Matt's Geronimo

Designs for inboard or outboard power

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neel thompson
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Re: Matt's Geronimo

Post by neel thompson » Fri Aug 24, 2018 2:59 am

Matt.… I have a Checkmate boat that has a hinged tongue on the trailer. The hinge is actually aft of the winch tower. So to swing it, I unhook the winch strap and safety chain from the bow eye and swing the whole thing. It leaves me with the length of the trailer being the same length as the boat. Not sure from your pictures if you have enough room aft of the tower to do it that way. Just a thought if you ever hinge it.... Neel

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hoodman
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Re: Matt's Geronimo

Post by hoodman » Fri Aug 24, 2018 5:00 am

Neel, I won't be able to do that but I will be able to hinge back about 32 inches of length off the tongue. Enough to get it in the garage a lot better than it is now. They make the garages in these production houses pretty small. It's actually about a foot smaller in both directions than what the listing said. I was pretty pissed about that.
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

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hoodman
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Re: Matt's Geronimo

Post by hoodman » Fri Aug 24, 2018 5:02 pm

I took the boat out again today by myself. The trailer setup is better. I'll get the hang of it eventually. There was no traffic on the lake this afternoon so I got to do some more aggressive driving. With just me in the boat I have to trim all the way down for takeoff. When I punch the throttle she just about jumps on plane and I'm at 30+ mph before I even realize it. Wide open I'm hitting the rev limiter at 6000 and about 38 mph. Nothing weird happens when it hits the limiter it just pegs at 6000. No hint of porpoising at WOT even with the motor trimmed up. Throttle response and acceleration is instant. One thing I noticed is that the hull actually stays pretty flat in turns. I guess that's from the relatively shallow deadrise. I still think I need to go up a size on the prop.
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

Hercdrvr
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Re: Matt's Geronimo

Post by Hercdrvr » Fri Aug 24, 2018 5:18 pm

Good performance on hull #001, adding 2 inches to your pitch will put you over 40 mph and probably running about 5500 rpm. That’ll be a good fit. I’d keep your current prop handy though, it might be the one when you’re loaded with a 1000 lbs of beer and buddies.
Your boat looks very light weight with the uncluttered interior. Glad to hear she’s running flat and true. Well done shipwright.
Matt B

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hoodman
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Re: Matt's Geronimo

Post by hoodman » Fri Aug 24, 2018 5:36 pm

Thanks, Matt! It's uncluttered but we need cupholders ASAP!
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

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mrintense
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Re: Matt's Geronimo

Post by mrintense » Sat Aug 25, 2018 8:50 am

Thanks for posting the performance updates Matt. I've been curious how these hulls perform.
Carl
a.k.a. Clipper

Crafting a classically styled Vera Cruise named "Some Other Time"

Clipper's Vera Cruise Build

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CaptDave
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Re: Matt's Geronimo

Post by CaptDave » Sat Aug 25, 2018 6:56 pm

Awesome performance. I am looking forward to a ride in September.
Capt. Dave
Builder of the Amp Eater Aquatron

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hoodman
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Re: Matt's Geronimo

Post by hoodman » Sat Aug 25, 2018 7:48 pm

Dave, I'm looking forward to a ride in Aquatron as well!
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

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CaptDave
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Re: Matt's Geronimo

Post by CaptDave » Sun Aug 26, 2018 7:23 pm

You got it --
P.S. you wont have to wear your hat backwards in Aquatron
Capt. Dave
Builder of the Amp Eater Aquatron

footer
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Re: Matt's Geronimo

Post by footer » Wed Aug 29, 2018 8:34 am

Nice work Matt;
You really slammed that one out fast and it looks great. Glad to hear it handles well. Congrats.

eckie63
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Re: Matt's Geronimo

Post by eckie63 » Wed Aug 29, 2018 9:31 am

Matt,

That is one beautiful boat you've put together. Very nicely done. And it sounds like that engine is perfectly size for it as well.
Your chairs really turned out neat. A bit different from the usual padded seats and they go nicely with the style of the boat.

Well done indeed!

-Peter
My previous project: Popular Mechanics PM38 from 1962 (Not a Glen-L design though)
A neat method for steam bending in place.
Using Tractor paint for your boat. Great for trailered boats.

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hoodman
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Re: Matt's Geronimo

Post by hoodman » Wed Aug 29, 2018 10:08 am

Thanks, fellas!

Well, it turns out that I actually had a 15 pitch prop on the boat. I thought it was a 17 so I had the dealer order a 19. Anyways, I'm going to try it out. Easily turning 6000 rpm with the 15. If the rule of thumb is 200 rpm per inch of pitch that should put me at 5200 or maybe a bit more with the 19. If it's too drastic of a change I'll go with the 17.
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

PeterG
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Re: Matt's Geronimo

Post by PeterG » Wed Aug 29, 2018 11:33 am

The 19 pitch should work pretty well by the sounds of it. You'll probably notice a slightly longer time to plane but your cruising speed and engine economy should go up. My 1965 Merc 650 on a 1300 lb. Malahini, the Mercury tables came up with a 17 pitch for a 3 blade prop so your 19 pitch sounds reasonable.
Murphy's Law: Anything that can go wrong, will go wrong.
Griffin's Law: Murphy was an optimist.

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hoodman
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Re: Matt's Geronimo

Post by hoodman » Sat Sep 01, 2018 8:04 am

We had nice smooth water yesterday at the lake with very little traffic. Took mom and dad out. The 19 pitch prop seems to be the winner. With three adults aboard I am hitting the RPM sweet spot at about 5200-5300 RPM WOT. Dad got it up to 40 trimming it way up. Of course, it started porpoising at that point but trimmed down flat it was hitting about 38-39. Still popping up on plane quickly and cruising at 3500 RPM in the mid 20 mph range. I can get up on plane and trim the motor up for efficiency but for hard turns it has to be trimmed down to avoid cavitation. The Geronimo seems to be an awesome boat. It is really roomy in the cockpit. Great family boat.

This all seems pretty much in line with my weight estimates and the "Planing Boat Speed Charts" section on the Glen-L site. http://www.glen-l.com/how-fast/
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

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Bill Edmundson
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Re: Matt's Geronimo

Post by Bill Edmundson » Sat Sep 01, 2018 9:04 am

Thumbs Up :!: Matt

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
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