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February 27, 2021, 07:26:18 PM

Author Topic: Bottlehead race sponsorship  (Read 3303 times)

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Online Tom-s

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Re: Bottlehead race sponsorship
« Reply #45 on: September 19, 2018, 08:08:35 AM »
Could you share a link on here Doc? :)

This sounds good through Crack / HD 800's!

Offline Doc B.

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Re: Bottlehead race sponsorship
« Reply #46 on: September 19, 2018, 08:13:55 AM »
It sounds way better with the baffles out  ;) We have quite a bit of video from the event, that Jim Laurel will be crafting into a mini documentary. I will post links when I get them.
Dan "Doc B." Schmalle
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Offline Doc B.

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« Last Edit: September 19, 2018, 12:35:46 PM by Doc B. »
Dan "Doc B." Schmalle
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Offline Doc B.

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Dan "Doc B." Schmalle
President For Life
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Offline Doc B.

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Re: Bottlehead race sponsorship
« Reply #49 on: September 19, 2018, 04:13:25 PM »
So I walk into Central Market to see if I got in the newspaper...
Dan "Doc B." Schmalle
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Offline kgoss

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Re: Bottlehead race sponsorship
« Reply #50 on: September 20, 2018, 05:18:28 AM »
Congratulations Doc!  Quite an achievement and it’s great you are being recognized for it.

On a side note it’s awesome to see something as old as me (born in 1962) going that fast. 🏍👍
Ken Goss

Offline Doc B.

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Re: Bottlehead race sponsorship
« Reply #51 on: October 31, 2018, 02:05:56 PM »
I have put up video of my rookie land speed run on YouTube

Dan "Doc B." Schmalle
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Online Tom-s

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Re: Bottlehead race sponsorship
« Reply #52 on: October 31, 2018, 10:51:12 PM »
Headphone users! Mind the volume level!

Looks great Doc!

Offline debk

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Re: Bottlehead race sponsorship
« Reply #53 on: February 09, 2021, 01:55:57 AM »
I know this topic is old.

What is anything are you allowed to do to reduce drag of the bike/rider combination?  Fa

Deb
Debra K

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Offline Doc B.

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Re: Bottlehead race sponsorship
« Reply #54 on: February 09, 2021, 06:12:02 AM »
I'm running in what is called a naked class. That means no front fairing, which is generally considered to be worth about 5-15 mph. So the aero treatment body-wise is limited to what you can do to the front fender and what you can do to the seat. Other than that it's all about reducing frontal area, rider position (a.k.a. tuck) and maybe lengthening the wheelbase up to the allowed 10% to improve the Cd a little. There are a zillion other little details, like tight leathers, proper gearing, etc. to obsess over. And horsepower (a.k.a. where the bulk of the money goes). I'm deep into beefing up my motor for this August, so I can give it a much bigger shot of nitrous than last time without breaking things. At least that is the theory. In 2019 I put a valve adjuster screw through a valve cover on my third run.

Here's a video of my second run from 2019, with nitrous injection, a better clutch and a bit more practiced technique. Once I'm on the bottle I'm running about 10 mph faster than in the previous video. Hoping to add another 5 mph this year.

« Last Edit: February 09, 2021, 06:25:15 AM by Doc B. »
Dan "Doc B." Schmalle
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Offline Paul Birkeland

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Re: Bottlehead race sponsorship
« Reply #55 on: February 09, 2021, 07:06:35 AM »
This?
Paul "PB" Birkeland

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Offline Doc B.

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Re: Bottlehead race sponsorship
« Reply #56 on: February 09, 2021, 07:38:29 AM »
I'll take two bottles, please. Losing weight has only a tiny effect on top speed. But it sure would make my leathers more comfortable.
Dan "Doc B." Schmalle
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Offline debk

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Re: Bottlehead race sponsorship
« Reply #57 on: February 09, 2021, 12:41:20 PM »
i wonder if small vortex generators would have any effect of improving laminar flow around the rider.  It would probably take wind tunnel testing/modeling for placement.  don't know if this would be allowed.

Interesting sport
Debra K

Pearl 2 Phono amp
BeePre with BeeQuiet, Psvane black bottle 300b
F4 AMP
Sota Sapphire, Pete Riggle Woody Tonearm, Kiseki Purpleheart Cartridge
Bob's Devices SUT
Bottlehead DAC
Home built full range driver speakers

Offline Doc B.

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Re: Bottlehead race sponsorship
« Reply #58 on: February 09, 2021, 02:41:28 PM »
I have considered it. Like putting VGs along the edges of my arms and legs and at the hunch in my back. The math for the speeds I run works out to the vortex generators being about 1/32" tall or something equally silly. There was a time a few years ago that one of the pro cycling teams had little bumps on the arms of their jersey sleeves. The calcs for that kind of stuff at cycling speeds are like you gain .3 seconds over 30 miles.

One thing I plan to try down the road is lengthening the rear swing arm 5", which would allow me to create a relatively long tail on the back of my seat the width of my butt and tapering back to and end even with the rear of the rear wheel. That is one of the few aero things allowed in my class and it should help improve Cd. The old saw in land speed circles is "Don't worry about the hole you open in the air. Worry about how well you close it."

My plan for the past couple years has been to use photogrammetry to model the bike and me in my leathers. I imagine you know about the online CFD analyzers like simscale. My hope is to get a decent 3D model and run a CFD analysis of different riding positions, components, etc.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.