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Forum: Tech Log

23rd Mar 2006, 18:23

Replies: 86

Pulling a Stop to Runway Overruns

Views: 18,501

Posted By RatherBeFlying

The front and rear spoilers of F1 cars are...

The front and rear spoilers of F1 cars are mounted very close to the two sets of gear. I suspect that the downforce vectors are located between the axles, in which case there is no unloading of an...

Forum: Tech Log

15th Jan 2006, 23:54

Replies: 86

Pulling a Stop to Runway Overruns

Views: 18,501

Posted By RatherBeFlying

More Fun with Figures

Have finally been driven to pull out my '72 edition of Kermode's Mechanics of Flight. Appendix 2 presents acceleration formulae in various units.

Taking 4b. F = (W/g)a:
a 744 at 644,000 lbs...

Forum: Tech Log

10th Jan 2006, 01:40

Replies: 86

Pulling a Stop to Runway Overruns

Views: 18,501

Posted By RatherBeFlying

Re: Pulling a Stop to Runway Overruns

Static loads while parked and dynamic loads while braking are different cases with greater nose wheel loadings under braking.
Having scuffed my shoes on snow covered runway surfaces, I can testify...

Forum: Tech Log

9th Jan 2006, 23:37

Replies: 86

Pulling a Stop to Runway Overruns

Views: 18,501

Posted By RatherBeFlying

NoseWheel not a Fulcrum

The fulcrum on the ground is the maingear axle. Backstick produces down force at the tail which: Adds to the total load on all gears Produces a nose up moment which relieves a portion of the load on...

Forum: Tech Log

8th Jan 2006, 01:35

Replies: 86

Pulling a Stop to Runway Overruns

Views: 18,501

Posted By RatherBeFlying

Fulcrum? -- Which Fulcrum?

Shadow,

Quite correct -- rubbing out the runway (aka. taking off) changes the fulcrum of pitch moments from the maingear to the CG and can reverse the direction of moments from spoilers and...

Forum: Tech Log

7th Jan 2006, 16:45

Replies: 86

Pulling a Stop to Runway Overruns

Views: 18,501

Posted By RatherBeFlying

Correction

I earlier commented that reverse from engines under the wing would produce a nose-down pitching moment.

On further reflection, I realise that reverse can produce a nose-up moment about the...

Forum: Tech Log

5th Jan 2006, 16:40

Replies: 86

Pulling a Stop to Runway Overruns

Views: 18,501

Posted By RatherBeFlying

A long way to go from Basic Physics to Approved SOPs

I see people advocating a procedure that potentially may improve braking, especially in contaminated conditions -- and I do agree with the underlying physics.
But it's a long way from basic physics...

Forum: Tech Log

5th Jan 2006, 12:19

Replies: 86

Pulling a Stop to Runway Overruns

Views: 18,501

Posted By RatherBeFlying

Re: Pulling a Stop to Runway Overruns

HS,
You are likely correct wrt the direct pitching moment from the spoilers on these 2 types, although there may be some subtraction as a result of lift dumping.
As far as the pitching moment from...

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