Hi Tom. That's interesting .... I have had the same problem with our Dimona. It was caught just prior to breaking. The manufacturing quality was really bad. I think it had been bent in a vice as you could see the vice jaw marks. I made another one using a piece of 4130 steel , made twice the length of the bend and bent it over a mandrill. Of interest, the person I "scrounged: the piece of 4130 from is the builder of the Mosquito wooden airframes. His workshop is just up the road from us. They are currently producing the 5th fuse from the moulds
Kind regards Ian Williams Tel: +64-21-980-194 *** Please note our new email address *** > On 6/06/2018, at 8:00 AM, Tom Preisser <[email protected]> wrote: > > Hi all, > > I always reach in the engine compartment and tug on the engine tension cables that resist the motor's thrust as part of my pre-flight. This morning all was well on the left side, but on the right side I felt nothing, because it was lying on the engine compartment floor. The steel 45 degree tab that anchors the turnbuckle and attaches to the firewall had failed completely, broken in half, apparently some time during the previous flight (probably taxiing on bumpy tway Charlie). Several hours before I had noticed a loosening of that cable and had adjusted the turnbuckle accordingly and tightened the through-firewall bolt which holds the tab, under the assumption that the looseness had been caused by the tab having rotated slightly. In fact, it appears that was the beginning of the end for that tab. The factory had put a rather sharp bend in this piece of steel (spec: 1.7734.1) - perhaps without normalizing afterward. This is an original piece with 1700 hours on it (and not itself a life-limited part, unlike the silent blocks and the turnbuckles and tension cables). I recommend that if you detect any looseness in your cables that you inspect the tab closely! I have replaced it using a piece of mild steel that is 3 mm thick rather than the original 2 mm. > > Regards, > > Tom > <WP_20180603_11_35_10_Pro.jpg> > <WP_20180603_11_35_27_Pro.jpg> > <WP_20180603_11_35_33_Pro.jpg> > <WP_20180604_16_01_55_Pro.jpg> > > --------------------------------------------------------------------- > You are subscribed to the Dimona Owners Group mailing list. > To unsubscribe, send email to: [email protected] --------------------------------------------------------------------- You are subscribed to the Dimona Owners Group mailing list. To unsubscribe, send email to: [email protected]
