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| Subject: Wing Tanks | |
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Author: Bob P |
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Date Posted: Sat, Jun 29 2013, 11:14:09 GMT In reply to: Lee 's message, "Re fuel leaks" on Sat, Jun 29 2013, 9:57:45 GMT I wouldn’t worry too much about the wing tank sealant flaking, as any bits you can’t get off will be bonded in place when the new tank sealant is applied. Some tank sealants were designed originally to be used to repair metal motorcycle/car fuel tanks that leaked or where rust flakes clogged up the fuel system. I guess that a bendable lance (10mm aluminium/copper tube?) on the end of a compressed air line could be used to blow off the worst of the loose bits. It is important that the tank is properly sealed as most mogas contains ethanol which eats epoxy resin - and there are dire warnings about running the 582 on avgas (the lead causes early plug failure). The sealant you use must be ethanol proof (eg Kreem). Ethanol loaded mogas is not currently approved in group A aircraft engines so that leaves UL91 fuel. BP Ultimate (also not approved as it is premium rather than EN228 regular mogas) is (round here) also lead free. I read somewhere that an early batch of composite spar wings were defective and withdrawn, so it might just be worth checking that your Pulsar does not have these – I guess if it has the later fuel resistant wing ribs it will also have a later spar but perhaps worth checking. Perhaps Alan knows how the defective spars can be identified? The front of the fuselage fuel tank is formed by the (roughly) top third of the engine firewall and extends back to a bulkhead parallel to and about 30cm in front of the control panel. The upper fuselage between these two bulkheads forms the top and sides of the tank, and the floor of the tank is formed from two slabs of composite forming a wide angled Vee ( easily seen by peering under the control panel). The filler is mounted front-centre-top of the fuselage just behind the engine firewall. Personally I like the idea of wing tanks. Although then have the downsides explained by Rob, I’d prefer not to have the risk of 40 litres of fuel dropping on my lap in the event of a serious incident (I’m told this has never happened), and I guess MTOW can increase if the fuel is in the wings. If you advise where this Pulsar is housed perhaps a local Pulsar owner might be able to have a look at it for you. Bob P [ Next Thread | Previous Thread | Next Message | Previous Message ] |
| Subject | Author | Date |
| Re | Lee | Sun, Jun 30 2013, 21:11:56 GMT |
| Wing tanks | Alan Gill | Tue, Jul 02 2013, 18:45:26 GMT |