Fast boat hull mods

[@robprideaux3279]

Brilliant. Thanks for the video. I'm still in awe of the speed you get out of that little motor

[@25hpboatracerman]

Hi Mate, Thanks, I really appreciate your comments 😊 cheers 🍻 Aussie Boat Guy 😎

[@josephhalwagy6435]

Well done mate. You demonstrating great respect in boat design. I hope you and your family had a great Easter on the water on the C.C.

[@25hpboatracerman]

Thanks Mate 👍 Hope you and your family have an awesome Easter as well. cheers 🍻 Aussie Boat Guy 😎

[@ardynottle]

Always love your content, keep up the great work👍👍👍

[@25hpboatracerman]

Thanks champion, I appreciate your encouragement and will do! cheers 🍻 Aussie Boat Guy 😎

[@FYMM69]

Just found your channel and love to see others with same type passion for making tinnies the best they can be. These “lifting” chines you say, all these years I was under the impression they were for steering because without them sticking down into the water and say have a smooth bottom hull, when cornering the hull would tend to slide.

[@25hpboatracerman]

Hi Mate and welcome aboard 👍 Yeah, you are correct that a flat bottom boat will slide around in turns without sone sort of grip. Most tinnies have ribs pressed into the hull for rigidity but on glass hulls or alloy hulls where they are wanting better performance they place lifting strakes in certain areas with great success. You will probably be looking under all the boats you see now 😂 I still do, it’s super interesting. Cheers 🍻 Aussie Boat Guy 😎

[@metalsak1973]

You are always on experiments,and you follow a very nice road. Me,as a r.c fast boat enthusiast i like what you do a lot. In our hobby,we try to keep a little air on the V hulls and we grind the final triangle(as you mark with marker on video) with 600 grit paper,but straight to the water flow. Results are really good and gives a better speed,as eliminates the drag from friction. Also (in our small racers) V must be 100%straight as a hull leaves the mold! I talk for epoxy hulls,that IF they have a small curve on both side of V,the boat gets sticky and running "nose down". Some very fast V hulls,also have a straith ride pad on 30% of the boat lentgh. Cheers from Greece.

[@25hpboatracerman]

Thanks champion for your comments 👍 I agree with your testing and I would love to add a plank to the hull. Cheers 🍻 Aussie Boat Guy 😎

[@douger1517]

Brilliance how fun. Now we need more on the fish nipper please. But we love all the mods and advice.

[@25hpboatracerman]

Hi Mate, Thanks 🙏 Yeah, actually had the nipper out the other day, I nearly forgot how awesome it was 😂 cheers 🍻 Aussie Boat Guy 😎

[@bcbrando7678]

Good stuff as always!!! 🤟🏻🤟🏻🤟🏻

[@25hpboatracerman]

Cheers Mate 🍻 All the best Aussie Boat Guy 😎

[@bradleyfarquhar2023]

fantastic mate good stuff as always.

[@25hpboatracerman]

Thanks Mate 👍 All the best Aussie Boat Guy 😎

[@borismandrykin2761]

You are right! I passed frough the same exercise a couple of yers ago. You significantly maximised surfaces which push the boat up the water and reduced resistance. Try to make a video just after the transom. I made before and after each modification. Very interesting!

[@25hpboatracerman]

Thanks for your comment Champion 👍 The Jack plate made it possible to reach the speeds I was after plus it’s so easy to test different heights and adjust to suit each prop I try out. Cheers 🍻 Aussie Boat Guy 😎

[@gabenieto3113]

@theaussieboatguy what prop pitch would you recommend for a 9.8 tohatsu 2 stroke on a fairly light 12ft fiberglass boat?

[@25hpboatracerman]

Hi Mate, I would say the standard 8.5p would be perfect but if it’s struggling to get on the plane with two on board I would try the 7.5p. Cheers 🍻 Aussie Boat Guy 😎

[@gabenieto3113]

@@25hpboatracerman thanks mate!

[@IjanHaisah]

Omg nice vedio sir ❤❤ cant i ask what prop size u use sir 8inci or 9inci??

[@25hpboatracerman]

Hi Mate, There are some videos on the channel showing the propeller, it is a 15 pitch brass chopper propeller. Cheers 🍻 Aussie Boat Guy 😎

[@crashtestdummie67]

Cool! I have an old school Sun Rider waterscooter 8 foot with 80s Mercury 60 HP outboard motor. It's unstable above 38 knots. Tilting from side to side so I am going to make 1 cm deeper and them 10 cm flat at the bottom of the v. Racers do this to make the boats more stable. What do you think?

[@25hpboatracerman]

Hi Mate, I here you with the chine walking, it’s a very common problem. In saying that, a properly set up V hull without a pad can perform very well. Often the issues lie in play in the steering system, do you have a push pull cable? When we race boats we use cable steering to eliminate all steering play. I had a 125hp on a 12ft aluminum v hull with a 24 pitch race prop and was actually pretty settled to drive. Keep me posted mate, Cheers 🍻 Aussie boat Guy 😎

[@crashtestdummie67]

@@25hpboatracerman The steering is home made with dyneema rope from a big disc attached to the handlebar directed back with pulleys. The steering has no play and very little friction. But the whole system has a tiny amount of stretch in the rope and every part not making it 100 percent direct movement but extremely close. Thanks for your answer. Will let you know how it goes..

