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Search: Posts Made By: PaulisHome
Showing results 1 to 35 of 73
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Forum: Private Flying
5th Apr 2020, 08:36
Replies: 70
Views: 12,835
Posted By PaulisHome

Your first statement is wrong, the second...

Your first statement is wrong, the second correct.

If there's a wind, we can take the view that there are two impact forces - a vertical one (same as if there was no wind) and a horizontal one...
Forum: Private Flying
1st Apr 2020, 08:28
Replies: 70
Views: 12,835
Posted By PaulisHome

It may be simple trigonometry, but you've done it...

It may be simple trigonometry, but you've done it wrong.

If the wind is constant all the way down, it will make no difference to the descent rate (and probably very little even if the wind does...
Forum: Private Flying
27th Nov 2019, 19:18
Replies: 34
Views: 11,227
Posted By PaulisHome

Very definitely. You've got so much more glide...

Very definitely. You've got so much more glide performance in a glider that if you don't use the airbrakes you probably won't land on the airfield, even if the rest of the circuit is exactly right. ...
Forum: Private Flying
27th Nov 2019, 16:23
Replies: 34
Views: 11,227
Posted By PaulisHome

May I beg to disagree? We teach fairly...

May I beg to disagree?

We teach fairly conventional circuits in gliding (I'm a UK Full Cat Instructor). They look fairly much like power circuits apart from having a diagonal leg joining downwind...
Forum: Private Flying
1st Mar 2018, 08:10
Replies: 69
Views: 14,293
Posted By PaulisHome

There's a good analysis by the BGA, LAA and BHPA...

There's a good analysis by the BGA, LAA and BHPA online. Google "An analysis of mid-air collisions involving UK registered civil aircraft".

In the 37 years since 1975, disregarding hang gliders,...
Forum: Private Flying
21st Feb 2018, 13:23
Replies: 69
Views: 14,293
Posted By PaulisHome

I've got one. I switch it on. It is almost...

I've got one. I switch it on. It is almost irrelevant to the ability of GA traffic to see me. A tinkerbox though, that just might work!

Paul
Forum: Private Flying
18th Feb 2018, 16:07
Replies: 69
Views: 14,293
Posted By PaulisHome

It would certainly have the effect of reducing...

It would certainly have the effect of reducing the threat when the wings softened and folded up!

Paul
Forum: Private Flying
18th Feb 2018, 10:26
Replies: 69
Views: 14,293
Posted By PaulisHome

Making gliders visible to GA aircraft

Please consider making a donation to help upgrade the OGN network in areas we all frequently fly so that gliders can be seen on the PilotAware traffic awareness system increasingly carried by General...
Forum: Private Flying
9th Feb 2018, 08:30
Replies: 9
Views: 2,839
Posted By PaulisHome

For new aircraft, I agree. But what about second...

For new aircraft, I agree. But what about second hand aircraft? In this case, the VAT would have been paid in the EU. If it's then bought and imported, is VAT due? It would be, AIUI if it was...
Forum: Private Flying
7th Feb 2018, 07:39
Replies: 9
Views: 2,839
Posted By PaulisHome

More generally, what will happen to buying second...

More generally, what will happen to buying second hand aircraft from the continent, if and when we leave the EU?

AIUI we will no longer be part of the common VAT regime. So does that mean that...
Forum: Private Flying
31st Jan 2018, 07:45
Replies: 106
Views: 33,572
Posted By PaulisHome

It's like the rest of Brexit. If we put lots of...

It's like the rest of Brexit. If we put lots of effort in, are clever and very lucky, we'll only damage ourselves a bit. If we are careless or unlucky, we'll damage ourselves a lot. The current...
Forum: Private Flying
10th Nov 2017, 18:00
Replies: 8
Views: 3,254
Posted By PaulisHome

Not entirely true - at my club we've trained tug...

