H&M intruder S twin

[DINO7]

I decided to make my intruder twin.
H&M rudder
TFL stingers
leopard 36/74 3270kv
swordfish 200A
nanotech 3S 4000mah 45C
octura x442r+l + 38mm 1.6pitch 3blade alu props

[Jeff Wohlt]

Excellent...do those cooling cans fit? What are they?

Drives may need to come down a bit

edit...nevermind...I thought they were 40mm cans but I know where to get them for 36.

[DINO7]

home made carbon motor plates clued with metal epoxy.

[DINO7]

motor plates are ready.bending brass tube and alignment of the flex..

[Jeff Wohlt]

Nice job...put small wedges under the rear of the motors to stop bouncing and take some stress off the mounts.

[Rumdog]

Why do we all think we need rear support? You dont see it in any land based r/c vehicles. There is way more abuse going on in my brushless emaxx with a 1520 than a boat sees.

[LarrysDrifter]

Why do we all think we need rear support? You dont see it in any land based r/c vehicles. There is way more abuse going on in my brushless emaxx with a 1520 than a boat sees.

I dont think all need a rear support.In my opinion,the only motors that would need a rear support have the end bells crimmped instead of screwed.Or it could just be using supports out of paranioa.

[Chilli]

RC trucks and cars also have a suspension to dampen shock and vibration. Those mounts are epoxied in CF plate. Dont underdestimate the pounding a boat takes going through the chop. If the motor was in a Williams motor mount (which obviously wouldnt fit in this application), I would agree with you . But in this case, I tend to agree with Jeff. Better safe than sorry.

[Rumdog]

Oh come on. How about the countless times we land upside down from ten feet up? It really depends on the motor and the material that is used for the end bells. Or... how well you attach your mount. I see tons of HPR and Mystic cats with a single CF motor mount with no rear support.

[Rumdog]

Dino, what was the single setup in this hull? I bet she's gonna rip!

[Fluid]

I don't care how they do it in cars or planes, these are BOATS.
It is poor engineering not to support the ends of long heavy motors due to the large lever arm and inertia they have. I torn out my share of simple "L"-shaped mounts on fast FE boats before I learned this lesson. Put a wedge (or preferably a wrap-around mount since the 'bounce' goes up and down) under the endbell of the long motors, you'll than me later.



.

[Rumdog]

OK. How about large outrunners?

[Chilli]

We have given our opinion. Let's not ruin Dino's thread.

[rearwheelin]

I don't think there are any well built single support mounts for larger motors, I havn't seen any. Looking at your pics , from what I can see I would support the ends because the motor weight could pop loose thoughs.....looks like there is only a small area on the mount whare its epoxied and they will be under a-lot of torque. Side plates or the L bend should be allmost as long or longer as the can on the motor side. I had L mounts in the sponsons in my twin MM and I cant even take them out without without tearing the fiberglass out of the floor of its sponsons (I made them out if aluminum flat and the boat has seen its share of blow overs at high speed and never any strength issues). The main thing on a motor mount is to distribute the motors wieght evenly through the mount, what ever style it may be............Making my own mount is one of my favorite parts of a build. I stopped using JB weld because its runny and kind of brittle depending on somethings. I used JB on the MM mounts and they will never come out because the L mount runs about 4'' under the can.....To each his own !...........

[ray schrauwen]

Nice build.

I'm waiting for my Drifter S in the mail.

I'm doing the same thing but, a more scale rudder. I have decided on Leopard 2860 5050Kv on 2S each, maybe 2S2P per side, we will see. I also have a pair of 3655 ARC's with 2800Kv good on 3S each.

We will see what condition this used hulll I bought is in first, then decide.

The 2860 cans are rated nicely at approx 1200 watts max. Don't really need that much power in a 26" boat.