Grattan National Race, Near Grand Rapids, MI--This weekend!!!! Options

[groot]

I'm trying to secure a spot in the Runoffs this weekend. A decent finish at Grattan will allow me to attend this year.

If anyone's interested in spectating or helping out, I'm in the 5th run group. 2 qualifying sessions on Saturday and the race is on Sunday. Our race on Sunday should be just after lunch.

Directions and information about the track:
Grattan Raceway Website

It's early in the morning and I'm about to head out for a rainy practice day....

[URY914]

If you're going to do the "sewer" pipe do it right. I've seen air ducts on race cars that look like a 5 year old did it.

1. Use HVAC sheetmetal for the pipe. You can get it a Home Depot but they may not have 7". Try a HVAC/plumbing supply house. It is smooth on the inside and will allow the air to move through it with very little friction.

2. Use as little flex duct as possible. The flex duct isn't smooth on the inside. You can get 45 and 90 degree bends in sheetmetal duct.

3. Use the real HVAC sheetmetal tape not the cloth racer tape or "duct" tape. The real duct tape is silver and has a "AHSE" printed on it. It is much stonger than cloth tape.

4. The sheetmetal duct is made with a crimped end to fit in the next section of pipe and be taped. I would cut the crimped section off and butt the pieces together and tape them. Makes a smoother transistion.

I see a lot of HVAC duct work in my projects (hospital construction). I'm doing a surgery addition to a hospital now that has 7 OR's. You should see the ductwork in the ceilings. It's a shame we have to cover it all up.

Paul