MTO Calidus

[scottessex]

Why would they galvanize instead of CAD plate?

[Master Roda]

Originally Posted by scottessex

Why would they galvanize instead of CAD plate?

Cheaper? I don't know.

[rfsolutions]

Originally Posted by Jason O

I think people are swapping the terms High Grade with High Quality and Low Grade with Low Quality in their minds.

A grade 8 bolt is a high grade bolt (because the number 8 is higher than 5) but it does not mean that it is manufactured to a higher quality, it just means it is manufactured out of different alloys and may be heat treated differently and the result is it has different properties. When they design things, engineers choose the bolt for its properties (grade) and the suitability for a certain use. In some applications you do not want a very strong (high yield) bolt because the properties that make it very strong also make it brittle.

I dont know the CAA's concerns, but please just do not swap the word grade for quality in your mind.

Jason

Seriously??

Are you saying an NAS bolt is not high quality compared to a grade 5 bolt?

You build your rotor head and blades with oversized grade 5 bolts. I'll use properly specified NAS bolts thank you! Do you even realize what the difference is? Grade of bolt equates to quality! NAS bolts are x-rayed!

[karlbamforth]

Originally Posted by rfsolutions

Seriously??

Are you saying an NAS bolt is not high quality compared to a grade 5 bolt?

You build your rotor head and blades with oversized grade 5 bolts. I'll use properly specified NAS bolts thank you! Do you even realize what the difference is? Grade of bolt equates to quality! NAS bolts are x-rayed!

I think you missed his point there Marv.

[PTKay]

Originally Posted by scottessex

Why would they galvanize instead of CAD plate?

Because it's cheaper?

This is a 100.000$ machine, but to save few cents is always nice.

[ckurz7000]

PTKay, sometimes your bias really gets to me. If you read the SB by the CAA (and its basis in the BCAR Section T) and the response from the manufacturer (as cited on the German forum) together with some limited knowledge of the German certification regulations for UL gyroplanes, you'd be in a much better position to make snide remars (or not).

-- Chris.

[PTKay]

Chriss,

this is a general remark, like the remarks made by others on using non aviation hardware.
Also Xenon is a 100.000$ machine, and it also doesn't use the
AN standard bolts and nuts.

Sometimes they are saving on a wrong place.

It is our life at at sake here. No bias.

[aerobatic]

I don't beleive that a company as big as Auto-gyro will use low grade component to save on such critical component as the Jesus bolt. This doesn't make any sense.

In the gyro business, you're reputation is literally a death or life matter for your business (and for your customers). You don't save a few bucks on such ground.

I won't change the bolt on my fresh new Calidus.

Maher

[rfsolutions]

Not only are some manufactures using low grade/low quality hardware on their designs, they're using the wrong hardware! Some of the machines I've looked at had absolutely no mechanical locks for parts with rotation! Nylock nuts are not an acceptable locking fastener for parts with rotation. Drilled bolts with castellated nuts and locking pins cost more than nylocks but when the bolt falls out of your control rod or falls off your throttle you'll wish the manufactuer spent the extra money!

We're not talking about tractors here, we're talking about aircraft! The ultralight crowd learned firsthand about low quality bolts years ago by killing a few folks.

Civil authorities (FAA & CAA) base their advice on experience. When they warn manufactures about a practice or process it would be prudent to pay attention. If you want to read a good free document about working on aircraft get a copy of Advisory Circular 43.13-1B & 2B.

[500e]

Only posted the link for interest did not realizes the controversy it would start.
I am interested in the manufacturers reply though, to a MANDATORY PERMIT DIRECTIVE.
It would not be a good thing to have accident in the UK without complying, would think insurance Co would be could it produce insurance problems in other countries?