Just came across this link. Anyone up to making something so tedious should get a medal. Wondering how well it works, using two fans? Ive wondered about multiple stage edfs. Can you have a smaller cross section if you have more stages? http://www.geocities.com/CapeCanaver...5/gallery.html

ive seen that 7 years ago, the plan shouldd also be floating around somewhere... ive built the mig and the fan, the fan was a real pain in the @$$ to get all the blades aligned perfectly... but none the less it spun freely from the slightest breath of air....

my idea was to use those small rubber bands like the ones in underpants.. to power the plane.. but i never got around to it... and the progect eventually got lost durring the process of moving to a new place....

i know that the plane can be made flyable, ive seen a video of it in 2002, it flew for a nice 30 seconds around a gym... i dont know if the video is still available....

The link to the plan id right there, where it says, "Build your own flying MiG 15 model with this Plan ."

huh must have missed it thanks mike!

wow that thing brings back some memories.... not all of them good LOL

id be interested to see how this plane can be made today... with a 4mm didel motor. and 10 mah batt...


i wonder if the video is still around.... it was pretty neat!


i regret never finishing mine... but it was just too much work in the end...

any word on why there are two fans in series? would like to see a video of it in action

In my teen years I built a multi blade fan for a ducted model, but I used very thin aluminum and formed the blades by pressing with my finger over a ballpoint pen or a dowel. This method allowed me to make fine adjustments by bending the blades as needed. Boy I had a lot of free time as a young Lad!!! All this stuff is buried in a box somewhere. Just for the fun of it I should take pictures of whats left of childhood imagination in bits and pieces. I still have my thermac 72 glider minus the elevator and wing covering. Not much left of my yellow piper cub. Still have my home made epoxy covered foam floats built in the late fifties and they are still in great shape. Maybe we should start a new thread of photos of stuff we built as kids!!!! Still dreaming and building. Bob Hurd

Originally Posted by lw_hughes

any word on why there are two fans in series?

i always thought it was to increase thrust... but thats just speculation.....

If you are serious about rubber-powered ducted fans, search for David Aronstein and Flying Models magazine. He published at least two designs about ten years ago and I saw David fly at least one of them. Plans from Carstens-Publications can be ordered from www.flying-models.com. I do not know how easy it will be to identify the plans and articles. I undoubtedly have at least one of the key magazine issues but I also know how hard that would be to find here.

To be successful, rubber-powered ducted fans will have to be VERY light.

Fred Rash

Any news yet on this? I cant wait to either build or see someone build one.
Jon

Any news yet on this? I cant wait to either build or see someone build one.
Jon

Originally Posted by lw_hughes

any word on why there are two fans in series? would like to see a video of it in action

i believe it is to create enough resistance so that the rubber motor has a decent amount of duration while giving proper amounts of thrust. perhaps also it offsets the small size of the impeller to produce decent thrust.

Derrik

Originally Posted by derk

i believe it is to create enough resistance so that the rubber motor has a decent amount of duration while giving proper amounts of thrust. perhaps also it offsets the small size of the impeller to produce decent thrust.

Derrik

Agreed with that, rubber motor needs to be loaded to make use of their tork
and relatively small numbers of turns available.

I was looking at the plans and have a couple questions.
1) what is the measurement used? millimeters right?
2) can anyone translate the language? is there any important detail that can be missed?
The picture of just the fan, is that the 1 used in the plane? it cant be because the length is not full and not as many ribs.
I want to make this so i can do some bench tests and maby make a different ducted fan plane.
Thanks for the help,
Jonny

it just gives you a general idea of how the fan is made thres not much info provided... so you kinda have to figure it out as you go along....i think that the fan pictured is an example...and not the actual unit installed in the flying model....

if i remember corecttly my fan cage only had 4 ribs... vs 8 as shown in the pic, and once the fan was installed into the fuse.. it spun freely without any interaction.
the fan is built into the fuse durring construction...before the sringers are glued on!!!
i made that mistake... and had to redo the whole fuse

one thing i could never figure out.. and another reason why this thing never got finished.... is that when looking at the plans it looks like there is a 2 section tunnel leading to the fan....
but no real info is provided... i built mine without the tunnel.... but thinking about it later i realized that it does in fact need it!

actually thinking about it now.. the whole balsa construction can be avoided...
and the plane can be built with durobatics instead!! nice simple and light construction!

it should be lighter than the balsa model! should be a real nice model with a plantraco 2ch rx and a nano act... the motor would be a bit tricky though...

i would build it.. but im a bit preoccupied with my micro warbirds at the moment...