Splendid illustration, tod.branko. 
The aerodynamics of an open top box at speed
- Thread starter Gone in 60
- Start date
Top boxes...that's what my KLR650 is for.
GoldOxide_imp
Road warrior
Another sketch!tod.branko_imp said:I'm not an expert in aerodynamics but i know that the bikes with screens tend to create an airflow that rolls forward from the back of the bike (basically turbulence) that was one of major quirks of that old Honda 800, what was it's name... Pacific Coast, yes. It would create this bubble that would keep smacking you in the back of the head constantly. I think it has something to do with creating a vacuum behind the windscreen and then the air would rush forward to fill up the negative pressure (but don't quote me on that), that's one of the reasons modern screens have some vents at the bottom to allow some air to fill up the bubble of negative pressure and reduce turbulence.
Anyways I think that could effectively keep the top box open.
I've only ever had one bike with a top box, it was a maxi scooter - Aprilia Atlantic 500. It was a Givi box, and fortunately I haven't had any issues with it, and the Mrs enjoyed having a backrest. The bike, on the other hand, was utter garbage, and I couldn't get rid of it soon enough.
I did forget to close my tank bag on a few occasions and I think it was only pure luck that saved me from losing all my stuff
'14 CB1100 STD 5 speed
Tod: You should open a "gallery" thread. Early works are sometimes in most demand.
tod.branko_imp
Been there
Another sketch!GoldOxide_imp said:Another sketch!tod.branko_imp said:I'm not an expert in aerodynamics but i know that the bikes with screens tend to create an airflow that rolls forward from the back of the bike (basically turbulence) that was one of major quirks of that old Honda 800, what was it's name... Pacific Coast, yes. It would create this bubble that would keep smacking you in the back of the head constantly. I think it has something to do with creating a vacuum behind the windscreen and then the air would rush forward to fill up the negative pressure (but don't quote me on that), that's one of the reasons modern screens have some vents at the bottom to allow some air to fill up the bubble of negative pressure and reduce turbulence.
Anyways I think that could effectively keep the top box open.
I've only ever had one bike with a top box, it was a maxi scooter - Aprilia Atlantic 500. It was a Givi box, and fortunately I haven't had any issues with it, and the Mrs enjoyed having a backrest. The bike, on the other hand, was utter garbage, and I couldn't get rid of it soon enough.
I did forget to close my tank bag on a few occasions and I think it was only pure luck that saved me from losing all my stuff
'14 CB1100 STD 5 speed
Tod: You should open a "gallery" thread. Early works are sometimes in most demand.
Tod: You should open a "gallery" thread. Early works are sometimes in most demand.
'14 CB1100 STD 5 speed
Houtman_imp
Road warrior
Cave men did something similar when sketching animals on the walls of their living quarters, and people are still in awe over their art.
clearviewx
Been there
Gone in 60' :rofl::rofl:Gone in 60_imp said:
GoldOxide_imp
Road warrior
Some might view that as an opportunistic feature. 
Are you sure it's not the flux capacitor warming up?
Houtman_imp
Road warrior
A new variation on " my dog eat my home work " Teacher , I lost my home assignment as the lid blew open on my top box and the papers flew out !
GoldOxide_imp
Road warrior
... maybe a bit slow here, but ...Gone in 60_imp said:
"Ferret in the tub"?
(Nice Marmot)
Gone in 60
Road warrior
Thread starter
Tod, when I first glanced at your sketch, I got a totally different idea of what you were going for... until I took a closer look.
GO.... Apparently you're not a bowler.
GO.... Apparently you're not a bowler.
flynrider
Road warrior
This is an interesting thread. I have a Hepco & Becker Journey 40 top case on my CB and I only lock the top box when I leave something in it that I don't want to have stolen. I've had it over 80 mph and it's never popped open. I think the difference might be in the latching mechanism. Even when it's unlocked, the latch stays engaged with the lid.
peterbaron
Road warrior
My Givi top box passed rev limiter test 2 x....and Lord Popgun has a Givi as well...
The only difference between our top boxes is that mine keeps beer cooler 2x longer than his....if it is previously cooled in a fridge
:banana:
The only difference between our top boxes is that mine keeps beer cooler 2x longer than his....if it is previously cooled in a fridge
:banana:
Lord Popgun
Road warrior
At this point I have to ask, What is a fridge? Sounds kinda familiar, but can’t place it.
Houtman_imp
Road warrior
Lucas refrigerators is the reason that English people drink warm beer.
peterbaron
Road warrior
Not just Lucas fridges but also 6V Lucas electrics found in old motorcycles :huh:
flynrider
Road warrior
I owned a late 60s Triumph with Lucas electrics. That bike nearly drove me insane. I actually used to carry a big 5 cell flashlight to strap on the handlebars if I rode it at night.
peterbaron
Road warrior
This is what I meant....problems......any opinions about Magneti Marelli ???
GoldOxide_imp
Road warrior
Yeah, I suppose not. Well, I've bowled many times, but definitely lack the literacy. Hmm, just speaking the other day how all the bowling alleys in the local region have closed for good. (*sigh*)Gone in 60_imp said:
