Micro Rigger from www.microhydros.com

[simcom]

Hello,

First of all sorry for my English, it's a little bit rusty.

I'm new to riggers, I was trying to learn everything about this kind of boat before building => unfortunatelly something is wrong...

This is rigger from www.microhydros.com (Walter Geens plans), speed 400 6V (graupner), K29 (Graupner), 6cells GP110AFHR. I tried to contact anybody from microhydros who built somethig similar to this boat => no help....so I thougt you could help me...

This is the movie: 12mb

http://www.opal.tomkii.net/simcom/Micro%20...ger_video_1.avi

Big noise, no speed. The back of the boat is deep in the water because of additional bag with screws...I put it there to balance with weight...I didnt have any idea what to do... Dont worry, there was everything the same without those screws, only the back of the boat was higher...

At present I'm going to install the strut one more time, with bigger angle.

This was my angle before destroying the hull:

http://www.opal.tomkii.net/simcom/Micro%20...shaft_angle.jpg

Now I want to do something similar to rigger from www.rbckits.com:

http://www.rbckits.com/44ea97e0.jpg (bigger angle)

Is this a good idea or something else should I do?

Maybe You have some pictures which are explaining the right way to install the strut or balance the boat...

Thanks in advance for any answers!!!

Regards

simcom

 

[TomMoorehouse]

ok, well.... you have a bunch of problems. first, more angle on the propshaft wont help. nowdays very few people use a solid shaft. most use some sort of flex shaft or wire drive. this allows for more adjustment. but usually the shaft is flat to 2 degrees nothing like what you have. I believe walter has way too much angle of attack in his plans. It should be closer to 2-3 degrees where he has 6.

here is what i suggest to try to get the current hull to work. first get as much weight forward as you can. your cg should not be very far behing the trailing edge of the front sponsons. second use some rear sponsons as well. attach them with double sided servo tape so they can be adjusted.

if you want to build a new boat there is a 6 cell rigger plan that could be scaled down to a micro hydro I suppose. use a flex shaft with it for sure!

from the video..... i was unable to tell for sure, but it is possible the prop was just cavitating. try a different prop. also try a nice even throw to put the boat in while it is running like the nitro guys do.

 

[simcom]

Hello,

At last there is the answer!!! Thank You...

By "changing the angle of the shaft" I mean actually only gluing it a little bit deeper with the same angle... now the shaft is taken off.... so I must glue it to the boat somehow...and Im looking for solution..=>how. Yes, this is stiff shaft (I used it to make the boat low budget), and I know that flex could be better... on the other hand I dont know how to build this flex at home to save some $$$. Piano wire.... but what more??? Do You have any tutorial on this???

Now I have repositioned all the stuff in the hull, new motor mount (smaller, lighter), new servo mount (now it is saving some space to manouver with electronics).

I thought about changing the prop to K26 for example but there is M2 thread (I have M4)... Maybe I can modify my K29? but how???

Assuming, I still need some advice with the shaft...(at this moment this must be stil the same stiff shaft for sure)...

Regards

simcom