HM19 10hp cruising speed?

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Bogieman
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HM19 10hp cruising speed?

Post by Bogieman »

Hello,

What is the expected average cruising speed of the HM19 with the 10 hp? Will the 10hp push the boat faster than the displacement HMD19 version because of the flat bottom?

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Bogie

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Re: HM19 10hp cruising speed?

Post by jacquesmm »

Not with a 10 HP.
You"ll need at least 50 HP to get her on plane. I heard reports of her planing with a 30 but that is not confirmed.

BTW, those two very different boats.
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Re: HM19 10hp cruising speed?

Post by Bogieman »

jacquesmm wrote: Thu Feb 09, 2023 2:30 pm Not with a 10 HP.
You"ll need at least 50 HP to get her on plane. I heard reports of her planing with a 30 but that is not confirmed.

BTW, those two very different boats.
Hi Jacques! Hope you are well. I should've asked "what displacement speed will the HM19 travel at with the 10hp?" I see where it's specified for the HMD19. I have the plans for the HMD19 but I'm considering the HM19. I'd probably run it with the 10hp initially but like the option of planing with a bigger motor.
Bogie

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Re: HM19 10hp cruising speed?

Post by TomW1 »

Bogieman wrote: Thu Feb 09, 2023 6:59 pm
jacquesmm wrote: Thu Feb 09, 2023 2:30 pm Not with a 10 HP.
You"ll need at least 50 HP to get her on plane. I heard reports of her planing with a 30 but that is not confirmed.

BTW, those two very different boats.
Hi Jacques! Hope you are well. I should've asked "what displacement speed will the HM19 travel at with the 10hp?" I see where it's specified for the HMD19. I have the plans for the HMD19 but I'm considering the HM19. I'd probably run it with the 10hp initially but like the option of planing with a bigger motor.
Bogie
Depending on the weight on board you should probably expect 7-10mph's. Weight is always the determining factor in speed.

Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

Bogieman
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Re: HM19 10hp cruising speed?

Post by Bogieman »

TomW1 wrote: Thu Feb 09, 2023 9:36 pm
Bogieman wrote: Thu Feb 09, 2023 6:59 pm
jacquesmm wrote: Thu Feb 09, 2023 2:30 pm Not with a 10 HP.
You"ll need at least 50 HP to get her on plane. I heard reports of her planing with a 30 but that is not confirmed.

BTW, those two very different boats.
Hi Jacques! Hope you are well. I should've asked "what displacement speed will the HM19 travel at with the 10hp?" I see where it's specified for the HMD19. I have the plans for the HMD19 but I'm considering the HM19. I'd probably run it with the 10hp initially but like the option of planing with a bigger motor.
Bogie
Depending on the weight on board you should probably expect 7-10mph's. Weight is always the determining factor in speed.

Tom
Hi Tom! Thanks for sharing your expertise. That's exactly the answer I was hoping for.

Bogie

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Evan_Gatehouse
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Re: HM19 10hp cruising speed?

Post by Evan_Gatehouse »

5-6 knots maximum (6-7 mph)

Not a chance at 10 mph (8.7 knots)
designer: FB11/GV10,11,13/ HMD18/
SK17,MM21/MT24

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Re: HM19 10hp cruising speed?

Post by TomW1 »

Evan are you doing for the HM or the HMD. They are two very different boats. I would agree with you on the HMD. Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

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OrangeQuest
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Re: HM19 10hp cruising speed?

Post by OrangeQuest »

TomW1 wrote: Fri Feb 10, 2023 5:09 pm Evan are you doing for the HM or the HMD. They are two very different boats. I would agree with you on the HMD. Tom
In the pictures of both boats, the website seems to use the HMD pictures for both designs. Are the differences below the waterline? The description of the HM states that it does nicely at displacement speeds and a 10HP.
"that it isn't just an ordinary sort of boat. Sometimes it's a Boat, and sometimes it's more of an Accident. It all depends." "Depends on what?" "On whether I'm on the top of it or underneath it."
A. A. Milne

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Re: HM19 10hp cruising speed?

Post by Bogieman »

OrangeQuest wrote: Fri Feb 10, 2023 5:28 pm
TomW1 wrote: Fri Feb 10, 2023 5:09 pm Evan are you doing for the HM or the HMD. They are two very different boats. I would agree with you on the HMD. Tom
In the pictures of both boats, the website seems to use the HMD pictures for both designs. Are the differences below the waterline? The description of the HM states that it does nicely at displacement speeds and a 10HP.
Hi OQ!
Yes, the HMD19 has a V hull with a rocker bottom so it'll never plane. The HM19 has a flat bottom with no rocker and will plane.

Bogie

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Re: HM19 10hp cruising speed?

Post by TomW1 »

OrangeQuest wrote: Fri Feb 10, 2023 5:28 pm
TomW1 wrote: Fri Feb 10, 2023 5:09 pm Evan are you doing for the HM or the HMD. They are two very different boats. I would agree with you on the HMD. Tom
In the pictures of both boats, the website seems to use the HMD pictures for both designs. Are the differences below the waterline? The description of the HM states that it does nicely at displacement speeds and a 10HP.
Yes, the HMD is a displacement hull and HM is a planing hull much like the OD18. The difference in draft is 12" vs. 9" for each. The study plans even compares the HM to the OD.

Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

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