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tail sizing
By sean, Section Homebrewed Electricity Posted on Wed Sep 17, 2003 at 11:19:13 AM MST
tail sizing

Im converting an induction motor and due to lack of room im going to have a short boom to mount the tail fin onto. How do i dertimine the size of the tail(surface area)? Also to help keep the prop size down im going to build a 5/6 bladed prop so having a short tail boom i dont think yawing will be a problem. I have heard that a tail can be to big and make the genny twitch in the wind too much not allowing the prop to respond and therefore loosing power.......sean

tail sizing | 7 comments (7 topical)

Re: tail sizing (none / 0) (#1)
by sean on Wed Sep 17, 2003 at 11:27:00 AM MST

for some reason my website address hasnt appeared http://homepage.ntlworld.com/s.amesbury/homepage.htm .......sean

Re: tail sizing (none / 0) (#2)
by troy on Wed Sep 17, 2003 at 01:05:47 PM MST

Hi Sean,

I'm no expert on the tail sizing issue, so I will remain silent on that, but I can comment on the prop issue.

More blades WILL give you more torque. However, it will also give you less speed (rpm). If you want more power (watts) you have to go with a bigger diameter set of blades. Not sure if that helps, but that's how the physics works out.

Best regards,

troy

Re: tail sizing (none / 0) (#3)
by sean on Wed Sep 17, 2003 at 01:24:52 PM MST

I was aware of the tsr and prop issue and im looking to keep it as small as possible and making the most of the light winds and realise that some power will be lost over a 2 or 3 bladed bigger prop but where i live thats just not possible so its a case of getting away with what i can. It will resemble the ampair 100 when finished but the performance probably less but this thing was from built scrap and has cost very little to put together but thanks for the reply Troy......sean

[ Parent ]

Re: tail sizing (none / 0) (#6)
by troy on Thu Sep 18, 2003 at 10:25:35 AM MST

3 or 4 "inefficient" machines built from what you have are way better than one "perfect" machine that you can't afford or can't build or can't put up.

Free energy is good energy.

Good luck and have fun!

troy

ps and tell the neighbors to come on over during the next power outage. They may take a whole new view of your machines then...

[ Parent ]

Re: tail sizing (none / 0) (#4)
by iFred on Wed Sep 17, 2003 at 09:10:06 PM MST

what is the total span of the prop? Then I can tell you the sqft needed for the tail.

>> all energy used to produce this comment or post came from solar and wind energy! It works!

Re: tail sizing (none / 0) (#5)
by DanB on Thu Sep 18, 2003 at 07:29:00 AM MST

you'd also need to know the lenth of the tail boom. I wonder if this machine has a furling tail or not too.

[ Parent ]

Re: tail sizing (none / 0) (#7)
by sean on Thu Sep 18, 2003 at 04:10:17 PM MST

This is a heavey machine and probably over engineered on the fixing of the genny but i didnt want it to fall apart. Ok now to answer the qeustions, the prop size i dont know because i havent got that far so its going to be a case of build something that will turn it but as i said in an earlier post i dont want a big prop so im going to opt for a multibladed prop. And to answer the second qeustion the boom is going to about a foot, again making it more condensed becuase of where i live. It could be said im very short of land so thats where i lie so far.There is no furling on the machine i havent got that adventerouse.....sean

[ Parent ]

tail sizing | 7 comments (7 topical)

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