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    Oil Cooler Damper Calculations

    Hello folks, Before I dive into understanding vibration and shock theory in the Lord Catalogue http://files.lord.com/pdf/44/PC6116_AerospaceandDefenseIsolator.pdf and fill out the engineering data questioner, does anyone have a suggestion for an oil cooler damper for the following installation...
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    Nut tensile required for forward horrozontal stab mount point

    This is the application in more detail. It is one of two the front attach point bolts for the tailplane.
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    Battery options

    Thanks all, I went for the Odyssey PC950 with its 45.3 WH/KG power density as opposed to the PC680 with 29.3 WH/KG. Will cost 2 KG and have to build a new hold down but 90 min at 20A rather than 30 for this fadec power plant is worth it I think. FYI, the PC950 is second only to the PC1100 for...
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    Nut tensile required for forward horrozontal stab mount point

    Epic as always Bill, after installation it is looking like the 66s have been a better call than 67s as the previous 65s were pretty much thread bound. So the MS21042-4 and MS21044-428A have the same number of threads while the 42s have a more tapered lead thread and the 44s are cut more...
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    Battery options

    Cheers Charlie. Any pointers on where to start looking for something with the same form factor as the Odyssey PC950 ER30 250mm 97mm 156mm
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    Nut tensile required for forward horrozontal stab mount point

    That sound like a great idea, any recommendation on items compatible with AN4 and 5 ply, are you supposed to wind them up to flat in winter? Any issues with point loading on the edges?
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    Nut tensile required for forward horrozontal stab mount point

    Great advice guys thanks, So the preference is for 1/8th Aluminum over 1/16 x 1.125" AN970 washers? I currently have the AN970 washers on the top. I will look into MS or NAS bolts in the 6.906" range. I could also use the flanged MS21042-4 self locking nuts with ~6000lb tensile. These are...
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    Battery options

    Thanks very much everyone, It looks like the manufacture recommend a 68uF 450V cap for smoothing the alternator in the event of a battery failure. I am liking the energy density of the PC950 as for only 2KG more I go from 30 min to 90min at 20A... I could also use a more forward CoG. Looking...
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    Battery options

    Spot on both of you. However we are protecting the ECU from alternator pulsed delivery in the event of a battery failure. So maybe one of these? 470 µF, 100 V, 8000hr @125°C or an array of 470 µF,47 µF and 4.7 µF to smooth a wider band of frequencies...
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    Battery options

    Thanks Dana, that looks like it gives me 30min max at 20A. Any thoughts on options for more AH? Also any thoughts on what speced capacitor to run across the battery to protect the ECU incase of battery failure?
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    Nut tensile required for forward horrozontal stab mount point

    Hi folks, we are looking to add an other 1/4" of 5ply on top of this doubler and struggling to get the right length AN bolts. If we use a thin series nut MS21083-428A with a min tensile strength of 2290lbs and one washer rather than two in the photo below then an AN4-66A will work we cant get a...
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    Battery options

    G'day folks, The ULPower engines require electricity to run and draw around 20A for the high pressure fuel pump ECU coil etc. In the event of an alternator failure I will need as much capacity as I can practically carry. I am thinking of using an AGM battery like this...
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    Best Prop Tip Speed?

    Likewise, I am also interested to understand the max thrust assertions of .88 and .92 mach tip speed in #96
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    Your Christmas Wish List....???

    Giggles, she is a friend of my step sister... NZ is a village. If you added producing an Oscar winning film about Jeannie Marie Leavitt to the list and offered her the lead that one may very well come true!
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    Your Christmas Wish List....???

    ...For conversations on the internet to be as touching and heartfelt as this one... you guys are great and this is one of the good places. ...HBA 'migration' to New Zealand? We have plenty of room for visitors. ...More mornings like this
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    Busa Powered Bearhawk LSA

    There are some interesting developments of this engine due to its HP potential which could translate to reliability at lower tune levels. No need to be wedded to the gearbox... or the block... or your wallet.. https://engineswapdepot.com/?p=45923 Note that 500hp = 40 hr race TBO...
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    Best Quotes

    Shiny ;) I had the fortune of taking the last shuttle crew sailing a while back. The nicest group of genius Firefly camaraderie I ever had the pleasure to meet. This is one that still resonates with me today and has actually had a real impact on my relationship with aircraft. "Know what the...
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    Best Quotes

    There is nothing more permanent than a temporary fix - Russian proverb In theory, there is no difference between theory and practice but in practice there is - Benjamin Brewster Live with a man 40 years. Share his house, his meals. Speak on every subject. Then tie him up, and hold him over the...
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    Torsional Vibration and Resonance - Basic Theory and Issues

    Another anecdote from the automotive world I remember talking to Bill about is in the Mazda B power train racing where I have seen multiple examples of race track reliability for years with gearboxes being run at double the factory torque specs only to destroy two gearboxes in one weekend after...
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    Crankcase evaucation systems

    I have had some feedback from aerodynamacists that this method will create the most powerful vacuum. Also to align it with one of the header high velocity streams I am wondering if I should also concave the mouth of the pick up slightly for best effect or do I actually want the opposite and...
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