I am a model builder I am currently working on a B 29 Superfortress 148 scale. I would like to install four separate motors so not to heat up the plastic and melted to make the propellers turn I’m trying to make it as realistic as possible if it’s possible can someone suggest what I need to make this happen thank you and have a great day.
By the way, I need the motor to run cool And to run independently and with variable speed.
Al
@ajgonzalez1962 Welcome to the RobotShop Community. To confirm, you’re looking to make a model, but not have it fly?
If you plan to run it from the mains, you can opt for AC motors which tend to have very good run times without heating up. If you plan to run it from a battery, you can choose a BLDC which can provide more than enough torque for spinning the props so that it won’t heat up.
More details about the application would help.
Good morning Sir
I am building a reveal model 148 scale be 29 Superfortress for static display only. I’m going a little ambitious on this, besides electric motor suspended propellers I want to add mini smoke generators so I could start each engine independently in at start up a puff of smoke would come out just like on the real aircraft. Also from Evan Design‘s, I got a new craft lighting kit and putting in all the navigation and landing lines on it. This be 29 is going to be wired up pretty good. I’m not sure on the smoke generator if that’s the final option that I want to add if I can. Whatever information he require please let me know and I’ll get that out to you as soon as possible I hope I’ve given you enough.
Respectfully,
Al
So teh engines won’t be used to produce real thrust, and they need to operate for long periods of time. No mention how this will be powered though, which is the difference between AC and DC motors. For long running with minimal heat, AC or BLDC are best. A motor only heats up when there’s current passing through the coils, which is only the case when there’s resistance. This means either the motor needs to be overpowered forthe application, or there is very little resistance (i.e. not actually generating thrust). If you angle the propellers in such a way that they slice through the air without generating thrust, the current will be kept low.
We don’t have anything for smoke, to that’s on you.
This project just need to have the propellers spin for a short amount of time this will not run probably no longer than a minute. And he should be battery poweredOne concern that I do have is the length of the shaft to move the propellers you have to go through two pieces of plastic which is the radial engine of the aircraft. When I get home I’ll measure the links and get back to you on that
Al
It would probably work with a set of micro-quadcopter dc-motors. They are made to work with a single LiPo ( 3.7V) but they will spin at 1.5V too (AA battery)
Another option is to look for cellphone vibration-alarm motors. They would probably shake the model a bit, which is an additional ‘scale’ effect.
