Single motor for 1/72 U-boat.

[redboat219]

HWSNBN,
what size brushed motor would you recommend for use with Revell Type VII if one decides to go with a single motor driving both props through a counter rotating gearbox?

[He Who Shall Not Be Named]

HWSNBN,
what size brushed motor would you recommend for use with Revell Type VII if one decides to go with a single motor driving both props through a counter rotating gearbox?

380, direct drive. Split.

[redboat219]

380, direct drive. Split.

Got it.

Another question, I've seen a Type VII being driven with a single motor driving only one shaft, would the boat suffer from assymetrical thrust?

[Monahan Steam Models]

Got it.

Another question, I've seen a Type VII being driven with a single motor driving only one shaft, would the boat suffer from assymetrical thrust?

Yes it would

[redboat219]

From what I've read online and in books ( Das Boot) running on one engine was done to conserve fuel and to do maintenance.

So I guess they trimmed the rudder(s) to compesate for the assymetrical thrust?

[Monahan Steam Models]

The center line between shafts on a type VII are spaced fairly close together and hypothetically should also be parallel to each other. This reduces the asymmetrical thrust but does not completely eliminate it. So yes a slight rudder adjustment to counter act the thrust would be necessary proportional to the forward speed.

Personally if the original boat had twin screws then I would make both operational regardless of how many motors it needed. I would not make them individually controlled in a model with such a narrow shaft spacing and parallelism.

[redboat219]

if the original boat had twin screws then make both operational regardless of how many motors it needed.

I hear you. And less trimming needed.