If it’s really 20 cm wide it’s too small 🙁 If we were looking at a commercial blade-bashing operation we’d need to be able to accommodate up to 16 inches / 40 cm

We can’t get Coopers Stout this end of the planet.. I’ll try to import some, as I expect it helps one come up with ideas like blade-twist-reversal.

The thing about the DH graph is it’s been re-interpreted by the RAE authors who were only interested in blade shape, not absolute dimensions – so they need to be added. The trick to testing whether its the same blade profile is to make an assumption of commonality and then work backwards to test it.

We know that the Spit blade is 64.5 inches hub centre to tip, so that helps – that’s your horizontal axis mark-upable right there. Take the chord at a station from the HS tabularlar figures (I used 42 inches as it’s the traditional ‘reference station’) then assume that the chord at that station on the DH blade graph has the same value. That gives you a vertical scale.. Mark up this scale of assumed absolute values on the vertical axis (I didn’t show that on the one I sent you), and then plot the rest. If it’s a different blade profile it will very quickly show up!

Re Typhoon hubs, these threads are useful: http://forum.keypublishing.com/showthread.php?133906-What-Does-This-Prop-Spider-Fit (Merlin Pete’s list) and http://forum.keypublishing.com/showthread.php?137760-Propellor-hub (The all-knowing Anneorac).

So what you really need, in a perfect world, is a DH 55/ (or 5500) hub – which is presumably equivalent to a HS 33E60.

There are crash relics out there, but airworthy might be another matter!