Strap a decent airspeed indicator on it ...... You increase your risk of running off the end of the runway if you fly a plane with an ASI not calibrated at takeoff roll speeds.
Hmmm. So Slim Slag knows better than Scottish Aviation who designed the thing and the RAF who used a fleet of of them over nearly 30 years, to say nothing of the CAA who have certified it for general use in this 'risky' condition.
Anyone out there know of a Bulldog which has run off the end of the runway???? I've just done a search and can't find any, but would be interested in anyone else's experience.
Lets assume, for the sake of argument, that the fleet of about 300 'dogs has flown 50 hrs each per year for 25 years (average lifespan over the fleet) - which makes 375,000 hours, which I would argue would involve a landing on average at least every hour (given that she is a trainer.)
So that would also mean 375,000 take offs .... so how many Bulldogs have run off the end of the runway out of an estimated 375,000 attempts? (Having flown a few hours in 'em, I reckon not too many, since they take off like rockets
)
In fact, the very reason that the Bulldog does not meet Slim Slag's 'rule'is that it has extremely good take off performance and requires a Vr of 45kias at about the same weight as a 4 seat PA28-181 requiring 65kias.
The examples of both types that I have flown have ASIs with a bottom stop of 40kias, so the latter can meet Slim Slag's 'rule' as 75% of Vr is 48kias, but the former cannot, because it's Vr is 20kias LESS meaning that 75% of Vr is an unmeasurable (if very healthy) 34kias, but this ASI calibration 'defect' apparently increases the risk of running off the end????
So, I think there's a bit of a logic problem here somewhere.
Now for another beauty.....
So if start at zero, and you brake properly at 50% of the runway length, you will always reach zero before the end.
ALWAYS ?????? - what if there is the mother and father of downslopes on the second half, what if it changes from tarmac to wet, long grass, what of the friction layer is considerably poorer on the second half than the first etc etc etc - oh and by the way, which POH for a light SEP did you read that quoted accelerate/stop distances?
Please let me know where I can get these for the PA28/PA32/B121/SA120 as I would gladly invest in them tomorrow.
I have to say, Slag, that your posts have given me much more entertainment that Coronation Street going to 5 days a week, please keep it up as I can't wait for the next episode