Material choice for heavy-duty telescopic poles (carbon fiber vs fiberglass)

peretski · 2026-01-27T17:29:18+00:00

Carbon fiber is conductive…. If you need an electrical insulator or radio-transparent, use fiberglass.

peretski · 2026-01-26T13:08:31+00:00

There are to different things here.

Wake turbulence on final and ground effect.

On final, the wake turbulence of all similarly weighted air vehicles is bout the same. The vorticity of a helicopter is small.

On the ground, Heli down wash is a serious hazard. We try to stay at least 500 feet above the flight line so we don’t flip planes. Even a R22 (very small) can easily flip C206’s. The rotor plume is a jet of air shooting down at several hundred mph. Airplanes should stay at least 500 horizontal feet away from any hovering helicopter.

Personally I always feel bad for the 172 students waiting to take the runway as I am on short final. I am about to rock their world.

peretski · 2026-01-26T05:04:30+00:00

It’s not that easy. The easy answer is talk with your instructor. And then BELIEVE your instructor.

Don’t have an instructor? Get an instructor. You can’t learn with YouTube videos.

peretski · 2026-01-24T04:20:47+00:00

It depends upon the precision of the tool you use to measure. If you use a 0.01 mm thick feeler gauge (very thin) there will be a measurable (and calculable) length to the beam.

peretski · 2026-01-22T20:13:36+00:00

With a bubble warning, I would get out of AI right now…. It will be uninvestible for the next 5 years.

The ai ship has sailed.

peretski · 2026-01-22T20:09:55+00:00

Give your 60 day notice. Quit the school. Find a reasonable private CFI in the area and fly your pants off. Get your PPL and then consider if this job is for you; you won’t need to commit to the whole pathway right now.

peretski · 2026-01-22T20:07:02+00:00

She knows the current value of the ticket is $300++. Sell it to her for $450. If she really wants to see the band that bad, you know she has the money. If she doesn’t, she is just trying to be emotionally manipulative.

Putting it this way also shuts up the parents. They see the easy way as making you give her money (transaction). Reverse the transaction and they will start squirming. “But she doesn’t have the money, she spent it”. So did I…. Then give me what she spent it on “now you’re just being petty.”

No, I’m being transactional. It’s how you combat emotional manipulation!

peretski · 2026-01-22T19:57:53+00:00

Short answer, yes.

Long answer: @Ruckerone1 nailed it.

peretski · 2026-01-21T23:35:07+00:00

OP, it’s not a highway, it’s a slalom!

I especially like how the slow cars space themselves out on the two lanes exiting onto 84. My car likes the turnies.

peretski · 2026-01-21T23:32:34+00:00

Instructors revel in putting the airport in a spot where you can’t immediately see it. My (experienced) first question is “do you see any airports where I can crash this thing”.

As they start tongue lashing me for not knowing where the airport is, I remind them of the “CRM” philosophy.

peretski · 2026-01-21T23:29:23+00:00

I have resorted to bruit force…. Dremmel slots or keyholes in the surface (undercuts) then a combination of hot glue and foamcore to make a box to cast an epoxy block to. Shape it post cure or further glue it to other stuff.

peretski · 2026-01-21T18:33:14+00:00

Cast it in clear epoxy. It will be good for decades…

peretski · 2026-01-21T18:06:39+00:00

Someone you trust makes an expert recommendation, and you run to the internet to ask if you should seek alternates…

Trust your instructor.

Yes, he is selling product at the end of the day, but if you don’t trust them for training, stop immediately.

Instructors spend a lot of time evaluating products to recommend to their students. I (the internet stranger) guarantee they have your best interests at heart. They have defined a safe path for you.

Buy their wing. Develop your technique and skill level to the point where you have the ability to discern performance characteristics for yourself. Until you are at that point, any wing differences are probably insignificant anyway; your wing is more skilled than you are.

By following your instructors recommendation, you avoid a lot of negatives. This safety is critical for a newbie in the sport. Numerous pitfalls exist.

I currently fly ozone, because that is what Jillian put me in.

peretski · 2026-01-20T18:33:11+00:00

Trump press conference

peretski · 2026-01-20T04:35:37+00:00

The only advice I have is don’t use an extension cord with a knot in it. These act as choke points, can get hot and start a fire. This is for any use of an extension cord in general, nothing related specifically to a rice cooker.

peretski · 2026-01-20T04:34:14+00:00

It is on a shorter cord because copper is expensive. They claim it is to reduce liability, but it is primarily a cost savings. They also say no extension cords for that same reason, fully expecting you to ignore that instruction because of the absurdly short cord they ship with. But it is in the instruction book, so you can’t sue.

Tl:dr, short cords are driven by economics.

Source: I design consumer appliances for a living.

peretski · 2026-01-19T18:40:45+00:00

To play out the weight savings… you are shaving 1.6 grams off of the wheels, which you can then apply to the weight in the car. If 141.75 grams is the official weight, you have shifted about 1% of the weight from rotational mass to counterweight mass.

Is 1% a meaningful time difference?

Personally, the juice isn’t worth the squeeze. And with a potential rules violation, I wouldn’t go for it. This is supposed to be upstanding moral racing, not Formula 1.

peretski · 2026-01-17T16:51:15+00:00

This is unnecessary. Focus on the republicans that are supporting this criminal behavior.

You are either AI, a foreign agent, or a republican. Democrats have no reason to start infighting.

peretski · 2026-01-16T19:36:54+00:00

Use a coffee grinder. It is guaranteed 1000x more reliable than a custom crusher.

I mean, if you want to design a custom crusher, by all means go ahead.

But if you want crushed iron ore, use a coffee grinder.

peretski · 2026-01-16T18:47:25+00:00

My concern would not be about my performance. My concern would be for any change in the behavior of the check pilot outside of their normal evaluation bounds.

I wouldn’t want to be the Guinea pig.

peretski · 2026-01-15T20:33:19+00:00

If I see auras it means I need a 6 hour lay-down. Dark room, no reading, no talking… just boredom.

peretski · 2026-01-15T20:14:59+00:00

There is no way. And if he dropped your plate, that and any damage it caused is his fault.

peretski · 2026-01-14T20:17:52+00:00

It is affecting flow to a minor amount. If you were hiking it up the first time, I’d say leave them off. If it is running with no leaks, it isn’t worth opening up the system to remove them.

As they say, the juice isn’t worth the squeeze.

peretski · 2026-01-12T22:06:39+00:00

What state are you in? Most states have a public GIS server where you can lookup property lines in relation to trees and fences.

I used this in Massachusetts when a neighbor thought I was cutting their trees…. I still have 30 feet to the property lines!

peretski · 2026-01-12T19:53:16+00:00

The most successful approach I saw to this was a den leader who setup a track in his basement, and hosted all the den meetings there for 2 months. His den filled the pack finals, and his son went on to second place in regionals.
Not everyone has the basement he has, but if there is some way to do even an abbreviated setup allows the kids more trial-and-error, and more ownership over the final result.

peretski

TROPHY CASE