Required Horsepowr at 60 mph - Page 2 - Fuelly Forums
Thread Tools Display Modes
Old 05-06-2007, 02:06 PM   #11
Registered Member
Join Date: Oct 2006
Posts: 303
Country: United States
Originally Posted by omgwtfbyobbq View Post
Well, the problem with a small engine is BSFC usually isn't much better than what you're getting anyway.

Anyway, you probably already know this stuff, but I might as well be thorough. The best bet for you depends on what you can do and what your routes are like.
Well, not all of it. I have experience as a mechanic and schooling in engineering but I really had not looked up any specifics on bsfc with respect to small engines and part throttle bsfc. I appreciate your input and you apparently have spent a lot more time thinking about this problem than me.

With respect to regen the only practical reasonably priced small system I found was the brushless etek with the millipack. However it is limited to 48 volts.

If you want higher voltage and regen the options are relatively expensive AC or parallel field DC motors with a little lower efficiency.

I had about talked myself into 72 volts to pull a little less amperage from the batteries and therby extend the range. The motor of choice would be a permanent magnet motor so the fields would not be powered. Nothing wrong with a series motor but the PEMG 132 seemed a bit more efficient, way lighter and sort of priced right to me. No regen though.

If I were to decide to do this today it would be one of these to motors. There may be other options.


usedgeo is offline   Reply With Quote
Old 05-06-2007, 03:26 PM   #12
Registered Member
Join Date: Mar 2007
Posts: 1,138
Country: United States
Originally Posted by omgwtfbyobbq View Post
Like the opposite of this? I dunno... 4 T105s plus motor/etc would weigh in at ~300-350lbs, so maybe a 500lb trailer.
I'm...speechless... I love this country.

Bill in Houston is offline   Reply With Quote
Old 05-07-2007, 10:23 AM   #13
Semi-retired OPEC Buster
BeeUU's Avatar
Join Date: Jan 2007
Posts: 200
Country: United States
Originally Posted by lca13 View Post
So let's take this idea one step further in a different direction. I noticed an older Formula 1 car that had a fan installed in the rear to suck air out from underneath to increase down force. Take this idea.... the fan provides some thrust... but maybe also it can be installed to balance the overall air pressure around the car (like air supplied from the grill) or even from the perimeter of the body where the flow changes from streaming to turbulent, but before it becomes separated, thus somehow extending the streamlined/turbulant flow longer getting more "soon to be bad" air back into the low pressure zone behind the car. When I say "bad" I mean air flow that is about to separate and cause all sorts of drag. Again, only at cruising speed and maybe only during glide. On paper you could get two beneifts... electrical energy converted into a few pounds of thrust, plus better aero.
See SAE paper 2001-01-2072. It discusses the effects of blowing air at the trailing edge of large trucks to reduce drag. Sorta what you are referring too.

BeeUU is offline   Reply With Quote
Old 05-07-2007, 06:42 PM   #14
Registered Member
Join Date: Mar 2007
Posts: 191
Country: United States
OK back and just found the paper.... also found in the RC world small high thrust fans.... like up to 20 lbs of thrust at 24 volts... wondering what an additional "on demand" 10, 20, 30 ilbs of thrust would do to increasing some of the engine off glides.... fun thinking about it anyway, that is for sure.

lca13 is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
New Feature: Loan and lease cost labrie Fuelly Web Support and Community News 1 02-08-2012 01:12 AM
Fuelly Android App - eehokie Fuelly Web Support and Community News 2 07-14-2010 08:59 PM
drivetrain resistance bagpipe goatee General Fuel Topics 9 09-14-2008 09:04 PM
MID Install SVOboy Experiments, Modifications and DIY 33 06-04-2007 10:27 AM
Solar Concept Scorn Electric and Solar powered 9 01-13-2007 05:14 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 06:02 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.