DIY rowing machine (Openergo) - Máquina de remo casera.

Home made rowing machine/ergometer following the instructions from openergo.webs.com/
Resistance is a bit light, so I am working on improving that.The rest of the machine works well.
Update: The best way to increase the resistance is to add resistance loop bands, not to use standard bungee cords.
Search by "Resistance Loop Bands" in Amazon.
You can add them together and change the resistance as desired.
Basically it means the resistance from the wheel against the air is minimal, therefore the return mechanism for the chain is actually acting as the load when pulling.
I have tried adding PVC fins to the wheel, but the air resistance is still well below the requirements. I suppose you need a very good stiff impeller in order to go near a Concept 2 or similar machine.
For the moment using resistance rubber bands seems to be the only way to achieve a good erg experience.