcey friends this is indeed sometimes a problem. Some, mostly Pylon racers, use machined inserts in the molded recess to accurately center the props, neatly bypassing the drilled holes. See Darrol Cady's site (pitch gauge thread) for their solution.
Others take the option suggested on this thread, machining a drill guide which indexes to molded recess on back side of prop. In many cases factory-drilled hole is too small, so it can be both drilled centered and up to shaft size of the engine in one step.
The real answer, of course, is for APC to upgrade the tooling for drilling prop holes to the same level as seen in the design and construction of their props.
Dan