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Old Nov 17, 2001, 05:54 PM
DeaninMilwaukee is offline
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Motors beat engines!

How to tell new gws 9x7" from old?


My title is pretty complete.
Tried some 9x7's today on my tumblewatt, definately old. Every landing a broken prop.

Shame too as they really fly that plane very nicely.
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Old Nov 17, 2001, 06:35 PM
lymon is offline
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soon all the old ones will be broken
Old Nov 17, 2001, 11:11 PM
Dave Hederich is offline
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APC 9x6 Slowflyer prop works great and doesn't break.
Old Nov 18, 2001, 03:35 PM
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Have you tried soaking them in hot water? I know some props, ie. Graupner wide blades) need to be soaked for an hour about once a month or they become very brittle and will snap easily with very little pressure.

Just a thought....
Old Nov 18, 2001, 04:07 PM
joemi is offline
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Know somewhere that has the APC 9x6's in stock?
I've emailed a couple online stores and checked my LHS, no 9x6(local store had alot of every other size APC props though)

I must have the new 9x7, cuz I just came in from doing a nose dive from an altitude that I could barely see the TM, then did a quick snap to try and pull some fast loops. Well, SNAP was right... wings folded. BUT, it sorta landed ok, but what was amazing was the prop made it. My "normal" soft grass landings usually snap 'em right off.
Old Nov 18, 2001, 05:00 PM
Red Baron 47 is offline
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marauder,

You've got something there. People have been boiling Nylon props for years. I boiled the blades on my Terry props since they're not geared and spin fast. I hung them from fishing line and a cross piece so they wouldn't touch the bottom of the vessel which I figured would be hotter than 100 deg C.

I tried it on an orange GWS prop. Luckily I tested only one because it softened and warped. If you found out the temperature that was just below softening it might work. Kind of an annealing. Might not have the full effect though since it's Nylon that benefits most. It needs water incorporated in it's structure. I don't know what the GWS props are made of, but it doesn't seem like Nylon.

Funny, I've never broken a prop on my Moth though I've smashed the cowl twice due to glitches. That was with a 10" prop, but i still don't know how I did it without breaking the prop. I've flown a 9" since then and it was ok, but I fly off Macadam. I guess it's the grass that gets ya.

RB
Old Nov 18, 2001, 05:47 PM
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Sorry inform you can not easy to see the different, only near the root section was made thicker. We did make any mark to identify.

Sorry to cause your inconvenience. I thought safety is very important, but......
Old Aug 31, 2007, 04:51 PM
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Quote:
Originally Posted by DeaninMilwaukee
My title is pretty complete.
Tried some 9x7's today on my tumblewatt, definately old. Every landing a broken prop.

Shame too as they really fly that plane very nicely.
Have you tried the GWS 9 x 7.5 HD propeller. Their shape makes the hub stronger so they are a lot harder to break.

Photo No 1 is an unused propeller and photo No 2 is a propeller currently in service.

Ken
Last edited by kensp; Aug 31, 2007 at 05:13 PM.
Old Aug 31, 2007, 04:59 PM
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Hey Ken, what prompted you to reply to a thread that's nearly six years old? Just curious ...
Old Aug 31, 2007, 05:17 PM
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Deleted because it was a Double Post

Ken
Last edited by kensp; Aug 31, 2007 at 05:26 PM.
Old Aug 31, 2007, 05:22 PM
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I did not look at the thread date but just looked at the list of similar threads that is posted at the bottom of threads. The thread I had been reading was "New GWS Announcement/Tracking thread" and the post I was reading in that thread was dated today. I had assumed that the threads on this list of similar threads were current threads. In future I will look at the date of threads on this list.

Ken
Old Aug 31, 2007, 07:01 PM
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's OK - I was just a bit amused - though Dean does still haunt these environs some and may well want to try the 9x7.5 HD in place of the 9x7 RS.

I've noted down in the forum comments forum (is that redundant?) that many of the "similar threads" displayed in that new feature are quite old. No idea what criteria are used to define "similar" but clearly being recent isn't one of them.


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