40" BEFU Scale Scarab for sport build thread

[befu]

Woo Hoo!!!!

Alright, went out and finally ran it again and I broke 30mph!

First run I put a plastic 447 3 blade on it from OSE.
It ran really nice, sounded good and JUMPED out of the hole. This works for sport running as it ran a consistent 21 to 20mph and current averaged around 40 to 42 amps. nice easy and cool setup. Plus I have about 8 of the 2200 - 3s turnigy batteries. voltage dropped to 3.67v/cell under load. With four of them in there, it would give me over 15 minutes of fun running and wave jumping! Now I just need a place with waves....

Second run, I put the standard x442 back on it, but ran it on 5s-10,000 to see if the extra battery capacity helped. It still ran a consistent 28mph with peaks of 29mph. Current peaked at 74 amps, but settled in to 62 amps on average. Not bad, but still not 30mph.

Third run I put a plastic 445 OSE prop on it. Speed hit 30mph and current was averaging 66 amps. Peak spike was 84 amps.

for the fourth run, I finally stepped this ESC up to 6s. now, the only setup I have for this is the 3s-2200 - 20c HK batteries at $10 each. so I put four of them in it for 6s - 4400 - 20c setup on the octura x442 prop. Speed was a consistent 31 to 33 mph , current spiked at 80 amps and settled into 62 to 64 amps. Oh, voltage dropped to 20.8 volts also under load, so these cheap batteries are really dropping down to 3.47v/cell. Not good.

boat ran really well on the last 6" of the hull. Exceeded my goal by 10% and mid 60 amps should be easy for the ESC and motor.

I really liked the 3s setup with the 447/3 blade prop also.

I am really happy with the results given this is a big boat at 40", designed to be more scale than race, and has a motor and ESC that cost $45 together! Offshore racing on the cheap!

Still do not have any turn fins or tabs on it, but a 40" deep vee really shouldn't need them at 30mph, so I will probably put some scale tabs on it and call it good.

no video, but I did get the eagle tree data if anyone wants to see a graph, but it just shows what I mentioned above.

Now to finish it and make it scale.

Brian

[ScarabChris]

Hey Brian I assume this is the hull you were talking about in your PM. It does have nice lines and I see potential. I do have a few questions about it.

[befu]

Current pics.

Hey Brian I assume this is the hull you were talking about in your PM. It does have nice lines and I see potential. I do have a few questions about it.

yes it is. Here are the pics of my boat as it sits now.

The hatch is vacuum formed, not sure I like it. Going to try it again with .060 plastic and see if it is better. Otherwise, I might just end up making a mold from the vacuum plug. It is still missing the bolsters and cabin details.

I also want to make a swim platform that can be attached to the back, the same as some of the "added" molded ones on the older hulls. the scarab that I was familiar with had it made from teak like a grate. Looked nice.

Boat looks really nice running.

[ScarabChris]

Can you make them with two different color gel coats? For example blue hull sides and white bottom and white deck?

I would likely make that another center console and strap 3 more BL EP1s on it.

[marko500]

Brian do you have the bolsters that came with the original hull or were you going to build some.

Mark

[befu]

I have never done two tone gelcoat. I have white, could get some blue coloring, but I do not know how it would turn out. Guess it would be worth a try!

Act within the next 30 minutes and you will get absolutely free "Scarab" decals for the sides! (Said in over hyped salesmanish voice)!

well, you already know I can do the vinyl stickers! I think it would look neat as a CC in this size. That would be 1/10 scale. I still think I want to redo one with twins in it with semi-scale outdrives. It would just be the right way to do it.

Brian

[befu]

Brian do you have the bolsters that came with the original hull or were you going to build some.

Mark

No I do not, I only had the fiberglass portion, nothing else. Got the hull in trade for something else way back when. why, do you have them?!?!?!?!?

Brian

[ScarabChris]

No big deal on the blue hull sides, I can paint it.

What are the following dimensions?

Total length overall (LOA)
Beam
Deadrise at transom
Freeboard from keel to the hull to deck joint
Freeboard on hullside at the transom to the hull to deck joint.

I'll need to see if it will work for a triple outboard, these EP1S may be a little short, especially the center motor. But I don't think there are any longer outboards out there.

[marko500]

Why it just so happens that I do!

Mark

[marko500]

I was thinking about this hull with 2 of the Stiletto outboards. You guys are the experts with these big hulls , think that will work?

Mark

[befu]

Why it just so happens that I do!

Mark

What other parts am I missing?

[marko500]

My sister bought this hull at a garage sale for $20 and gave it to my dad. It sat in his basement for years before he gave it to me. I untaped the hatch and inside was all the original parts, radio box, seats, radar arch, wire for bow rail, wood for stringers, assembly plans and directions, etc. This hull has no holes or even a pencil mark on it.

Mark

[befu]

What are the following dimensions?
Total length overall (LOA) = 39 3/8" from transom to nose
Beam Max beam is 10 7/8", beam at transom is 10 1/8"
Deadrise at transom Dead rise should be the standard 24 degrees
Freeboard from keel to the hull to underside of deck at hatches is 5 3/4"
Freeboard on hullside at the transom to the hull to deck joint. 2 5/8"
Freeboard on hullside at the windshield point is 3 3/8"

Please remember, there is no hull to deck joint on these, the joint is down the middle so I took it to where the side radius starts (about the old seam location)

I'll need to see if it will work for a triple outboard, these EP1S may be a little short, especially the center motor. But I don't think there are any longer outboards out there.

I could print out a picture of an outboard to full size and hang it off the transom. Would that work?

Brian

[befu]

I was thinking about this hull with 2 of the Stiletto outboards. You guys are the experts with these big hulls , think that will work?

Mark

I would think so, that is quite a bit of power in those. I would ask Darin what kind of power those outboards will hold up to. On 6s, my little outrunner was running around 1300 watts, almost 2hp. Will they take that much or more?

OSE site says they will take up to a 45mm prop and mine runs on a 42mm prop. i would say this boat would run with one of those motors on the back but speed would depend on how much wattage they will handle, I have no idea. the stock motor makes about 1hp on that outboard, so that would probably get you to 20ish mph? with two of them, you could get the boat scooting pretty good I would think.

So, could I get some dimensions and other shots of the bolsters? Also, any assembly instructions of the hatch would be helpful also. nothing on the boat, that is all really old setups and not being used in nitro anymore, let alone a FE boat.

Thanks, Brian

[marko500]

How were you going to build the seats. If you were going to make a mold of them would it save you any work or make it easier if I let you borrow the seat? The seat is one solid cast part.

Mark