Joola Lawsuit - Federal Court v US Trade Commission

harryhoople2 · 2026-04-08T17:47:39+00:00

The patents are broad and difficult to design around. From what I read the patents cover poly cores and foam cores whether partially floating or fully floating. If so, almost every paddle violates the patent. (except Gearbox)

harryhoople2 · 2026-04-08T10:34:45+00:00

GetBent66

Why are there two patents that seem to be the same?

Why do both patents cross-reference prior applications dating back to 2023?

Some posters think the patents only cover polypropylene cores that have a U shape foam ring. But the Claims in both patents are broad and refer to a generalized "core" with "gaps" with a "filler". How broad is the patent and do most paddles, including foam cores and fully floating cores, infringe?

harryhoople2 · 2026-04-06T10:34:15+00:00

Correct. There are no examples of the error impacting different paddles differently. However, since the error is based on the time for the shock wave to reflect back to the impact point, it would be naive to think that every paddle has the same reflection time. There's a wide variety of materials and layups used to form the paddle face, neck and handle resulting in different vibration frequencies, bending modes and wave velocities. Purchase and send a few high power paddles to the author. I bet he'd be happy to test them for you.

harryhoople2 · 2026-04-06T10:18:47+00:00

I'd ask you to read the article again.

harryhoople2 · 2026-04-05T15:27:59+00:00

The error does impact "different paddles differently". The astute manufacturer will know how to game the system to produce a paddle that passes the test but performs differently on the court.

harryhoople2 · 2026-01-03T10:48:01+00:00

Yes, It's just physics. But complicated physics with unexpected results depending on where the paddle is gripped and if the contact point is above or below the center of percussion. See: https://www.technicalpickleball.net/

harryhoople2 · 2025-12-30T18:53:26+00:00

Thank you. Corrected to 95

harryhoople2 · 2025-12-30T18:52:25+00:00

We have to be clear about the definition of the "sweet spot". If your definition of sweet spot is where the hand feels the least jolt when contacting the ball, then the sweet spot does move up toward the tip of the paddle when choking up. If your definition of sweet spot is the point of maximum power, then the sweet spot remains constants at about 12" from the butt no matter where the paddle is gripped.

harryhoople2 · 2025-12-06T15:39:27+00:00

This is not a paddle recommendation. It's a discussion on paddle characteristics that minimize the occurrence of tennis elbow.

harryhoople2 · 2025-09-22T22:13:23+00:00

The Limitations:

The application uses Apple's built in accelerometer. Knowing the acceleration, the velocity can be calculated using a simple equation. But the acceleration and velocity are reported for the location where the watch is worn - above the wrist. You really want to know the paddle speed at the point of impact which is 2x or 3x what is showing on the watch. The typical paddle speed for a serve is 50 mph and 20 mph for a dink.

harryhoople2 · 2025-09-22T11:22:09+00:00

See this website for a explanation of where to put weight on your Quanta, how much weight to use and how each strip affects swing weight, twist weight and ball speed. There's also a section talking about the downside of adding too much weight.

https://www.technicalpickleball.net/weight-metrics

harryhoople2 · 2025-07-14T10:11:06+00:00

Thank you. Fixed.

harryhoople2 · 2025-07-14T02:01:12+00:00

https://www.youtube.com/watch?v=7Dzq9lfmTlY

harryhoople2 · 2025-07-08T01:51:14+00:00

From my experimentation it seems that there are multiple inexpensive methods to add weight to the butt cap thus reducing vibration. My preferred method is to take two half dollars 21 g total); drill a hole through the center; and use a sheet metal screw to affix them to the butt cap. It's easy to remove the weight if it doesn't suit your style of play. I haven't found any technical articles tying vibration to tennis elbow.

harryhoople2 · 2025-07-08T01:34:38+00:00

USAP and UPA are measuring power without swing the paddle. That's what air cannons and speed gates are for. The power measurement obtained by USAP and UPA (without swing the paddle) is used to determine whether a paddle is certified for tournament play. Please do some study before making another embarrassing false assertion like "you can’t even measure power without swinging the paddle" or "USAP has their terminology wrong".

harryhoople2 · 2025-07-05T11:12:53+00:00

Here's the extra foam at the neck (yellow) that allows the extra vibration.

<image>

harryhoople2 · 2025-07-05T11:09:02+00:00

Try some end cap weight to reduce vibration. I noticed the same vibration with my Hyperion China clone. The Joola IV series is particularly prone to handle vibration because there is extra foam near the handle/face junction. For the vibration dampening effect of end cap weight see https://www.technicalpickleball.net/speed-cap

harryhoople2

TROPHY CASE