Lifting keels

[webcraft]

Can it cause back problems?

- N

 

[twisterkai]

Not on a model yacht.

 

[MrG_2]

Depends:
if you're using compressed hydraulic fluid then you should be ok.
If you're using a screw type mechanism then you're probably ok.
If you're using pulleys and strings you're probably ok.
If you're Handmandling then phone a friend...