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Possible to modify a 30V Ametek for higher volt/RPM ratio? | 20 comments (20 topical, editorial)

Re: Possible to modify a 30V Ametek for higher vol (3.00 / 0) (#6)
by johnlm on Wed Jul 25th, 2007 at 07:28:22 PM MST
(User Info)

When you talk about cutting your blades down from 3 ft to 2 ft, (implying that the blades now rotate faster) are you cutting off the ends only or are you also recarving the face angle? If you are just cutting off the ends please explain to me how this increases the rotational speed.

Thanks

johnlm

[ Parent ]

Re: Possible to modify a 30V Ametek for higher vol (3.00 / 0) (#7)
by johnlm on Wed Jul 25th, 2007 at 07:51:39 PM MST
(User Info)

I assume you are using a prop that is not the same pitch angle from tip to root.

[ Parent ]

Re: Possible to modify a 30V Ametek for higher vol (3.00 / 0) (#8)
by harriskevine (harriskevine@ou.edu) on Wed Jul 25th, 2007 at 11:08:26 PM MST
(User Info) http://www.thekevdog.com

I'm using a set of PVC blades. The outer 10" or so of the blades were at about the same angle. I'm not sure why, but I noticed immediate increases in shaft speed after cutting that 10" off. Am I doing something wrong?

[ Parent ]

Re: Possible to modify a 30V Ametek for higher vol (3.00 / 0) (#14)
by Ungrounded Lightning Rod on Thu Jul 26th, 2007 at 07:11:32 PM MST
(User Info)

If twist is too low the outer portion of the blades ends up pushing the air rather than being pushed by it, stealing power from the inner part rather than contributing power.

Sounds like you had the twist wrong. Redoing the blades at full length with the right twist on the outer portion should give you a bunch more power. (The outer portion of the blades is the most important because it has the most swept area per unit length.)

[ Parent ]

Possible to modify a 30V Ametek for higher volt/RPM ratio? | 20 comments (20 topical, 0 editorial)

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