Our Family Tach Race 2-2-2013

Great idea! I've been wondering how this would work out. Until I joined this forum I hadn't heard of a tach race.

duke.johnson wrote:Great idea! I've been wondering how this would work out. Until I joined this forum I hadn't heard of a tach race.

I had not either... but then when I joined the forum I only had 1.5 engines, now I have 50+

Here are our engines...

Killer Widow


Patriot vs. SheDevil


Black Widow vs. Silver Widow


The Prop (Competition 5x3)

Very cool. I hope it's a hot competition.
I hope Kim is doing well today.

Well what a disappointment. The Killer Widow on the Competition 5x3 prop would only do 18K but on the Safety 5x3 it does 20.5K

Maybe because the black one flexes and reduces the pitch. Everything will probably run slower on that stiff gray prop.

I haven't got the SheDevil started... I think my batteries are low... time to run to the store.

WingingIt74 wrote:Well what a disappointment. The Killer Widow on the Competition 5x3 prop would only do 18K but on the Safety 5x3 it does 20.5K

Yep, that's just one of the different variables that you'll run into when trying to compare RPM from one set of parameters to another.

It does sound like a lot of fun for everybody to videoing their engine running, but to try to compare RPM readings, there's just no way you can compare one to the other, unless every component is as identical as possible, even down to the same guy reading the tach. It kind of reminds me of a guy several years ago that was claiming crazy high RPM numbers for his Sure Start, only to find out he was running a .020 prop!

It's too bad you were unable to get your engines shipped out, I'd think you'd have a competitive engine or two.

Put on hold.... my wife had to go to the ER, nothing serious... I don't want to be running engines and not hear the phone ring, as she didn't want me to bring the boys up.

Back at it this morning.. Posting video results soon.

Thanks for sharing Travis.
Though you didn't get in on the CEF race, you
made the best of the situation. Cool.
Hats off to the winners,
Bob

Pretty good runs. I'll have to watch it when I can turn the sound up later on. My wife is watching the Puppy Bowl right now.

Very nice!

Phil

Interesting results, what prop is the regular tach-race done on?

Cox Competition 5x3

Good runs. I was impressed with the Black Widow, nearly 17K from what appears to be a stock engine. I bet it would easily break into the 17's if you swapped over to a no drag spring starter.

Ron

cribbs74 wrote:Good runs. I was impressed with the Black Widow, nearly 17K from what appears to be a stock engine. I bet it would easily break into the 17's if you swapped over to a no drag spring starter.

Ron

Yes the BW is stock. I think the other engines need more run-in time... besides the Killer Widow, which was a shocker to me on that prop.

WingingIt74 wrote:

cribbs74 wrote:Good runs. I was impressed with the Black Widow, nearly 17K from what appears to be a stock engine. I bet it would easily break into the 17's if you swapped over to a no drag spring starter.

Ron

Yes the BW is stock. I think the other engines need more run-in time... besides the Killer Widow, which was a shocker to me on that prop.

Yeah, those props tend to drag a bit. Still, it's the standard. I have a lot of props, maybe I should run a test sometime. I don't use the comp props much as I wreck too often and snap them. The MA 6x3 cut down to 5.5 work great except they are brittle as well. Have you messed with shims? As in cylinder/head shims?