need speed 400 prop
- Thread starter MikeP
- Start date
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forresterace
Well-Known Member
- Joined
- Aug 14, 2002
- Messages
- 247
Hi Mike
I would suggest that you start out somewhere around an Octura X427 prop. An even better idea would be to pick up several plastic X431 props and try cutting them down to around 28-29mm diameter. This should put you in the ballpark
I would suggest that you start out somewhere around an Octura X427 prop. An even better idea would be to pick up several plastic X431 props and try cutting them down to around 28-29mm diameter. This should put you in the ballpark
Trent Hare
Member
- Joined
- Mar 10, 2003
- Messages
- 16
Hi gents, wow - some of you look familiar 
Tom (Octura) called the other day - he is working on 2 new 1/8" bore props that will help us out...
If I remember correctly an M425, and a 1727.
Tom (Octura) called the other day - he is working on 2 new 1/8" bore props that will help us out...
If I remember correctly an M425, and a 1727.
T
TomMoorehouse
Guest
i dont know where where we'd be if it werent for tom!
how old is he now?
three cheers for OCTURA!
how old is he now?
three cheers for OCTURA!
MikeP
Well-Known Member
- Joined
- Mar 13, 2002
- Messages
- 1,460
I was wondering if you guys could look over my micro and tell me if you see any probles with it. I started it quite a while ago after stumbling onto the website microhydros.com.
Do you think it will get on top of the water?
www.ad.kengarff.com/mikep/micro/micro1.jpg
www.ad.kengarff.com/mikep/micro/micro2.jpg
Speed 400, 6 cell 270ah nicad, airtronics ES-20 speed controller. 32mm prop.
It's 12" long. The cg is at 6" right at the front sponson trailing edge.
-MikeP
Do you think it will get on top of the water?
www.ad.kengarff.com/mikep/micro/micro1.jpg
www.ad.kengarff.com/mikep/micro/micro2.jpg
Speed 400, 6 cell 270ah nicad, airtronics ES-20 speed controller. 32mm prop.
It's 12" long. The cg is at 6" right at the front sponson trailing edge.
-MikeP
forresterace
Well-Known Member
- Joined
- Aug 14, 2002
- Messages
- 247
Mike
Your hydro is pretty small and the fact that your steps are 50% back concerns me a little. Your CG must be behind the sponson step edge - approximately 1" for stability. I'm guessing that your 400 motor is a 7.2v wind. In order to get any reasonable runtime your current/propload is going to have to be pretty low. I'm sure that the 32mm prop is going to be WAY too much for that. I think that your choice of the cell size is consistant with the motor choice and the size of the hull. Your going to have to keep it really light to work well. I certainly wouldn't attempt to run it with more than a X427 to begin with.
Your hydro is pretty small and the fact that your steps are 50% back concerns me a little. Your CG must be behind the sponson step edge - approximately 1" for stability. I'm guessing that your 400 motor is a 7.2v wind. In order to get any reasonable runtime your current/propload is going to have to be pretty low. I'm sure that the 32mm prop is going to be WAY too much for that. I think that your choice of the cell size is consistant with the motor choice and the size of the hull. Your going to have to keep it really light to work well. I certainly wouldn't attempt to run it with more than a X427 to begin with.
