rx7 SE

iTrader: (5)

Does anybody have any experience (or know someone who does) with building our wankel motors on a CAD system? I'm building a similar version but to run on air and I wanted to bounce some ideas/difficulties off of you guys on here before I speak to anyone else.

Thanks for any help,

~Ant

CrackHeadMel

iTrader: (2)

are you going to use the mazda style sealing matrix or something else / not at all

what are you doing to do for lubercation if any

rotarygod

iTrader: (1)

Do you just want something drawn in CAD? All I do all day at work is create things in 2D and 3D CAD.

B6T

iTrader: (2)

I've got a 13B rotor housing modelled in Inventor that is perfect in terms of internal geometry.

I used the the formulae found in the "Rotary Engine" book by that Japanese guy, then I used excel to produce X-Y coordinates for the epitrochoid working surface, then I used an AutoCAD script to import these points into a spline, then I imported that spline into Inventor and built the rest of the housing from there.

You can use the same process, you just have to change the parameters (eccentricity, rotor radius) to suit your needs.

rx7 SE

iTrader: (5)

I had thought about using a sealing system but considering the duration of this motor will only be to see how well it runs I'm just going to experiment with proper clearances between machined metal surfaces inside the housing. It won't go into production or do anything important at all, it's just what I have chose for a class project just to test my skills and to understand our motors (and it's capabilities) better.

For lubrication I will most like prelubricate it before assembly and if it sucks it up too fast i've made some arrangements to handle that situation.

If you have anything that I could use as a guide I would be more than happy.
my email is sportscarft2@hotmail.com or you can use djohn187@uncc.edu

Are you familiar with ProEngineer Wildfire?


What book are you referring to? I may have get it.

B6T

iTrader: (2)

^ The book I'm referring to is readily available on the internet. I want to say its by Kenichi Yamaguchi, but I don't know if that's actually his name.

rx7 SE

iTrader: (5)

I've been trying to download it through onlinefreeEbooks.net but it's not working. What website did you download it from?

rx7 SE

iTrader: (5)

got it! let the reading begin!!

catch-22

iTrader: (2)

hey i go to uncc also! good to see another rotor head here, and sense you mentioned wildfire i take it you are in engineering or some kind.

rx7 SE

iTrader: (5)

yup, mechanical. What's ur discipline?

catch-22

iTrader: (2)

same lol. if you are looking for the Kenichi Yamamoto books about they rotary engine i have both of them just shoot me a PM.

rx7 SE

iTrader: (5)

I wonder if I've seen you before? I was just talking to someone in the computer lab in duke about a rotary design last week, was that you?

catch-22

iTrader: (2)

nope was not I, do you live on campus or off?

rx7 SE

iTrader: (5)

Which equation did you use for the rotor housing? I've found two different one's one is

X=e*cos(3*theta)+R*cos(theta)
Y=e*sin(3*theta)+R*sin(theta)

Then this one is from Rotary Book which gave me some very strange values:

X=e*cos(alpha)+R*cos(theta)
Y=e*sin(alpha)+R*sin(theta)
where theta=(1-p/q)*alpha

Any of this sound familiar?

snapcaseacilec

iTrader: (3)

how bout trying to create an actual example of the wankel out of house hold items


anybody make one that can be used for demo instead of on a CPU???

rx7 SE

iTrader: (5)

I ended up making the 3d model for my class and getting extra credit since no one has ever done it before, lol.. Rotary FTW!!!

snapcaseacilec

iTrader: (3)

how did you go about doing that???

snapcaseacilec

iTrader: (3)

anyone????

rx7 SE

iTrader: (5)

i'll try to write a little somethin somethin bout wut I did this weekend when I have some free time

snapcaseacilec

iTrader: (3)

Thank you,

I'm trying to do a mock up and I'm having a hard time doing it.

RotaryEvolution

iTrader: (30)

these are the only other guys to have built rotary engines on a large scale including internally air cooled and diesel versions. who knows, maybe they will even send you some schematics.

http://www.freedom-motors.com/

levelzero

iTrader: (1)

I have a very basic solid works model floating around. PM your email address and I'll send it to you.

rx7 SE

iTrader: (5)

sorry it's been taking me so long to respond. Been getting home really late at night's and have been way too tired but now it's the weekend and I'm good, lol. So how about this, I could try and explain it to you on here, and possibly confuse the heck out of you or I could send you a .pdf file of the book "a rotary engine" written by Kenichi Yamamoto himself. That's what I studied like it was a Bible to build mine. It's 156 pages so I hope it will fit, just let me know what you wanna do.