Propeller Pitch Gage - Build and usage

[@aeromodeller1]

I clamp the protractor to the stand with a clothes pin. I glue a paper protractor copy to the gauge so I can read one degree divisions, estimate to a tenth of a degree.

[@sirvilhelmofyonderland]

I’m not a indoor plane maker, but your videos are interesting,,, and that’s pretty cool 💯👍

[@joshuawfinn]

Glad you enjoyed it!

[@rossclements8874]

I'm glad you decided to make one. I spent something like 2 days making one patterned from the A2Z gauge, but I don't think it is very accurate. I suppose if you use the same gauge it does not matter if it is off, because all of the adjustments will be equally off.

[@joshuawfinn]

Ross Clements, Hope has been asking me to do this for about two years now. I decided it was time. :)

[@sanjaysoni2933]

Hi josh can you give me pitch Gage ratio chart.. Please

[@aeromodeller1]

@@sanjaysoni2933 There is a very simple formula which you can do on a pocket calculator that has the tangent function. You will not be constrained to the 5 degree steps or three radii on the table. Pitch equals pi times the tangent of the angle times the Diameter. The Diameter is twice the Radius.

[@aeromodeller1]

Interesting concept. I like the sliding prop support that allows measurement at a continuous run of radii. I like the 180 degree protractor. I'm a little concerned that the prop post, protractor support and protractor hub are a bit wobbly. It depends on the precision you require. What are the precision and reliability of this gauge? The protractor has 5 degree divisions. This might be good for rough settings for test flights, comparing one setting with another, and for getting both blades to match. For detailed performance evaluation, greater precision is required. I have built and tested several prop gauges. My final design combined the best features of several designs. It was built specifically for measuring 8" carved balsa props. The shaft clamp might need to be modified for other types of props. My report is here: www.endlesslift.com/propeller-gauges/ Couple improvements I can see. That protractor is pretty small, but you can lightly engrave finer angle markings. You might require a finer indicator, maybe a pin. Face the protractor out so it can be read from the end, rather than having to look in at an angle past the prop blade - parallax error. Rubber band around thin wire can bend the wire, causing the blade to tilt. Pressure right next to the support will be less likely to bend the prop shaft. You might find that a wire clip is more reliable.

[@Colin399]

How much to ship to Scotland?

[@joshuawfinn]

colin miller, our international rate is $20, flat rate.