6 cylinder surprise

[Blueadventures]

Definitely a good development; however will add a little weight which may be offset by the shorter less mass of the prop flange / spacer.

[johnm]

and this ............... I assume

 

 

[onetrack]

It's incredible what the machining abilities are, of the new types of cutting tips. Physical Vapor Deposition (PVD) and Chemical Vapor Deposition (CVD) coatings have revolutionised machining with their ability to cut like diamond-tipped tools without the level of breakage that DTT's suffer from. Cylindrical grinders have become obsolete today, as you can now acquire tips that will machine chrome like butter.

[facthunter]

Why would a billet Crank weigh More than a forged one? I can't see why it would have to. (refering back a little way). Nev

Edited April 30 by facthunter

[Blueadventures]

24 minutes ago, facthunter said:

Why would a billet Crank weigh More than a forged one? I can't see why it would have to. (refering back a little way). Nev

If question is about my posts reference to weight it was referring to the additional material at the forward end on the case (crankcase) that would allow for more distance between the two bearing there to add better support and that would mean the prop adaptor flange and its spacing to be shortened as explained by Paul.  I reckon you would enjoy a day or two in Pauls workshop; I know I would.  Cheers.

[facthunter]

Thanks. Often cranks have sections that are much weaker than the general section and that concentrates stress in those  areas. Poor design. Usually where a throw goes to a crank pin section. Billet is not really like a bit of grained timber as some imagine if it's rolled properly.  The ends of each rolled length should be discarded if there's any chance of a Scarf being there..  Nev

[BrendAn]

1 hour ago, Blueadventures said:

If question is about my posts reference to weight it was referring to the additional material at the forward end on the case (crankcase) that would allow for more distance between the two bearing there to add better support and that would mean the prop adaptor flange and its spacing to be shortened as explained by Paul.  I reckon you would enjoy a day or two in Pauls workshop; I know I would.  Cheers.

I have been there. Great bloke's . They do some brilliant work. The radial engines are a work of art.

[BrendAn]

On 27/04/2025 at 7:20 PM, GolfWhiskeyHotel said:

I follow this forum at irregular intervals , but given the latest news re: Jabiru Gen 4 , I thought "I wonder what everybody is saying".  So I came for a look.  Now I know what everyone is saying . NOTHING.  Not one post?  But People are being told

"Your engine will require a new crankshaft" , please join the queue.  Has no-one anything to say?   I hear that 3 or 4 hundred engines are involved. Worldwide.  Seems to me to be a postworthy subject wouldn't you think?

My aircraft is not involved of course, being a J160 with 912uls engine. (coming up to its third year and MARAP yet to be completed) . Happy Hours in the sky................ Geoff

 

Edited May 2 by BrendAn

[facthunter]

Recalls and extending warrantees are a good thing. Nev