Hi everyone, my name is Marco and English is not my native language so please forgive my grammatical errors.
I am trying to build an electric hand trailer capable to move 400-420 kg at a more or less constant speed of 3.2-3.6 km/h both on paved and unpaved road (though not a completely rough bumpy road). My main inspiration comes from the Carla Cargo trailer (here is an image)
There are different models, but the main one can carry 150 kg. I like this design because it is relatively simple, cheap, wheels are not too high (20") and most of all it is missing a suspension system which would be too difficult for me to build. But considering the weight I need to move I don't know if such a deficiency is redeemable. I have many questions, of basically two types: 1) Wheel tolerance 2) Motor. I know that to answer my questions precisely there are too many variables to take into account, however I'm searching for a rough practical estimate (but if you want to share precise calculation I would be really happy too). So
1.1: In the Carla Cargo trailer 150 kg are distributed on two (maybe 2,5) wheels, which means about 75 kg per wheel. Is this assumption valid? Is it reproducible for higher loads? Would be enough to add two couples of wheels for a total of 6+1 wheels (75*6=450)?
1_2: Would using different type of wheels ( for mtb, fat bike, pitbike / made of steel, carbon fiber, special alloys) be necessary?
2.1: Are common ebike motors (like dapu M155CD) suitable for such high weights and low speed? Are special modifications needed (like changing the controller's program)?
2.2: 350-500 W motor would be enough?
If such a design is not scalable I have been thinking to use one or two braked trailer axles with elastic suspensions like the AL-KO B400 (which I don't consider ideal because of the distance from the ground (too high) and the market prices of the axles). In this case certainly weight wouldn't be a problem, but then would a propulsion given by an ebike wheel be appropriate for larger trailer wheels ( even connected to a braked axle)?
Thank you in advance for your suggestions.
I am trying to build an electric hand trailer capable to move 400-420 kg at a more or less constant speed of 3.2-3.6 km/h both on paved and unpaved road (though not a completely rough bumpy road). My main inspiration comes from the Carla Cargo trailer (here is an image)
There are different models, but the main one can carry 150 kg. I like this design because it is relatively simple, cheap, wheels are not too high (20") and most of all it is missing a suspension system which would be too difficult for me to build. But considering the weight I need to move I don't know if such a deficiency is redeemable. I have many questions, of basically two types: 1) Wheel tolerance 2) Motor. I know that to answer my questions precisely there are too many variables to take into account, however I'm searching for a rough practical estimate (but if you want to share precise calculation I would be really happy too). So
1.1: In the Carla Cargo trailer 150 kg are distributed on two (maybe 2,5) wheels, which means about 75 kg per wheel. Is this assumption valid? Is it reproducible for higher loads? Would be enough to add two couples of wheels for a total of 6+1 wheels (75*6=450)?
1_2: Would using different type of wheels ( for mtb, fat bike, pitbike / made of steel, carbon fiber, special alloys) be necessary?
2.1: Are common ebike motors (like dapu M155CD) suitable for such high weights and low speed? Are special modifications needed (like changing the controller's program)?
2.2: 350-500 W motor would be enough?
If such a design is not scalable I have been thinking to use one or two braked trailer axles with elastic suspensions like the AL-KO B400 (which I don't consider ideal because of the distance from the ground (too high) and the market prices of the axles). In this case certainly weight wouldn't be a problem, but then would a propulsion given by an ebike wheel be appropriate for larger trailer wheels ( even connected to a braked axle)?
Thank you in advance for your suggestions.