Posted Tuesday, April 3, 2018 @ 03:46 AM
Hi again JC,
Small world indeed. I bought our Champ in 1988 from Steve Herrin, who then flew with Northwest and sold it planning to buy a Cessna 170. I don't suppose you know him? If so, please say 'Hi' and 'Thank you' and tell him we're still flying and loving it.
There's some info on my auxiliary tank installation here http://sbeaver.com/cgi-bin/fournier/cutecast.pl?session=PvoUsJecmQ7b0JvaDyWK9UoKbf&forum=11&thread=1019&page=2
I know the RF5 has wing tanks rather than the RF4D's forward fuselage tank, but you could probably rig up a similar bladder on the parcel shelf feeding into either one of the wing tanks or into the system somewhere via a union. The secret with the RF4 one is to get a longer banjo bolt made, then it all plumbs in neatly. I prefer gravity feed as mine is, because of the possibilities of pump failure and sparks with fuel.
Be sure to get a bladder tank that is resistant to all types of fuel, and not a water one, which will dissolve at the seams.
Good luck, Bob
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Flying and displaying Fournier RF4Ds VH-HDO and G-AWGN, building replica RF6B G-RFGB and custodian of RF6B prototype F-BPXV