Lynn S

....for the TD bottom end you sent me/ BW top end.
My GloBee tach came in yesterday and I have been playing with it some. It seems the numbers will vary a lot at times. Then sometimes the reading is very steady. I must be moving or something.

all engines are using the same Master Airscrew 6 x 3 prop. and Byron's 1/2 A fuel, 25% nitro. I know the tach numbers will be higher with a 5 inch prop.

Black Widow 12,600
the TD/BW 13,200
AP .061 14,000 +

Babe Bee (almost new) 13,000 + ????

The Babe Bee may have a TD head on it. I will have to swap heads with the BW to check for any difference next time. The Babe Bee with the slit exhaust ports really runs strong.

This was a static test and none of the planes or engines were moved. This is my first time to try to get some readings and they may improve next time.

Tim Wiltse-RCU

Lynn,

Those numbers are VERY LOW. Your TD/Black Widow should be turning 16/18,000 without breaking a sweet! I am not a big fan of MAster I'm Screwed props. Try a different prop if you have any.

Later,
Tim

Lynn S

Tim, I have used the 5 x 3 cox prop and noticed the engine screams but the plane is not as fast. I can do some testing now since I have a tach.

Larry Driskill

Lynn, try making sure you have good light on the prop. Sometimes when I try to tach engines in low light I have to go fetch a flashlight to get good readings.

>>Fixed HTML code. wr.

Lynn S

Larry, I checked outside in daylight. Does it matter if you are in front or behind the prop?

Larry Driskill

I have a TNC tach and before that I had a Heath Kit tach. Both of those will work on either side of the prop.

Lynn S

Larry,
It seems to do better from the front. I guess it can see more of the prop.
The instructions say check from the back, thats why I asked.
Thanks, Lynn

Larry Driskill

Lynn, does the tach have a switch to allow for taching both 3 blade and 2 blade props?

Lynn S

yes, I have it on the two blade prop.

I think the readings will get better when I am able to lift the planes up and get a better needle setting and let the engine clear out. I had the planes tied to the top of a push cart and the TD/BW was on a test stand.
I can say the TD/BW ran for a heck of a long time on one ounce of fuel.

What is the most popular size prop? I know it takes a 5 inch prop to get high rpms, but I thought most use a 6x3.

ajcoholic

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Hey just saw this. I was away for 3 days at a fun fly out of town..

AJC