Any recent experience of 5hp Parsun outboard

Graham376 said:
Yes, fully understand the OP's situation but I was wondering what effect length has on a planing dinghy/hull. We have a 2.9 inflatable which happily does 17/18 kts and I'm wondering whether to downsize a bit to 2.7.
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There is a complicated interaction of length, weight and power. If you get it wrong you will be stuck in displacement mode as you need that bit of extra power to get over the 'hump'. For a given weight a longer inflatable will draw less and get on the plane easier. I have had a 4m inflatable just planing with a Seagull outboard if I got the weight distribution just right. By moving forward the stern lifts and the stern wave detaches
A smaller inflatable will be limited in engine power, for example the Seago 270 is only 6HP which will probably not plane with 3 people onboard. I would stick with your 2.9m as using Seago as an example the relative weights are 39.3kg and 40.5kg but the 290 will take a 10HP outboard.
 
Tranona said:
You don't say which model Seago you have, but if it has an inflatable floor then it is rated to 5hp and will plane with one person and maybe 2 light people. Otherwise they are displacement boats and will not exceed maybe 4 knots . Really never intended for the sort of trip you made. They are for popping from boat to shore with a load. If you want to cover those distances then you need to go up in size and have an inflatable keel and a bigger engine to give you real planing performance.
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A Seago 240 spirit slated floor
 
andsarkit said:
How many people in the dinghy?
My 2.7m inflatable one up, planes very well with a 3.3 Mariner 2T but is back to displacement speed with 2 people.
I have an old Johnson 4HP twin 2T that has both internal and external tanks but is still too small to plane with 2 people.
When one up I find a tiller extension (piece of plastic tube) essential so that I can sit far enough forward to get the correct trim for planing.
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2adults + 10l fuel
 
Thanks, looking to upgrade both both and engine. The current Seago was the tender to my old sailboat ( only used from slip to morning and back)
 
Tranona said:
OP currently has a 2.4 which limits carrying capacity and ability to plane even with the maximum 5hp. Going up to a 2.7 doubles carrying capacity and a 6hp engine which is a much more capable boat for the sort of trip he made. Read the OP. I know that area extremely well - I can see it out of my bedroom window. It is approx 10 miles round trip but took him 5 hours because he went against the tide both ways, I guess either side of high water. So his 4 knots is immediately halved. Two lessons - first know your tides and don't go against with a displacement boat, and if you want to largely ignore tides get a bigger boat and engine that planes.
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You’ll struggle with that combo in terms of making good way (and certainly planing) with 2 up plus fuel.

We’ve got a relatively ‘high performance’ inflatable v-floor 310 (Boatworld Honwave clone) with a 5hp Tohatsu 2-stroke (both of which I’d highly recommend) and it’ll only plane comfortably with me (80kg) and that’s with liberal use of tiller extension.

That hp is just on the limit of any sort of reasonable speed, as/especially is the small 240 ‘tender’.

But well done for making such an adventurous trip, safely and successfully it sounds, in a small boat. Very swallows and amazons! ;)
 
Yep, thinking of Getty bigger boat but i am limited to one that can be carried in the back of a sharan + 2 upfront + engine & luggage!

As far as tides are concerned you go with what is available when on holiday. There would have been no point in returning at 7/8pm for that trip
 
Graham376 said:
Yes but, what effect does length have on speed of a powered inflatable, everything else being equal such as inflatable keel and engine size, bearing in mind larger length means more weight? Would you expect (say )a lighter 2.7 with same engine to be faster or slower than a 3m one?
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LOA is always proportional to hull speed, presumably making getting on the plane harder the smaller you go. I doubt the weight difference offsets that disadvantage. Then it’ll depend on max hp…
 
Tranona said:
OP currently has a 2.4 which limits carrying capacity and ability to plane even with the maximum 5hp. Going up to a 2.7 doubles carrying capacity and a 6hp engine which is a much more capable boat for the sort of trip he made. Read the OP. I know that area extremely well - I can see it out of my bedroom window. It is approx 10 miles round trip but took him 5 hours because he went against the tide both ways, I guess either side of high water. So his 4 knots is immediately halved. Two lessons - first know your tides and don't go against with a displacement boat, and if you want to largely ignore tides get a bigger boat and engine that planes.
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Hi
Thanks for your input. I am thinking of getting a bigger boat with a keel (with max hp for it) but it has to fit in the back of a Sharan (on the roof??) Any suggestions?

As far as the tides are concerned when on holiday you haven’t got the luxury of choosing. On the day I went out it would have meant waiting to 7pm to start the journey back …
 
Smallboat said:
Thanks for your input. I am thinking of getting a bigger boat with a keel (with max hp for it) but it has to fit in the back of a Sharan (on the roof??) Any suggestions?
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You might find this interesting reading from Nestaway. They are an established company and I would tend to believe their figures
They claim 14knots with a 6HP engine on a 4.5m inflatable with 2 people onboard.
Their prices are out of my league but it agrees with my experience that a lightly loaded larger inflatable will plane more easily. They also say it will fit in the back of a Golf when packed up.
 
andsarkit said:
You might find this interesting reading from Nestaway. They are an established company and I would tend to believe their figures
They claim 14knots with a 6HP engine on a 4.5m inflatable with 2 people onboard.
Their prices are out of my league but it agrees with my experience that a lightly loaded larger inflatable will plane more easily. They also say it will fit in the back of a Golf when packed up.
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Hi
Thanks, these look great. I also like the folding rib that the company produces.
I was wondering if I could get something similar in terms of passenger capacity (4) by looking at a direct import from China for less money

I found that on YouTube and the importer (3 videos about his boat) was happy with the built quality. The company also offer smaller models of inflatable and small rib

 
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