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Search: Posts Made By: Flash131
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Forum: Aviation History and Nostalgia
19th Jun 2018, 11:21
Replies: 55
Views: 17,840
Posted By Flash131

A life well lived

Like many here, I will remember John for his clarity of thought and precision with words. His vivid, simple, and accurate explanations of difficult concepts were often the last word on a subject.
...
Forum: Tech Log
2nd Aug 2013, 08:32
Replies: 37
Views: 14,338
Posted By Flash131

I previously posted this explanation elsewhere on...

I previously posted this explanation elsewhere on this forum. Perhaps not the classic explanation of dihedral effect, but it works for me:

Consider the flow over an unswept, untapered wing with...
Forum: Tech Log
9th Jun 2013, 19:12
Replies: 40
Views: 12,983
Posted By Flash131

Perhaps the easiest way to visualise the effect...

Perhaps the easiest way to visualise the effect of geometric dihedral on a slipping aircraft is to consider the flow over a wing that is both unswept and untapered.

Let’s imagine a streamline...
Forum: Flight Testing
21st Nov 2012, 08:16
Replies: 6
Views: 3,200
Posted By Flash131

The standard way to calibrate strain gauges is...

The standard way to calibrate strain gauges is with a 'four point bending rig'. This puts a section of a beam in constant bending with no shear. An alternative is to use a cantilever beam, with the...
Forum: Flight Testing
22nd May 2012, 09:54
Replies: 20
Views: 12,070
Posted By Flash131

The 20 second dive plus 1.5g pull-up may not have...

The 20 second dive plus 1.5g pull-up may not have been flown before. The rules allow the design dive speed to be established from a ‘rational analysis’ of this manoeuvre. There is no requirement to...
Forum: Flight Testing
2nd May 2012, 20:02
Replies: 17
Views: 11,067
Posted By Flash131

Your PFTS criterion makes sense. It would be...

Your PFTS criterion makes sense. It would be interesting to know if there is a wider correlation between PFTS and stall-spin accident rates amongst the GA fleet as a whole.

F.
Forum: Flight Testing
2nd May 2012, 12:11
Replies: 17
Views: 11,067
Posted By Flash131

Thanks Genghis. Point taken that heavier...

Thanks Genghis.

Point taken that heavier aircraft have lower manoeuvre limit load factors. However, the rule still allows pilots of lighter aircraft to pull the wings off more easily. It is as if...
Forum: Flight Testing
2nd May 2012, 09:59
Replies: 17
Views: 11,067
Posted By Flash131

Minimum stick force gradient

FAR 23.155 specifies the minimum allowable stick force per g as a function of aircraft gross weight and manoeuvre limit load factor. The latter linkage makes sense in protecting the airframe from...
Forum: Flight Testing
20th Apr 2012, 12:39
Replies: 7
Views: 2,829
Posted By Flash131

I have now consulted SAE AS8004. It does not...

I have now consulted SAE AS8004. It does not specify the sensitivity of the slip instrument. Any other suggestions?
Forum: Flight Testing
17th Apr 2012, 22:42
Replies: 7
Views: 2,829
Posted By Flash131

Yes, my query was prompted by Icon's claim that...

Yes, my query was prompted by Icon's claim that they had demonstrated that the A5 complies with the requirements to be certified as spin resistant.
Forum: Flight Testing
15th Apr 2012, 21:16
Replies: 7
Views: 2,829
Posted By Flash131

Ball width

FAR 23.221 requires stall demonstrations with one ball width displacement on the slip-skid indicator. However, I have yet to find a matching specification for the sensitivity of the slip indicator....
Forum: Tech Log
17th Mar 2012, 07:00
Replies: 39
Views: 18,331
Posted By Flash131

It is not just those looking for war trophies....

It is not just those looking for war trophies. Someone has to clear up the mess. We had to clear the road to Basra of burnt out armour holding up our advance. As you might imagine, it is not easy to...
Forum: Tech Log
12th Mar 2012, 21:19
Replies: 19
Views: 5,219
Posted By Flash131

Italia: Well caught, my terminology was less than...

Italia: Well caught, my terminology was less than rigorous. But then again, if we include compressibility effects, we should also take into account such things as the change in the fin lift curve...
Forum: Tech Log
11th Mar 2012, 21:56
Replies: 68
Views: 23,430
Posted By Flash131

FlightPathOBN: Sorry, my wording was less than...

FlightPathOBN: Sorry, my wording was less than rigorous. I was really alluding to the spanwise gradient of the lift distribution at the tip tending to be steeper if the wing is outboard loaded. There...
Forum: Tech Log
10th Mar 2012, 19:27
Replies: 19
Views: 5,219
Posted By Flash131

A non-mathematical explanation as to why yaw...

A non-mathematical explanation as to why yaw damping decreases with altitude:

Imagine sitting, facing forward, on the tail of an aircraft that is yawing (i.e. the yaw angle is increasing...
Forum: Flight Testing
10th Mar 2012, 10:11
Replies: 16
Views: 6,245
Posted By Flash131

The tail of an aircraft that is rotating in pitch...

The tail of an aircraft that is rotating in pitch sees a change in apparent incidence relative to flying at a constant pitch angle. The resulting change in tail lift acts to oppose the rotation and...
Forum: Tech Log
10th Mar 2012, 08:27
Replies: 68
Views: 23,430
Posted By Flash131

OG: Great explanation mate. Regarding...

OG: Great explanation mate.

Regarding retrofits to early designs, am I right in thinking that their wings were typically more highly outboard loaded than current practice (to minimise wave drag...
Forum: Tech Log
20th Aug 2009, 09:47
Replies: 0
Views: 624
Posted By Flash131

Development cost: Commuter v Transport categories

Does anyone have an idea of the relative costs of developing an aircraft under FAR23 Commuter category versus the FAR25 Transport category (or the EASA equivalents)?

In other words, what is the...
Showing results 1 to 18 of 18


 
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