Rocket stove flue length and bench layout...

Hi,

Planning my first rocket stove. My layout may require up to 40 feet of 8" bench pipe and it will then exit vertical up an 8" chimney about 35 feet. Are these pushing the max lengths of run? I'm using a 55 gal drum on a 8" system like in Onato's book.

Also, my bench layout requires several 90 and 45 degree bends. Again, is there a limit here?

I will have at least 4 - 22.5 to 45 degree and at least 3 90's in the bench. I know it is advised to not have more than 2 90 in a normal wood burner.

Lastly, has anyone ever tied their rocket pipe into an existing wood burner stove pipe? If so how did you make the connection?

I have an existing wood burner and was thinking if I could just do a 45 degree Y into the existing pipe, I could still use both if necessary.

This would then require some type of tightly sealed dampers or "valves" to close any flow from one or the other.

Anyone do such a thing with success?

Lastly, I will bench test this out doors, however I will not be putting up 35' of vertical pipe. How will my stove characteristics change with the long vertical chimney pipe?

Thanks much,

M