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Author Topic: looking for suggestions for improved aerodynamics on a naked motorcycle  (Read 10956 times)

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Buamotorsport

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #30 on: August 05, 2018, 01:19:42 AM »
1920 miles? Is that all......it’s around 6000 if not more for me. Fly London to LA ....then pick the car up and tow to Bonneville. Lol. It’s worth every cent.

Offline maj

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #31 on: August 05, 2018, 02:34:48 AM »
And 8268.5 miles for me , made the trip for 10 yrs this season will be 11

Offline Koncretekid

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #32 on: August 05, 2018, 07:10:44 AM »
Kevin,
Although there's no substitute for going to the Salt Flats during an event for new ideas, you can learn a lot just from the photos that are posted by Scooter Grubb (https://www.scootershoots.com/BUBMotorcycleSpeedTrials/2014-Bonneville-Motorcycle-Spe/) and Phil Hawkins (http://ishootfromthehip.com/contact.html) as well as the photo gallery on this site.
Tom
P.S. For example, Scooter's BMST photos, 2014, page 17, photo 337
« Last Edit: August 05, 2018, 07:22:42 AM by Koncretekid »
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Offline speedrattle

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #33 on: August 05, 2018, 05:35:29 PM »
And 8268.5 miles for me , made the trip for 10 yrs this season will be 11
1920 miles? Is that all......it’s around 6000 if not more for me. Fly London to LA ....then pick the car up and tow to Bonneville. Lol. It’s worth every cent.

it's worth it, but that's simply more money than i have, worth it or not. i've got two kids in college and three more headed in. but if i strike the lottery i'll be there.
« Last Edit: August 05, 2018, 05:38:05 PM by speedrattle »

Offline Larry Forstall

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #34 on: August 05, 2018, 09:12:01 PM »
The rules state that streamlining is anything IN FRONT of the Rider that acts to guide the air around the bike. How about a nice belly pan that goes from the front of the engine to the rear where a batwing guides the air around the tire ?  NASCAR teams had lots of neat ideas such as oval exhausts and very wide flat bottom oil pans. Rules now do not allow anything. Much more fun in the old days .   LSL

Offline Frank06

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Re: riding position.  I would experiment a bit, try keeping your head centered (just make sure you can see where you're going!) then raising your back, etc.  Hopefully there will be no shortage of runs available to experiment.  Did you try a different helmet (one without the lip)?

centering my head means i have to rest my chin on the top tube, way above the triple tree in the wind. ducking down means my head creates a wind shadow that conceals some of the rest of my body. i've run older-style bell helmets that just bounced from side to side at speed. this one with the lip actually has no discernable buffetting, so i'm guessing they got it right. smooth as glass at speed, rather thnanknocking my head back and forth. the shoei helmets have a kamm profile, and i'm look at the budget for one of those. my bell is getting chewed up from grinding against the fork tubes.

Quote
I've been told that ceramic bearings make a difference at 200 mph, I imagine the impact would be more significant at lower speeds.  I don't know if anybody has ever made back-to-back runs in an effort to try to quantify.  Wheel bearings are an obvious choice but I've also heard of guys changing transmission bearings.

i'm looking at wheel bearings for the winter rebuild, along with all the other small increment stuff. dunno about transmission bearings. the layshaft runs in wet needles, so i'd only get to change out the mainshaft ball and roller. maybe it would be something.

did you run something up there last month? i was busy and didn't have much time to talk to people.
I guess my suggestion was that actually trying the alternative position would prove your assumption that your current position was better.  You know what they say about assumptions...  I ran the electric 'Busa.

Sent from my MotoE2(4G-LTE) using Tapatalk


Offline speedrattle

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I guess my suggestion was that actually trying the alternative position would prove your assumption that your current position was better.  You know what they say about assumptions...  I ran the electric 'Busa.

yo!

i talked with you on the line about the voltage you were running on your bike. wonderful machine.

on positions, i don't know what is better, or what is worse. have to look at the timing slips. i will test it.

currently broke-back-butt-in-the-air seems effective, just not aesthetic.
« Last Edit: August 06, 2018, 05:14:30 PM by speedrattle »

Offline speedrattle

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #37 on: August 06, 2018, 05:13:06 PM »
The rules state that streamlining is anything IN FRONT of the Rider that acts to guide the air around the bike. How about a nice belly pan that goes from the front of the engine to the rear where a batwing guides the air around the tire ?  NASCAR teams had lots of neat ideas such as oval exhausts and very wide flat bottom oil pans. Rules now do not allow anything. Much more fun in the old days .   LSL

this next meet is where i see what i can do without bodywork.

for next time, i'll show up with a kamm boxx, a fender, a bellypan to test. . .

dunno.

Offline speedrattle

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #38 on: September 06, 2018, 05:02:31 PM »
the totally naked machine did well.

133.002 in the standing start mile, and 135.259 in the standing start mile-and-a-half.

no aero aids on it all, except my fat butt stuck up in the air.

looking for three-spoke 17-inch cast wheels now.

Offline speedrattle

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #39 on: December 15, 2018, 09:39:37 AM »
old GSX750 wheels. got two of them:



the front will go in with just spacers.

17 x 3.00 inches. goodyear says their 2.5-inch frontrunners will fit just fine.

Offline donpearsall

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #40 on: December 15, 2018, 12:06:11 PM »
That's a good find! Those spokes look like good aero. And being able to use an actual LSR tire is a plus.

Don
550 hp 2003 Suzuki Hayabusa Land Speed Racer

Offline speedrattle

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #41 on: December 15, 2018, 06:43:19 PM »
well, now i have a question.  i was planning on fitting these front and rear, but i just had a friend tell me that goodyear front runners aren't legal in SCTA for a drive tire.

is that correct?

alternatives in this size are hooziers and mickey thompsons, who i haven't spoken with. it has never occurred to me to ask about drive wheel applications for one of these. i'm not going to be putting more than 65 hp through it, and not more than 140mph, ever.

goodyear said that their 17x2.5-inch front runners aren't speed-rated (he said, we didn't bother . . . ), but the 17x4-inch tires are labelled for 300 mph.

Offline RidgeRunner

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #42 on: December 15, 2018, 07:48:07 PM »
     Been my observation that the "Front Runner" term is loosely used when applied to the Goodyear tires.  My understanding that the same molds are used for Drag Fronts and LSR tires.  Internal construction is different between the two.   The actual tire model number is what counts when they are considered for specific applications, speeds, driven or not, etc.

                 Ed

Offline maj

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #43 on: December 15, 2018, 09:06:18 PM »
old GSX750 wheels. got two of them:



the front will go in with just spacers.

17 x 3.00 inches. goodyear says their 2.5-inch frontrunners will fit just fine.

I wish they would say that to the SCTA  :-( 

Offline speedrattle

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Re: looking for suggestions for improved aerodynamics on a naked motorcycle
« Reply #44 on: December 15, 2018, 10:38:47 PM »
well, looks like andy cox has them on his 68 norton atlas. 17 -inch wheels, with tubes, and he ran 154 on them.



clearly i need to make some telephone calls.