Old School Aerodynamics - here beginneth the lesson...
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Old School Aerodynamics
Moderator: DLRA
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- Posts: 475
- Joined: Mon Nov 20, 2006 12:18 pm
- Location: Melbourne
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Old School Aerodynamics
Paul
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DLRA #647
89.664 mph (aiming for 100mph+)
www.vespalabs.org
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DLRA #647
89.664 mph (aiming for 100mph+)
www.vespalabs.org
Re: Old School Aerodynamics
Hey Paul, yep interesting outcome. Ive been using a few of his theories on my bike.
Dave
Dave
Last Minute Racing
DLRA #928
2010 MPS/G 250 118 MPH
2011 Washed Out
2012 Washed Out
2013 MPS/G 250 131 MPH (RECORD)
2014 MPS/G 250 140 MPH (RECORD)
2015 MPS/F 250 DNF
2016 MPS/F 250 114 MPH (RECORD)
2017 MPS/F 250 DNF
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- Posts: 1
- Joined: Fri Apr 26, 2013 8:35 pm
Re: Old School Aerodynamics
These are very interesting tutorials. I have also used some of the techniques given here on my new bike and it worked wonders.
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- Posts: 475
- Joined: Mon Nov 20, 2006 12:18 pm
- Location: Melbourne
- Contact:
Re: Old School Aerodynamics
yes - there are new school lectures about but they assume you know the contents of an engineering degree to start with (lots of maths). It's good just to see it work. However note that scale models don't behave the same as the full size thing. I think the smaller you scale the model the higher you have to scale the speed to make it closer to reality.
I am currently trying to generate a teardrop shape automatically for my computer simulations. The idea is to start off with the perfect shape, then cut into it to suit the class (e.g. rider visible, nothing past rear tyre line, etc), then see how I can merge that and the original Vespa shape.
It will be interesting to see how the step through design impacts things i.e. big gap in the middle Vs no gap.
I am currently trying to generate a teardrop shape automatically for my computer simulations. The idea is to start off with the perfect shape, then cut into it to suit the class (e.g. rider visible, nothing past rear tyre line, etc), then see how I can merge that and the original Vespa shape.
It will be interesting to see how the step through design impacts things i.e. big gap in the middle Vs no gap.
Paul
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DLRA #647
89.664 mph (aiming for 100mph+)
www.vespalabs.org
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DLRA #647
89.664 mph (aiming for 100mph+)
www.vespalabs.org
Re: Old School Aerodynamics
To get meaningful results with a model you need to get the same Reynolds number, faster airstream or higher viscosity fluid.
Hoerner's book "Fluid Dynamic Drag" has good info about openings in streamlined bodies.
jon
Hoerner's book "Fluid Dynamic Drag" has good info about openings in streamlined bodies.
jon
DLRA#1115
Underhouse Engineering
Underhouse Engineering
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- Posts: 475
- Joined: Mon Nov 20, 2006 12:18 pm
- Location: Melbourne
- Contact:
Re: Old School Aerodynamics
Thanks - I can get that book in the Monash Uni library - but a review of it on Amazon pointed me towards...JonB wrote:To get meaningful results with a model you need to get the same Reynolds number, faster airstream or higher viscosity fluid.
Hoerner's book "Fluid Dynamic Drag" has good info about openings in streamlined bodies.
jon
Aerodynamics of Road Vehicles: From Fluid Mechanics to Vehicle Engineering ([Proceedings] / SAE)"
Hucho, Wolf-Heinrich
The latest book is not in the library though but I could get at the previous incarnation of the book (a earlier state of research) through my Uni account and it was a very interesting read. Basically it highlighted the difference between aircraft aero and land vehicle aero.
Here's the contents of the full blown book and I have ordered it because it is pretty relevant
http://www.sae.org/images/books/toc_pdfs/R177.pdf
Paul
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DLRA #647
89.664 mph (aiming for 100mph+)
www.vespalabs.org
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DLRA #647
89.664 mph (aiming for 100mph+)
www.vespalabs.org
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- Posts: 475
- Joined: Mon Nov 20, 2006 12:18 pm
- Location: Melbourne
- Contact:
Re: Old School Aerodynamics
The book arrived today - 918 pages! I have only got thought the first 20 pages but so far it is very good and well worth the money.
There is also a good section on motorbikes (about 40 pages). I know the DLRA rules allow an aerodynamic "hump" on leathers - I am wondering if other sorts of suit aerodynamics are allowed
There is also a good section on motorbikes (about 40 pages). I know the DLRA rules allow an aerodynamic "hump" on leathers - I am wondering if other sorts of suit aerodynamics are allowed
Paul
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DLRA #647
89.664 mph (aiming for 100mph+)
www.vespalabs.org
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DLRA #647
89.664 mph (aiming for 100mph+)
www.vespalabs.org
- AuotonomousRX
- Posts: 729
- Joined: Wed Jan 06, 2010 10:05 pm
- Location: Eyre Peninsula SA
Re: Old School Aerodynamics
I reckon someone has to put in a proposal to allow Head and Bum cones
Pete
Pete
Still trying to decide if I am a procrastinator
Pete
DLRA #866
Pete
DLRA #866
Re: Old School Aerodynamics
I understand there are already a few cone heads that have snuck through scrut......
Chris