GeorgeTelford wrote:Hi Rik
Yes the length is against it being as good has the Tatra 77a
The main thrust of my post, was that you were incorrect in saying that the teardrop shape was only thought to be aerodynamic. it is actually pretty aero/low drag not the best and nowhere near the Tatra but better than many modern cars.
angib wrote:That Cd figure doesn't sound plausible ... According to my Tatra book, the 77a did 150km/hr on 75bhp and the 87 did 160km/hr on 75bhp, so the 77a probably has a higher Cd than the 87's 0.36.
GeorgeTelford wrote:
I cannot accept your calculation as proof, a main battle tank as a massive HP rating, but a mini as a higher top speed and both have terrible CD numbers, one would also have to assume that the correct gearing and final drive were employed, not all vehicles are geared for maximum terminal velocity. What I am trying to say is that CD based on number crunching or reverse engineering the top speed is a guess at best.
angib wrote:The Tatra 87 (very similar body shape) was claimed to have a Cd of 0.244 from a 1/5th scale wind tunnel model test, but the claimed top speed gave a calculated Cd of 0.31. In 1979 a real 87 from the Deutsches Museum was put in VW's wind tunnel and the result was a Cd of 0.36.
Surely someone would have corrected a 70 year old mistake by now
R Keller wrote:OK Gage, thanks for the demonstration of your maturity level. I think you proved my point quite nicely. Can you please go and inflict yourself on another thread now that you've done your best to kill this one?..........
Heck, even your Road Toad could be considered a Teardrop.Gage wrote:If you can't stand in it, it's a teardrop. If it's shaped like a Grasshopper, it's just not a traditional teardrop but it's still considered a teardrop. Some people here on the left coast get real sticky about what a teardrop is and still let a grasshopper 'style' teardrop in Teardrop 'only' gatherings.
Enjoy what you build and have a good day.
R Keller wrote:Now back to the topic:Rik
wentzzee wrote:I've spent quite a bit of time plundering around this site. I have seen every shape and form of tiny trailers. Tears, square tears and everything from squidgets to midgets. Grasshoppers and such. Question is....
Are the non tear shaped such as grasshoppers...square tears ect. still considered teardrops? I am asking for a reason.....I kinda like the grasshopper body style and was wondering if I built one would I be ostracisied for being different?????????????????????
wentzzee wrote:I appreciate all the responses....................Wifey suggested do a Grasshopper and paint the silouette of a teardrop then the rest sky blue so it would blend in with the sky.. She said it would look kinda cosmic and given just a quick glance no one would notice.............
Steve_Cox wrote:Geez, I had a senior moment and skipped pages 2 and 3.... Did I miss anything?
Steve In St Augustine
february1966 wrote:.... How could the trailer's shape effect mpg or speed at all? Provided the trailer fits inside the profile of the tow vehicle and is, therefore, drafting....
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