Go Back   EcoModder Forum > EcoModding > Motorcycles / Scooters
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-23-2012, 10:56 AM   #11 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,683

The SCUD - '15 Fiat Scudo L2
Thanks: 178
Thanked 652 Times in 516 Posts
Quote:
Originally Posted by bschloop View Post
Full fairing with tail, I am going for 24" overall width, and 8' overall length. it will likely be somewhat boxy looking, as I am trying to go for as few compound curves as possible.
Search for the thread on the streamlining template, and try to get close to that shape in plan and side view..

Compound curves do help though, but so do simple curves.

Quote:
i read somewhere (can't remember where) that even a brick with rounded edges has better aero than a motorcycle
The aerodynamics of a mc + rider are awful, so it's fairly easy to improve upon them


Quote:
the biggest obstacle will probably be cooling the engine since it's an air cooled bike
There's no way around cooling @ 70mph, so it's going to cost some of the potential aero improvements

With some careful ducting, you could use the principals of a steam- or waterjet vacuum pump to extract the heat out of the cowling.

If you can get rid of most of the heat from the header, that'll be a bonus.
In addition to wrapping it you could try to duct the header's heat away, separately from the engine cooling.

__________________
Strayed to the Dark Diesel Side

  Reply With Quote
The Following User Says Thank You to euromodder For This Useful Post:
HHOTDI (03-04-2012)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-23-2012, 02:27 PM   #12 (permalink)
Master EcoModder
 
Join Date: Jan 2010
Location: Alberta Canada
Posts: 744

redyaris - '07 Toyota Yaris
Team Toyota
90 day: 45.54 mpg (US)

Gray - '07 Suzuki GS500 F
Motorcycle
90 day: 70.4 mpg (US)

streamliner1 - '83 Honda VT500 streamliner
Motorcycle
90 day: 75.63 mpg (US)

White Whale - '12 Sprinter 2500 Cargo Van
90 day: 22.01 mpg (US)
Thanks: 81
Thanked 75 Times in 67 Posts
Quote:
Originally Posted by bschloop View Post
I was hoping to find some chloroplast for all the simple curves, because it's very lightweight and rigid I will need to make a Fiberglass nose cone, but I am going with a much smaller one than Craig. I found some solar/uv curing resin that I am going to try for this. it's supposed to make the whole fiberglass thing much easier, as you have infinite working time in the shade, then you just set it in the sun and it cures. if this resin works I could make nosecones for as little as $50 each.
Does anyone know how much cooling airflow i'll need? I can get small fans meant for venting the engine compartment in a boat, but I don't know if they are big enough.
I would recomend a book The Racing Motorcycle, A technical guide for constructors, by John Bradley. Pages 225 - 228
The amount of cooling air flow needed is much less than most people emagin. the key is managing the air... with respect to velocity and amount. You want to slow the air down going past the fins of the engine so it can pick up heat and then speed the air up before re-entering the ambiant air stream.
  Reply With Quote
Old 02-23-2012, 07:03 PM   #13 (permalink)
Master EcoModder
 
Join Date: Feb 2010
Location: Michigan
Posts: 304

sr185 bullet - '81 Yamaha SR185 streamliner
Team Streamliner
90 day: 96.35 mpg (US)

Sunny Colarado - '06 Chevrolet Colarado WT
90 day: 24.18 mpg (US)

cbr250s - '12 Honda cbr250
90 day: 115.29 mpg (US)
Thanks: 27
Thanked 71 Times in 46 Posts
ok, I'm going to try the 4" blower it's rated at over 200cfm and only draws about 4 amps, and if it's not enough I can get another, and have one on each side. to offset the electrical load I can swap the headlight and taillight for LED units.

also more pics
1 side profile against "ideal teardrop shape"
2+3 sanding jig for the nosepieces
4 more finished sketchup model
5 cooling setup idea
Attached Thumbnails
Click image for larger version

Name:	ideal-teardrop-comparo.jpg
Views:	67
Size:	7.3 KB
ID:	10327   Click image for larger version

Name:	0223121141.jpg
Views:	81
Size:	31.0 KB
ID:	10328   Click image for larger version

Name:	0223121157.jpg
Views:	75
Size:	30.5 KB
ID:	10329   Click image for larger version

Name:	fairing model 2.jpg
Views:	292
Size:	67.8 KB
ID:	10330   Click image for larger version

Name:	engine cooling drawing.JPG
Views:	78
Size:	12.4 KB
ID:	10331  

  Reply With Quote
Old 02-23-2012, 07:21 PM   #14 (permalink)
Master EcoModder
 
Join Date: Jan 2010
Location: Alberta Canada
Posts: 744

redyaris - '07 Toyota Yaris
Team Toyota
90 day: 45.54 mpg (US)

Gray - '07 Suzuki GS500 F
Motorcycle
90 day: 70.4 mpg (US)

streamliner1 - '83 Honda VT500 streamliner
Motorcycle
90 day: 75.63 mpg (US)

White Whale - '12 Sprinter 2500 Cargo Van
90 day: 22.01 mpg (US)
Thanks: 81
Thanked 75 Times in 67 Posts
I suggest that the fan be on the outlet side and that the inlet side be open to airflow due to forward motion. That way you only need the fan on when standing still. I suspect that 200cfm is more than you may need for such a small 185cc engine, if the ducting is done properly.
  Reply With Quote
Old 02-23-2012, 09:11 PM   #15 (permalink)
Master EcoModder
 
Join Date: Feb 2010
Location: Michigan
Posts: 304

sr185 bullet - '81 Yamaha SR185 streamliner
Team Streamliner
90 day: 96.35 mpg (US)

Sunny Colarado - '06 Chevrolet Colarado WT
90 day: 24.18 mpg (US)

cbr250s - '12 Honda cbr250
90 day: 115.29 mpg (US)
Thanks: 27
Thanked 71 Times in 46 Posts
maybe like this?
Attached Thumbnails
Click image for larger version

Name:	engine cooling drawing.JPG
Views:	117
Size:	12.1 KB
ID:	10334  
  Reply With Quote
Old 02-23-2012, 09:27 PM   #16 (permalink)
Master EcoModder
 
Join Date: Jan 2010
Location: Alberta Canada
Posts: 744

redyaris - '07 Toyota Yaris
Team Toyota
90 day: 45.54 mpg (US)

Gray - '07 Suzuki GS500 F
Motorcycle
90 day: 70.4 mpg (US)

streamliner1 - '83 Honda VT500 streamliner
Motorcycle
90 day: 75.63 mpg (US)

White Whale - '12 Sprinter 2500 Cargo Van
90 day: 22.01 mpg (US)
Thanks: 81
Thanked 75 Times in 67 Posts
Looks good to me as a basic concept. The reason for haveing the fan behind the "radiator"/fined head and cylinder, is that it interfears with the cooling air flow to the object being cooled, thus requirering more power...
  Reply With Quote
The Following User Says Thank You to redyaris For This Useful Post:
bschloop (02-23-2012)
Old 02-24-2012, 10:45 AM   #17 (permalink)
EcoModding Lurker
 
Join Date: Jan 2012
Location: eugene
Posts: 61
Thanks: 11
Thanked 7 Times in 6 Posts
Send a message via ICQ to Electictracer
Quote:
Originally Posted by redyaris View Post
Looks good to me as a basic concept. The reason for haveing the fan behind the "radiator"/fined head and cylinder, is that it interfears with the cooling air flow to the object being cooled, thus requirering more power...
My buell xb12r uses this concept very effectively to cool the rear cylinder. It takes less then you would think. It also has a big oil cooler that does a lot of the work.
  Reply With Quote
Old 02-24-2012, 12:52 PM   #18 (permalink)
Master EcoModder
 
Join Date: Feb 2010
Location: Elmira, NY
Posts: 1,781
Thanks: 319
Thanked 355 Times in 297 Posts
Ducting looks good with a NACA scoop inlet. I like thin aluminum sheet bonded to gasket paper for insulated ducts. Check out the shape of Fred Hayes' diesel bike, it looks like a commercial unit. I use 4mm coroplast and large nylon tubing for ribs. Hex steel mesh bonded between tarp weight sheet plastic is more flexible. Consider the Morelli/ Aptera shape profile; the radius at the edges should at least 10% of the width i.e. 2.5 - 3"
  Reply With Quote
Old 02-24-2012, 01:00 PM   #19 (permalink)
Master EcoModder
 
Join Date: Feb 2010
Location: Elmira, NY
Posts: 1,781
Thanks: 319
Thanked 355 Times in 297 Posts
See airtech-streamling.com for shells and components. Blue Sky Design, Zzipper, and Mueller make canopies for recumbent HPVs.
  Reply With Quote
The Following User Says Thank You to Grant-53 For This Useful Post:
HHOTDI (03-05-2012)
Old 02-24-2012, 02:44 PM   #20 (permalink)
Master EcoModder
 
Join Date: Feb 2010
Location: Michigan
Posts: 304

sr185 bullet - '81 Yamaha SR185 streamliner
Team Streamliner
90 day: 96.35 mpg (US)

Sunny Colarado - '06 Chevrolet Colarado WT
90 day: 24.18 mpg (US)

cbr250s - '12 Honda cbr250
90 day: 115.29 mpg (US)
Thanks: 27
Thanked 71 Times in 46 Posts
I've been to airtech, and I pretty much can't afford anything they have. Fred Hayes is using an airtech landspeed fairing that costs $4000, (almost as much as a new 250cc bike, so I don't think I'm competing with him on aero. Mostly I want to show that anyone can meet the vetter conditions without shelling out the big bucks. so far my whole project is still under $700. The bike only cost me $450, and I've added a new rear sprocket (from a honda xr50) for $20, and I spent about $100 on last years homemade bags and fairing. So far this year I've ordered a fan for $20 a set of handlebars for $30, some fiberglass resin for $26 and a spare oil filter cover for $18 the rest has been random scrap that is lying around my garage. I will have to buy a few more things, but most of the investment is time, blood, sweat (lots of sweat last year), and tears/expletives.

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com