F3F-1 project
#1
Thread Starter
Join Date: Dec 2002
Location: stoughton, WI,
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
F3F-1 project
This past weekend, I got my new scanner in, and was able to import the F3F-1 3-view into turbocad. Short learning curve to do what I have done so far, which is trace outlines of the fuse, formers, and wing planforms.
Plan is to make the upper wing 60", to make it IMAA legal for no reason at all.
My first decision is power, if I should go glo or electric.
The cowl is only 4.5" from firewall to front edge of cowl, which precludes the Saito 1.80 I was hoping to use. I can't recess the firewall, cause the landing gear is practically right behind the firewall. Even if I go with fixed gear, it's going to be tight back there.
The other option is to go with electric. I have yet to make any calculations for wing area, or guesstimate the weight, so I'm just guessing at .90 size equivelants, and not actually figuring out wattage and voltage I'd probably need.
Prop size about 16" scale, but I can go to 18" but only 1/2" ground clearance in level position.
If I want to go with glo, I can build one way, but if I go electric, I build a different way.
So in your opinion, do you think this size of electric motor, about 22.2-3x.x volts (various motor ranges), with a 16" prop would be enough oomph for a bird this size?
I've also thought about building a 1/8" scale (48" upper wing span) with fixed gear as a "proof of concept" plane, but I'm more leaning towards full size with fixed gear first, then retracts after I figured out how to build them.
Plan is to make the upper wing 60", to make it IMAA legal for no reason at all.
My first decision is power, if I should go glo or electric.
The cowl is only 4.5" from firewall to front edge of cowl, which precludes the Saito 1.80 I was hoping to use. I can't recess the firewall, cause the landing gear is practically right behind the firewall. Even if I go with fixed gear, it's going to be tight back there.
The other option is to go with electric. I have yet to make any calculations for wing area, or guesstimate the weight, so I'm just guessing at .90 size equivelants, and not actually figuring out wattage and voltage I'd probably need.
Prop size about 16" scale, but I can go to 18" but only 1/2" ground clearance in level position.
If I want to go with glo, I can build one way, but if I go electric, I build a different way.
So in your opinion, do you think this size of electric motor, about 22.2-3x.x volts (various motor ranges), with a 16" prop would be enough oomph for a bird this size?
I've also thought about building a 1/8" scale (48" upper wing span) with fixed gear as a "proof of concept" plane, but I'm more leaning towards full size with fixed gear first, then retracts after I figured out how to build them.
#2
RE: F3F-1 project
There was a thread in the scale forum a while back on either the F3F or the F4F, can't remember which. They had built a set of retracts for the plane that worked that you might want to take a look at if you decide to build your own. Just a little FYI
#3
Thread Starter
Join Date: Dec 2002
Location: stoughton, WI,
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
RE: F3F-1 project
Thanks for the tip. I was able to find out about that small electric F3F with retracts.
I wonder if a modern servo would enough strength to keep a similarly designed gear in overlock position? I was thinking of electric retracts involving a servo, electric motor, and 4 switches.
I wonder if a modern servo would enough strength to keep a similarly designed gear in overlock position? I was thinking of electric retracts involving a servo, electric motor, and 4 switches.
#6
Thread Starter
Join Date: Dec 2002
Location: stoughton, WI,
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
RE: F3F-1 project
I don't want to go bigger, cause it becomes a PITA for storage and such.
Re: solenoid. I'm all for simplfying, but I have no idea how it work in this application. I think of solenoids as simply switches that use low voltage to turn on big voltage. I'd have to have a circuit diagram or pic to understand this.
Re: solenoid. I'm all for simplfying, but I have no idea how it work in this application. I think of solenoids as simply switches that use low voltage to turn on big voltage. I'd have to have a circuit diagram or pic to understand this.