BeechTalk - BT

Username Protected · **Posted:** 13 May 2015, 23:59

Username Protected wrote:

Your bike would be fine, even if you put it into space. The difference in pressure is only 14.7 PSI. Space shuttle tires are fine, and the wells are unpressurized. The plastic tubes with shaving gel, or skin cream don't fare so well, though.

Unfortunately, I did some field testing of this in my P-baron where I only ascended to FL180. Forgot to empty the tires one trip. Both inner tubes quickly burst when I tried to ride on them. No problemo, I had spare inner tubes. Well, those didn't last long either since the tires had split. Didn't look too cool jogging along side my bike until I could get back to the rental condo and tires replaced. Of course, it was a holiday weekend in a resort area. Bike store was closed until Tuesday after the long weekend.
I prefer biking to jogging.

'Course, I was taken it easy, not lettin the sound of the wheels drive me crazy but the girl my lord in the flat bed Ford never came along to take a look at me

(These are the 110psi skinny tires for a road bike). Temp may have affected them too.

Username Protected · **Posted:** 14 May 2015, 09:00

So "external baggage" on a jet means your stuff is -41C and unpressurized? Sorry for sounding daft but yeah, that seems like an extreme environment for just about anything you'd be carrying along. Especially as cheaply as things are made nowadays.

I go through bike innnertubes much more today than yesteryear. They're just cheaply made.

Username Protected · **Posted:** 14 May 2015, 10:59

unique photo according to the one who took it

http://i.imgur.com/Cxozc6J

you're welcome

Username Protected · **Posted:** 14 May 2015, 11:18

Username Protected wrote:

unique photo according to the one who took it

http://i.imgur.com/Cxozc6J

you're welcome

I think it's an amazing looking plane. Looks like G5.

Username Protected · **Posted:** 14 May 2015, 11:29

Username Protected wrote:

Dave,

I flew with some deflated tubes in the baggage compartment of the Aerostar. They came apart when we inflated them.
So that points to temp being the problem, not pressure.
I also know that rubber gets brittle and has issues at extreme temps (I saw one of the cool shows on Discovery dealing with trucks in Siberia a long while ago). No idea what that temp is...

Tim

I don't know the science behind this, but I took my bike many places in the P baron; it fit wonderfully in the nose compartment. If I deflated tires for the trip, never had an issue when I later pumped them back up and rode. Of course, not nearly as high as in the Citation. The one trip to Destin, where I didn't deflate them (actually got distracted while loading and forgot) is where they later came apart on me. Never tried it again. Just deflated them and it wasn't an issue.

Username Protected · **Posted:** 14 May 2015, 11:32

Username Protected wrote:

unique photo according to the one who took it

http://i.imgur.com/Cxozc6J

you're welcome

I think it's an amazing looking plane. Looks like G5.

Username Protected · **Posted:** 14 May 2015, 12:16

That SJ30 is pimp. Where can I buy?

Username Protected · **Posted:** 14 May 2015, 16:02

Username Protected wrote:

Look how good a T-tail can look when Ed Swearingen designs it.

Yeah, but that gear. Ugh.

The cost to maintain the PC24 tail will be less than the SJ30 because the fin has a larger space for actuators. The SJ30 crammed all those in a thin fin. That gave them the better "look", but it will be a cost driver in maintenance. Think about all the stuff that goes into the horizontal stab: control, trim, deice, etc, and getting all that through the fin into it.

Mike C.

Username Protected · **Posted:** 14 May 2015, 16:05

Quote:

Yeah, but that gear. Ugh.

I find that funny!

My first thought was that the gear was at least slightly reminiscent of that on an MU-2!

Username Protected · **Posted:** 14 May 2015, 16:10

I think the gear looks good. Looks like an F18 on a Carrier

Username Protected · **Posted:** 14 May 2015, 17:52

In the second picture the gear looks just like that on a venture

Username Protected · **Posted:** 14 May 2015, 18:42

Sure as hell wouldn't want to take a SJ30 to a grass strip.. ..The PC24 will do fine there. Horses for courses, I suppose.

Username Protected · **Posted:** 14 May 2015, 18:55

Username Protected wrote:

That gave them the better "look", but it will be a cost driver in maintenance. Think about all the stuff that goes into the horizontal stab: control, trim, deice, etc, and getting all that through the fin into it.

Mike C.

Umm, Ed didn't do it for looks. I wasn't on the team, but clearly it was an aerodynamic decision. Look at those wings too. Nice and thin. Really makes for a great high speed airfoil. Delayed Critical Mach number. The thing could probably do Mach 2 with the right engines :thumbup:

Username Protected · **Posted:** 14 May 2015, 20:32

Username Protected wrote:

My first thought was that the gear was at least slightly reminiscent of that on an MU-2! :D

No doubt. But with a high wing, there is no other good choice for main gear but into the fuselage.

On a low wing jet, the complexity of sticking the gear into the fuselage is stupid, IMO. The gear goes in the wing. Duh.

The SJ30 gear strut inflation pressures will be super critical or it will lean easily one side or another. Also, crosswinds will be a bit more wobbly with the narrow gear track. Further complicating that will be the relatively low wing tip clearance. It won't take much roll to scrape wing.

Mike C.