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Make your own Hobbs they are easy to make. I have a calculation sheet that figures it out for you here http://www.modelenginemaker.com/index.php/topic,6012.0.htmlDon
Sounds like Aeronca and Anzani - You can't buy a cutter for the 10 tooth gear
Quote from: Don1966 on December 20, 2017, 08:09:12 PMMake your own Hobbs they are easy to make. I have a calculation sheet that figures it out for you here http://www.modelenginemaker.com/index.php/topic,6012.0.htmlYes I have to agree Don I will never go back I like the hob approach simple to make and simple to use.
Make your own Hobbs they are easy to make. I have a calculation sheet that figures it out for you here http://www.modelenginemaker.com/index.php/topic,6012.0.html
Yes Jo, those are the engines I need gears for. I'm quite keen to make my own rather than buy some, does the fact that you recognise the gears mean you have made thoise engines ?I do also need to know the pressure angle Mr C. relied on ?
Quote from: Boo on December 22, 2017, 12:45:40 PMI do also need to know the pressure angle Mr C. relied on ?They are box standard normal 20 degree PA gears. For their purpose in the engine as long as they are all of the same PA it will not really matter you just need them to go round and round and maintain the right ratio
I do also need to know the pressure angle Mr C. relied on ?
If Jo was buying from HPC I would assume that 20pa is OK as that is the standard angle they do.
What are the reasons for prefering one of these common pas vs the other ?