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Bike trailer drag ???????


Jokerman
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Bike racks and the drag impact on a vehicle ===========================================

I am considering buying a bike rack to be fitted on top of a trailer. But now I am slightly in doubt and would like to hear your opinion.

When comming back from the Kremetart I offered to tow a trailer for someone since my car was a bit more powerfull. Now this was a trailer purely made for transporting bicycles. It was actually quite a heavy trailer and I only had two bikes mounted on the trailer (in-line) thus the most aerodynamically position. Driving back to Pretoria, I noticed a radical increase in fuel consumption. Normal for the car is just over 7l/100 km and it went right up to almost 10l/100km. Initially I thought that the weight of the trailer might be the reason.

A couple of weeks ago, I went to collect a family at the Airport who flew up from Cape Town. Knowing that they were going to have a lot of luggage and that I would not make it with the available boot space, I borrowed my friends' trailor. Now this is one of these new Challanger lightweight goodies you buy at Makro. These poeple loaded the trailor full with their luggage and we were 5 adults in the car. Fuel consumption was 8.5l/100 km.

This got me thinking. What was the cause of the heavy fuel consumption back from Louis Trichardt. Could it have been the drag caused by the bicycles? If this is the case, I am seriously reconsidering this bike rack idea. Yesterday I saw an add for a Challanger trailor with a bike rack mounted at the back. Now although the bike mounted behind the trailer and not in a aerodynamic position, the trailer will break most of the wind and the drag factor should be less. This way I can mount 2 bikes on the rack and transport two more in the boot of the car and have pretty much the same benefit as having bike rike mounted on top of the trailer.

Those of you who have trailers with bike racks on. What are your experiences in this regard?

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Hey mampara, you have to give me stick there.  I had to ask Jokerman to post on my behalf since I can not create posts at the moment. LOL

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I nearly ran out of petrol driving into a headwind on the way back from Knysna towing a Venter with 4 bikes on top of it!!

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Ha,ha,ha,ha......................With my lenght being 1,96 it would have made a funny picture hey LOL

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It all depend on how low your car is or how high the trailer smiley36.gif . But it will add some figures to your fuel comsumption . I try not to tow the bike trailer and rather put bikes in back of bakkie .

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Yip, I know the guys with the 4 x 4 roof tents said that your consumption can go up by as much as 4 liters per 100km......depending on the type of vehicle and the type of roof rack

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yes it seriously impacts your consumption unless you have a diesel with plenty torque

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Yip' date=' I know the guys with the 4 x 4 roof tents said that your consumption can go up by as much as 4 liters per 100km......depending on the type of vehicle and the type of roof rack[/quote']

 

 

 

4 litres!!!

Good grief!

 

Who knew wind could be so pesky!

 

Naughty wind.

Naughy.

 

 

What the hell?

4 litres?

 

What kind of bedouin tent was that??

Sleep a family of 38?

 

ShockedLOL
RodTi2007-07-13 07:20:24
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I have a Challenger trailer with the rack at the back.  Just be aware that the rack does not have anything that holds the bikes away from each other.  I have damaged my wifes bike in this way

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I have a glider trailer with a 5bike rack on the back no probs of bike damage just fuel.So next car is a diesel

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I went from Revue in Moz to Petoorieja with the MTB tandem and two MTB's on the Venter. I showed no serious increase in fuel consumption. I guess the 3l KZTR Toyota is just better than the rest. I must also say we were packed to our limit with some of the camping goods stashed on top of the trailer betwen the bikes and a lot of stuff inside the double cab. She did not even notice it. Unfortunately I had to give her back to the Chaainiees Contractor.

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Hendrik would it be safe to assume that the profile of the bakkie canopy might have helped breaking the wind from the bicycles on the trailer.  This together than the bigger engined vehicle would result that the drag factor becomes a "none factor".

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Jokerman,

                 I am driving a BMW 330. At 129 kpu  my fuel cons. increases with 1 l./100km.  That is with a Thule 3 bike carrier with 2 bikes on it.
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