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Old 12-15-2013, 05:14 PM   #1
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HP requirements

Does anyone have a formula for calculating the hp required to most efficiently tow the following behind a 43-45ft class A rv; hydraulic lift for 2 full size motorcycles, car with 2 kayaks on top and 2 bicycles on rear?
Thank you.
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Old 12-15-2013, 05:44 PM   #2
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Don't think you'll find a lift capable of holding 1,600 - 2000 lbs of motorcycle. Cruiserlift is rated at 1k. My 730 lb VTX plus the lift itself adds about 1,800 lbs to my rear axle.
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Old 12-15-2013, 06:26 PM   #3
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As an ex-automotive engineer, I can tell you that you:
A - have not provided near enough information to even start,
B - have not figured out that terrain is a large portion of the momentary power requirement at any speed.

It sounds like your best bet is a toy hauler trailer.
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Old 12-15-2013, 06:43 PM   #4
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With a 43-45 your going to start with a 400 anyways with options up to 600 in the newer models. As stated in previous posts there are a lot of variables. what kind of terrain are you going to be traveling in?If you in the flatlands most of the time then you could get away with less hp. You want to be a bad motorscooter then by all means get up into the 500 range.
As stated, hanging two fully dressed scooters on the rear is kinda heavy plus if you stick them in an enclosed trailer you'll keep them cleaner and away from prying hands. the car flat towed with kayaks is a mute thing and could be pulled with a 350 in most cases. all depends on how fast you want to get over the passes.
If it was my choice with a 43 footer, enclosed trailer with MC's in front with bikes and kayaks on the walls and the car in the back. everything locked up clean and safe.400-450 hp and tuned to at least 1600lbs/ft torque. humm baby!!!!
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Old 12-15-2013, 06:47 PM   #5
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Quote:
Originally Posted by 1jrbrooks00 View Post
Does anyone have a formula for calculating the hp required to most efficiently tow the following behind a 43-45ft class A rv; hydraulic lift for 2 full size motorcycles, car with 2 kayaks on top and 2 bicycles on rear?
Thank you.
. It's real simple, if I had a 43-45 ft MH I would probably want at least 500 HP at a minimum, and preferably 600 HP. You could pull what your talking about with 300 HP. But you can never have to much HP. The formula is to buy all the HP you can afford. Cost a lot of money and doesn't always work out very good to try and hot rod any rig and get much more HP. You can't beat stock HP.
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Old 12-15-2013, 06:53 PM   #6
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I seem to remember, (or dreamed it) a good rule of thumb is 10hp/foot so your talking 430-450 to start. I factor another 50hp for a trailer.

So your gonna need to start between 450-500hp. Much under that then you won't have proper cooler or stopping for the additional weight and drag of the toys.

I have a 40'+25' enclosed and wish I had 450. 400hp for bus alone is adequate.

If the DW loved me, I'd have a 600, blue flame from the pipe passing minivans up the grade.
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Old 12-15-2013, 07:21 PM   #7
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...I seem to remember, (or dreamed it) a good rule of thumb is 10hp/foot so your talking 430-450 to start. I factor another 50hp for a trailer...
I read the same thing...plus my coach is 41' and has a 400 HP ISL.
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Old 12-15-2013, 08:52 PM   #8
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Look at your GCVWR and HP rating and make sure you have at least 1 hp per 100 lbs. I'm going to guess that an enclosed with all you stuff will be about 26' long and weigh about 9500 lbs. A 43' tag coach, probably around 44,000 lbs. loaded for travel. So now we're at 53500 lbs. If you like to get on up the hill, I wouldn't go anything less than 525 hp. That's just a little under the formula I quoted, but a good place to start. One other thing, a 43' coach, a 26' trailer, a 3' tongue on the trailer, you're 72' long. This is not legal in a lot of states. However, a lot of folks travel over length with no problems. It all depends on what state you're in and the mood of the officer eyeballing your rig.
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Old 12-17-2013, 11:02 AM   #9
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We have a 43' and pull a trailer with a RZR and a rock crawler buggy on a flat bed. Loaded weight of the MH is 40,000#s give or take. The trailer is 9600#s. The 450hp 8.9 Cummins with 1250#s of torque handles it just fine. No problem with 11,400' pass west of Denver. My son has a similar rig with a 24' enclosed trailer and it works fine as well. As was mentioned, there is no such thing as too much power, but it is a big $$$$$$$ jump to go from a 450 hp MH to one with 600 hp. We're happy with 450 and 7.5 mpg.
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Old 12-18-2013, 09:59 AM   #10
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I have new info. Consider rocky mountains to flatland terrain. Total weight of loaded rv and towing 1 motorcycle on lift and auto on ground of 50,000 lbs. Will you calculate hp/torque needed? thanks for your help.
Richard
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Old 12-18-2013, 10:19 AM   #11
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Originally Posted by 1jrbrooks00 View Post
I have new info. Consider rocky mountains to flatland terrain. Total weight of loaded rv and towing 1 motorcycle on lift and auto on ground of 50,000 lbs. Will you calculate hp/torque needed? thanks for your help.
Richard
We're 50.000 pounds with coach full of gear, water, and fuel. We tow a Jeep so around 4.000 pounds there. Our 600 hp does everything we ask. Our neighbors have a 500 hp ( lighter coach) and tow a Suburban. They can keep up with us in most places on the Rockies. There is no replacement for more power, but we were also able to get along just fine in mountain driving with our 2 previous ISL 400's. You still get there, just a little slower and you're not going to passing very much slower traffic on hills.
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Old 12-18-2013, 11:47 AM   #12
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As much HP as you can get? I'm not sure how to calculate the "efficiently" part. That could get a bit complicated.
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Old 12-18-2013, 11:55 AM   #13
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500 hp and up......

Quote:
Originally Posted by 1jrbrooks00 View Post
I have new info. Consider rocky mountains to flatland terrain. Total weight of loaded rv and towing 1 motorcycle on lift and auto on ground of 50,000 lbs. Will you calculate hp/torque needed? thanks for your help.
Richard
The Coach that you are asking about(43-45') in the 50,000# range will come with a engine in it to do the job(400-500hp), the newer you go......you will see 600- 650hp engines
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