Landracing Forum
East Coast Timing Association => ECTA General Chat => Topic started by: racer x on May 16, 2010, 03:59:49 PM
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I have made a rear section in an attempt at cutting drag. Maybe it is a waist of time but it only took a day to make .I need the practice.
As always I want to stay in Modified partial streamliner .
The rule says the wheel must be visible for 180 deg.
Photo 1 is what I have now. Photo two is what I think I need to cut.
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Sorry Jon.I meant to post this in the ECTA rules section.
Is this rear fairing legal for Modified Partial streamlining?
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I dont know if ECTA has adopted tne new,2010 SCTA mps rules but it would not be legal with SCTA. No part of the rear rim can be covered. Also cant be past the rear edge of the rear tire, I couldnt tell if yours is past the rear edge.
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ECTA rule is a vertical lint through the axle . Nothing behind that line 180 deg of wheel visible and no more than three inches behind the tire
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Eric, I believe that it cannot drop below the top edge of the wheel too
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It dose droop a tad.
I need to trim this little bit at the back.
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Eric,
what is the material that you are using to extend your rear section, plastic or rubber? Are you going to use fiberglass to smooth out the transition between the existing tail section and the new piece. It will be interesting to see the results.
In '02 we made up a new tail for my Busa after running to the NAPA store to get some plastic mudflaps, tail length in the modified class was being enforced and I was too cheap to hack up the tail like everyone else. Lots of duct tape, passed inspection with it and made it to impound.
Cheers,
Scott
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I tossed this together out of fiberglass yesterday. I did not want to invest much time. It is intended to smooth out the airflow at the rear.If it works I will clean it up and paint it. Otherwise it goes on the Offering to the god of speed shelf.
I got the idea from a guy that made a smaller rear fairing and claimed a couple MPG improvement. That tells me it cut drag. SO I will try this.
It is held on with six screws. Mounting from the passenger peg mounts( Sorry nitrous bottle mounts ) and a bracket at the rear. I can remove it in seconds and test its effectiveness.
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remember, the rule is when you are sitting on the bike. So take shock play into account with body weight.
No need to trim it at the very back as long as you can see the rim.
Bill
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Thanks Bill . :-D And many congratulations . I was going to paint my new fairing "primer gray" I figure that is the new black at Maxton :cheers:
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Now Eric,
There ain't no substitute for "Hot Rod Black" it ain't primer, it ain't "flat black" it ain't "semi gloss". It ain't "egg shell" it's "SATIN BLACK"... ain't no gray or grey in it.. LOL.. :cheers: :cheers:
Tail looks good, trim it up a bit, sand it and paint it YELLOW and pin stripe some Red on there for me...
Have fun this weekend, go fast, set a record or two and be safe.
See you in June
Charles
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Thanks Charles. I think i will make another one and spend more than a day on the Buck. It all starts at the core .And this is a good thing to measure from .But it is not straight enough to paint. Just a test.
I am sorry you will not be at Maxton this weekend. I hope you enjoy your trip. Try not to think bout cars and relax .It will all be there when you get back Have fun.
:cheers:
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Eric,
What was the result of your rear fender streamling? Any gains that you can attribute your fender work?
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There sure were gains -- he got me to comment on it, that's what.
Other than that, though, you'll have to wait for him to tell you the story.
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I think it helped. Even running out of gas half track the bike went 108mph. :oops: . And my best pre race speed was 110. I made 5 passes over that speed with personal best of 112mph.
Since my engine was not running right I have to conclude the fairing was a key factor for those speeds
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Congrats on your personal best.. :cheers:
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Thank you very much.
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Nice meeting you Eric (I was the younger guy with all the tattoos.) You're bike has made me realize selling that ex250 was a mistake. I guess I'll be on the hunt for another one soon! :cheers:
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By the way hes good with a weed eater :wink:
thanks for the help.
terry
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Racer x, cleaning up the rear gave me similar results on a modified partial streamliner - a significant increase in speed.
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Thanks.
Now I think I should cover all the holes in the fairings, Looking at land speed bodywork . There are very few radiator cooling holes or the like .
I hate to add weight .But it is only a couple ounces of aluminum if that. I will work in a salad at lunch to compensate for the added weight.
It looks fast . Feels fast . But what will the trap say?
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Eric, great job on your best speeds. Now you can paint the new parts to match the new paint job.
Keep up the good work.
See ya in June.
Charles
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Welcome back Charles. we missed you last week.
I am holding off on paint. I still need to do some testing. Then when I figure out if it is better or worse I will make the whole fairing out of one piece of light weight fiberglass when I am done.I still need more hand coverage .
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Eric, keep us posted,,,
It sure looks good. It should even look and preform better in a lighter one piece configuration.
Charles
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Thanks.
Now I think I should cover all the holes in the fairings, Looking at land speed bodywork . There are very few radiator cooling holes or the like .
I hate to add weight .But it is only a couple ounces of aluminum if that. I will work in salad at lunch to compensate for the added weight.
It looks fast . Feels fast . But what will the trap say?
That looks great! How did you affix the aluminum panels?
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Charles, I thought you would say the new part was the right color. Eric, I didnt think you could get much lighter. Shorter might help, but that's a pretty extreme modification.
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That looks great! How did you affix the aluminum panels?
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First I molded the panels by hand to lay perfectly flat on the fairings. Then I used clear packing tape to hold them down tight . Once everything was assembled and looked OK . I used 1/8 inch counter sunk pop rivets.
:-D So they don't blow off form the unbelievable speed.
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Eric,
I enjoy following your progress, the bike looks great.
Do you plan on extending the front fender as well?
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Thank you very much for the kind words. Progressing has been fun.
I have a zx 12 fender coming from Catalyst composites. I have tried to make a front fender .Four failed attempts.
First my problem was making it strong . Then it was too strong and weighed a ton. Then it was trying to get it to look the same on both sides.
that was it . After making something that looked like a wrecked train . I gave up and bought something good.
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Which fender Eric? The one I was looking at would definately put you in the Altered class without a lot of cutting. We may be looking at different ones.
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2000 zx12 Front fender It should show 180 deg of rim . No more than an inch in front of the tire and nothing below the axle line.
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Hey -- that fender looks quite a bit like the one on the front of my 2000 ZX12R. Man-o-man, what a coincidence, hey?