Not entirely true - at my club we've trained tug pilots without gliding experience. It's worth talking to your local club if you're keen - they might be in need of new tug pilots. The environment...
Forum: Private Flying
1st Nov 2017, 14:45
Replies: 45
Views: 34,840
Posted By PaulisHome

The co-efficient of lift is dimensionless. ...

The co-efficient of lift is dimensionless.

Lift = 1/2 * density of air (rho) * velocity squared * wing area * Coefficient of lift.

Lift is in Newtons (a force, which has units kg*m/s^2)
...
Forum: Private Flying
1st Nov 2017, 09:51
Replies: 45
Views: 34,840
Posted By PaulisHome

Oh, good - a physics problem. Let's get rid...

Oh, good - a physics problem.

Let's get rid of all the ideas that 'the momentum' of an aircraft somehow reduces its susceptibility to turbulence. Momentum has no effect on how an aircraft moves...
Forum: Private Flying
5th Oct 2017, 17:19
Replies: 30
Views: 7,328
Posted By PaulisHome

Cats 5: I think I know a couple like that...

Cats 5:

I think I know a couple like that at my club!

Paul
Forum: Private Flying
29th Mar 2017, 07:37
Replies: 15
Views: 4,369
Posted By PaulisHome

It's not Sky Demon per se, it's the original...

It's not Sky Demon per se, it's the original NOTAM which specifies the 23nm circle. All it means is that the NOTAM may be of interest to someone within that radius.

Paul
Forum: Private Flying
23rd Mar 2017, 20:28
Replies: 56
Views: 17,655
Posted By PaulisHome

I think this whole thing is a tough problem,...

I think this whole thing is a tough problem, though I don't think anyone is suggesting that everyone should adopt Flarm. I can think of lots of cases where multiple technologies existed for a while...
Forum: Private Flying
23rd Mar 2017, 19:14
Replies: 56
Views: 17,655
Posted By PaulisHome

Make up your mind Jan, are you going with...

Make up your mind Jan, are you going with 'cheapest consumer electronics' or not? (Not that Flarm is, actually, that).

But more importantly, in the UK at least, probably 75% of gliders flying...
Forum: Private Flying
20th Mar 2017, 08:55
Replies: 56
Views: 17,655
Posted By PaulisHome

We need yet another 'standard' for transmitting...

We need yet another 'standard' for transmitting position like a hole in the head.

Let's think: Mode S. ADSB. Flarm. Pilot Aware. Now this. Too much confusion over standards merely leads to...
Forum: Private Flying
13th Mar 2017, 09:13
Replies: 41
Views: 7,297
Posted By PaulisHome

Providing revalidating after expiry adds no more...

Providing revalidating after expiry adds no more time to the next revalidation period (ie it runs from the old expiry, not the new revalidation), then when the signature is obtained makes no...
Forum: Private Flying
12th Mar 2017, 15:26
Replies: 41
Views: 7,297
Posted By PaulisHome

That's correct. Clearly you shouldn't fly, but...

That's correct. Clearly you shouldn't fly, but is there a reason why you shouldn't revalidate? I just can't see one.

Paul
Forum: Private Flying
10th Mar 2017, 15:59
Replies: 41
Views: 7,297
Posted By PaulisHome

Without for a moment disagreeing with the advice...

Without for a moment disagreeing with the advice on this thread....

I can't think of a good reason why the CAA should take the position that they have - that is why it is a good thing to insist on...
Forum: Private Flying
14th Feb 2017, 14:51
Replies: 214
Views: 27,994
Posted By PaulisHome

For those wanting to talk about flying, rather...

For those wanting to talk about flying, rather than physics, look away now.







Scifi, Most of what you say is true, but your conclusions are wrong - at least if you're trying to imply...
Forum: Private Flying
8th Feb 2017, 07:54
Replies: 214
Views: 27,994
Posted By PaulisHome

Good question. I think it depends on how you...