[@AquaMarine1000]

Stepped hulls are the new performance thing for big glass boats.

[@25hpboatracerman]

Hi Mate, Yeah, love the stepped hulls, such a good idea and love the way they work. cheers 🍻 Aussie Boat Guy 😎

[@independentthinker8930]

They also have a pad

[@Chickenmulletprawn]

Cool fun. Love the style of mods you do. Change test, tweak test etc. What's next, a Delta maybe?

[@25hpboatracerman]

Hi mate, Thanks, I really appreciate your comments 👍 I’m never sure what’s next 😂 whatever my crazy mind thinks of 🤦‍♂️ Actually, I’m trying to finish my Sea Wasp boat build but not in a rush on that. Cheers 🍻 Aussie Boat Guy 😎

[@menopiko]

Hello dear, Your app is great. Where can find it racing propeller for Honda 6 hp Pitch 7.5 Inch.

[@25hpboatracerman]

Hi Mate, Unfortunately I don’t know where to get a prop for that. All my small props I have modified out of other bigger props. Cheers 🍻 Aussie Boat Guy 😎

[@menopiko]

@@25hpboatracerman Ty for responding. ✋👍

[@hughesweldingservice]

I bet that boat would be awesome with a pad similar to an Allison or hydrostream

[@25hpboatracerman]

Hi Champion, Totally agree, would love a pad on that hull, I reckon it would be faster for sure. Cheers 🍻 Aussie Boat Guy 😎

[@tiller_gorilla7220]

I was wondering how it affected steering at speed,did it skip across more or did it still dig in on the turns

[@25hpboatracerman]

Hi Mate, Good question, it still tracks perfectly which is good. I was hoping that the boat would have less hull in the water but think I need a tad more speed for it to release the side sections. Cheers 🍻 Aussie Boat Guy 😎

[@tiller_gorilla7220]

@@25hpboatracerman speed or trim

[@DktheWelder]

good stuff , interesting ! Is a flat bottom fastest?

[@boatsandoutboards9070]

And handling would be the worst. If you can't keep a boat on a straight line, you can't go full throttle.

[@25hpboatracerman]

Hi Mate, Flat bottom boats can be super fast if set up correctly, steering is the issue and any chop or waves on the water are hell for anyone on board. Love your Channel mate 👍 cheers 🍻 Aussie Boat Guy 😎

[@pietlopsa9164]

More vids of this beast!

[@25hpboatracerman]

Hi Champion, Nearly there but do have a few more tweaks to come on that boat and motor setups. All the best 👍 Aussie Boat Guy 😎

[@81absolut]

Interesting project! Looks fast for a "8hp" 😂 What is the topspeed now?

[@25hpboatracerman]

Hi mate, I have modified that motor a lot, I put a video on the channel of all the mods to the powerhead and another on the lower unit with low water pickups if your interested. I have seen over 60kph so about 38mph. would love to see 40mph but not much more I can do to the motor. cheers 🍻 Aussie Boat Guy 😎

[@dionoakman9953]

The hose knows 😊

[@25hpboatracerman]

😂😂😂 The hose always knows cheers 🍻 Aussie Boat Guy 😎

[@DatBlueHusky]

you should get into long tails/mud motors

[@25hpboatracerman]

Hi Champion, Agree 😁 we will see, I do like the idea of the long tails 👍 cheers 🍻 Aussie Boat Guy 😎

[@a3_Beats]

I wish I could make a low water pickup mod for my 9.9 but I don’t have the skills or equipment to so it sadly, but one day I will buy a small race boat myself ( you can search up winrace 13 mk7) that’s the boat I’m tryna get. Ps it’s a Norwegian boat and I’m from norway

[@25hpboatracerman]

Hi Mate, I Know the 13 mk7, awesome boats and can handle some rough water 👌 You are lucky to have Olle over there with Winrace Propellers, they are truly works of art and perform really well. All the best Champion from Australia Cheers 🍻 Aussie Boat Guy 😎

[@riverdragonmarineservice441]

👍

[@25hpboatracerman]

Cheers Champ 🍻

[@jono999s]

That's a chine. For grip on the water 😂

[@25hpboatracerman]

Hi Mate, Nice 👍 You may have missed what I was trying to achieve. I did gain a further 2MPH and obviously still have a lot of grip on the water, it turns like a beast. Cheers 🍻 Aussie Boat Guy 😎

[@25hpboatracerman]

Hi Champion, Also should add, it was a strake and I changed it into a lifting strake. A chine is where the topside hull meets the bottom hull. I used to call all things chines before my shipwright mate corrected me, worth looking up too. Cheers 🍻 Aussie Boat Guy 😎

[@aidencronje736]

Is the flywheel lighted

[@25hpboatracerman]

Hi Mate, I didn’t lighten the flywheel as I’m not circuit racing so acceleration isn’t needed, just after top end speed. I put a video up on all the mods I did on that motor on the channel if you’d interested. cheers 🍻 Aussie Boat Guy 😎

[@aidencronje736]

@@25hpboatracerman does lighten flywheel take away low end torque

[@25hpboatracerman]

A lightened flywheel helps with accelerating from lower rpm, like out of a turn but really doesn’t affect top end speed once the motor has reached max rpm. cheers 🍻 Aussie Boat Guy 😎

[@aidencronje736]

@@25hpboatracerman I thought it would push some more top end revs