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Messages - jondrums

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1
Foil SUP / fairing my gofoil GL210
« on: September 18, 2019, 11:46:39 PM »
I am seriously considering using some kind non-permanent filler to "fair in" and streamline my GL210 in a quest to eradicate drag and maximize glide.  Going too far you say?  Maybe, but I won't know until I try it - maybe I won't be able to tell the difference, or maybe it'll be revolutionary.  If drag is reduced 5% it would be worth it, and I wouldn't be surprised if it did.  On occasion I feel like I can't get the board moving, and I flip the board over to find a tiny strand of grass stuck on it.  I am continually surprised at how much that little bit of drag is noticeable.

Think I'm crazy? Fine, move along and comment elsewhere.  The rest of you - who has advise on exactly what filler product or mix of products I can use for this?

I'd fill in and sand to smooth the following spots:
The main wing screw and countersink gap
The gap between the fuse and the main wing
The gap between the fuse and the tail pedestal
The two phillip heads screws holding on the tail
run a small fillet radius around the connection between the tail and the pedestal

Together I think these improvements will be noticeable.  But I don't want to forever lock the parts together, so it would have to be removable somehow.  Don't care too much how it looks, it'll be underwater most of the time that matters.

2
Foil SUP / Re: GoFoil 1.5 Release
« on: September 18, 2019, 11:33:18 PM »
Ask for TJ at Big Winds in Hood River.  They pick up the phone and you can get it done the old fashioned way by actually talking to someone who knows and wants to make you happy.

3
Foil SUP / Re: Flying with one hand OFF the paddle
« on: September 18, 2019, 11:31:11 PM »
YES!  one hand on the paddle WORKS!

I am immediately more dynamic with my upper body and my balance is much better.  I thought it looked super dumb when I first saw Jeff do it, but now that I've been trying it for the last 6 months, I'm sold.  Still have a habit of using the paddle in the water during tight turns, and I don't really think doing that is helpful.

4
Foil SUP / Re: GoFoil 1.5 Release
« on: September 13, 2019, 03:26:08 PM »
I measured my GL210 and put the data here:
https://docs.google.com/spreadsheets/d/17xbTGEWSVeRhnYb_4vz_Gmby8UnrDys7Q1iB-6rC6F4/edit#gid=0

Unfortunately, nothing for the other two, but there are some photos floating around that would allow you to make some estimates based on the verified measurements I made on the 210.

5
Foil SUP / Re: Riding SHORT Foil SUPs
« on: September 12, 2019, 11:09:47 AM »
I really don't understand why footstraps are helpful!  I have not ever had a problem where my foot slipped from its position, and I've also never felt that I needed to pull upwards or sideways with my foot/feet.   Especially in hard turns, the foot pressure into the board increases dramatically and I don't think the straps would really be doing anything.  I've never used straps, so maybe I'm missing the point.  I could see why getting airborne would require straps, but I'm not trying that yet.

6
Foil SUP / Re: My new foil board SUPsurfmachine
« on: September 12, 2019, 11:04:03 AM »
nice one Dwight!

7
Classifieds / Re: GoFoils, JL striker, Naish x32, KeNalu
« on: September 10, 2019, 10:09:02 PM »
I'd sell the IWA/M200/Mast/Tail for just over half the retail price shipped in the continental US for $1000
Maliko160/Mast/Tail for $600

8
Foil SUP / Re: GoFoil 1.5 Release
« on: September 07, 2019, 10:13:07 AM »
the video makes it look positively glassy compared the conditions I've been seeing.  The other day north coast santa cruz had big long period waves, except with chop the size of typical waves breaking inside the faces.  not exactly perfect foiling...  Still had fun!

9
Foil SUP / Re: GoFoil 1.5 Release
« on: September 06, 2019, 07:47:06 PM »
so awesome!  I've been out several days this week and I haven't see the water that calm all week - when was this?  So, does it pump as well as you hoped? - I share your goal to get  to where I can pump back out at similar power output as biking or running. Not there yet.

10
Foil SUP / Re: GoFoil 1.5 Release
« on: September 05, 2019, 12:12:27 AM »
I finally found something the GL doesn't do well! This morning, the break was littered with torn up little pieces of seaweed and seagrass from the last few days of swell.  Seems like the high aspect foil and thin tail can't handle this disturbance.  Lift was totally spoiled and drag through the roof. Basically unfoilable. IWA has previously been only slightly effected in similar conditions.  Interesting, but probably not relevant to most people/spots.

11
Foil SUP / Re: Go Foil Advise
« on: September 03, 2019, 11:45:40 AM »
yes, that image comes from a pretty good decription of Center of Gravity vs. efficiency here:
https://www.boldmethod.com/learn-to-fly/performance/how-does-cg-affect-aircraft-performance/

notable quote:
"while having an aft CG definitely improves performance, in most light aircraft, the difference in will be a few extra knots of airspeed, and a little better climb rate."

My conclusion from all this discussion is:
we should shift our feet and hips to achieve a center of gravity directly over the front wing center of lift and arrange the tail for a neutral position without lift or downforce in the nominal case.

12
Foil SUP / Re: GoFoil 1.5 Release
« on: September 02, 2019, 09:24:00 PM »
narrow works great for me with the GL210

13
Foil SUP / Re: The future of board design?
« on: September 02, 2019, 09:22:11 PM »
Quote
Tuttle boxes will fall out of favor because the next generation of foil SUPs will be so thick no one can find bolts that will work.

So do you think the foil mounts will be going to tracks systems or inserts?

As long as we're talking about getting the board out of the water, it should be noted that the tuttle option will be the least overall drag.  Every little bit matters when you're trying to get out of the water.  I can tell the difference getting out of the water when I get a strand of sea-grass stuck in that joint and that's gotta be less drag than a dual track mount.

14
Foil SUP / Re: Go Foil Advise
« on: August 31, 2019, 11:13:09 AM »

The most efficient wing is a long thin high aspect, glider wing, that would extend to infinity.  Every wing tip has a drag (vortice) penalty aka NO Tail is better.  Down force is also "Bad!"


Thank you for this!  makes total sense.  This suggests that a perfectly neutral tail (no upforce or downforce) should be the best setup for maximum GLIDE. 

15
Foil SUP / Re: Go Foil Advise
« on: August 30, 2019, 09:58:34 PM »
has anyone experimented with shimming a tail to create uplift?  I guess I'll have to try it one of these days.  Might have to learn the hard way why everyone has designed downforce in the tail.

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