Good question. I think it depends on how you model the gusts. If we model the gust as instantaneous say +/- 5 kts in the horizontal layer, say for 100m (don't ask how for a moment), then despite the...
Forum: Private Flying
7th Feb 2017, 13:25
Replies: 214
Views: 27,994
Posted By PaulisHome

From the wings. I'm using the proper definition...

From the wings. I'm using the proper definition of acceleration here (not just confined to the fore/aft axis). So if the ground speed is varying then either the airspeed is varying, or the...
Forum: Private Flying
7th Feb 2017, 10:56
Replies: 214
Views: 27,994
Posted By PaulisHome

It would read zero. All the acceleration is...

It would read zero. All the acceleration is normal to the aircraft as you imply. Airspeed would stay the same, groundspeed would vary (assuming there was a wind).

Still true to say that if the...
Forum: Private Flying
7th Feb 2017, 07:43
Replies: 214
Views: 27,994
Posted By PaulisHome

Hi Megan You seem confused. On the one hand...

Hi Megan

You seem confused. On the one hand you say "You are not accelerating". On the other, you say "The only acceleration an aircraft experiences ... is that of "g" in its vertical axis,...
Forum: Private Flying
6th Feb 2017, 17:38
Replies: 214
Views: 27,994
Posted By PaulisHome

Well, if you really want your head to hurt..... ...

Well, if you really want your head to hurt.....

As I'm sitting typing this, I am in fact accelerating at 1g upwards, pushed by the force from my chair. Relative to me, the inertial frame of...
Forum: Private Flying
6th Feb 2017, 15:32
Replies: 214
Views: 27,994
Posted By PaulisHome

Might I hazard a guess, Maxred, that you're not a...

Might I hazard a guess, Maxred, that you're not a physicist?

That force that car passengers experience? Caused by acceleration - whether it's along the line of travel or sideways. (Newton's...
Forum: Private Flying
6th Feb 2017, 08:01
Replies: 20
Views: 3,802
Posted By PaulisHome

Neat. Less scary than you might think - it's...

Neat. Less scary than you might think - it's pretty much what you do when bungee launching a glider.

All the bungee does is give you an initial push. After that, you're relying on the ground...
Forum: Private Flying
6th Feb 2017, 07:50
Replies: 214
Views: 27,994
Posted By PaulisHome

Sorry Megan, Heston is right. If you change...

Sorry Megan, Heston is right.

If you change the ground speed, you have accelerated. You can accelerate without changing your airspeed. You do it every time you make a turn - the aircraft is...
Forum: Private Flying
3rd Feb 2017, 08:11
Replies: 214
Views: 27,994
Posted By PaulisHome

And at the risk of confusing people, I thought...

And at the risk of confusing people, I thought I'd share the following.

Some sea birds have a rather neat trick called dynamic soaring. It uses wind gradient to stay airborne without flapping...
Forum: Private Flying
3rd Feb 2017, 08:01
Replies: 214
Views: 27,994
Posted By PaulisHome

I agree entirely Cats 5, which is why we don't...

I agree entirely Cats 5, which is why we don't fly slow in a finals turn.

But in principle I agree with n5296s too. It should be entirely possible to recover from an incipient spin in much less...
Forum: Private Flying
2nd Feb 2017, 16:56
Replies: 214
Views: 27,994
Posted By PaulisHome

Meikleour Yes. If the aircraft is...

Meikleour



Yes. If the aircraft is moving from an airmass moving at one speed, to an airmass moving at another, then inertia is an issue in the sense that it will take time for the aircraft to...
Forum: Private Flying
2nd Feb 2017, 13:42
Replies: 214
Views: 27,994
Posted By PaulisHome

It's real, though, doing the sums, probably not...

It's real, though, doing the sums, probably not very big. There's a bigger effect due to the wings doing different speeds due to the geometry of the turn.

Take an aircraft with 20m wingspan doing...
Showing results 1 to 35 of 73
 
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