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Old Jan 11, 2012, 03:41 AM
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n-tropic's Avatar
Devon, UK
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New WR holding Gulp

Blown away by Spencer's continuing pushing of the envelope with the K100 and Chris' fantastic D60 achievement but as foam is my particular bag I'm really interested to find out more about Greg Bolton's 238mph 48" Gulp and the build of it. Anybody got any pics or information on it?

Steve
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Old Jan 11, 2012, 09:18 AM
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Have to get Gregg to comment but it appeared to be straight forward but very well built and clean. It appeared to be a classic approach (tape and ultracote) rather than new stuff. I know he has a large ballast tube that takes about 1.5x an Opus ballast. The vert stab was foam with covering too. Can't remember any details about the elevons...?Sure Gregg will fill in the details and correct me where I'm wrong.
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Old Jan 11, 2012, 10:24 AM
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He said he was sending a picture of it for rcspeeds. I'll give him a call. A lot of of it is Greg's piloting skills and how hard he was digging.

It didn't feel heavy.

?
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Old Jan 11, 2012, 12:07 PM
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Im sure Gregg will chime in with more information but this is what I know...

48" Gulp using Steve Drake's DS airfoil (unknown) and double taper plan form.

With the ballast tube loaded he was flying at around 65 oz for the record run.

Wing had laminating film with covering over the top and the fuse was covered with goop.

Hitec HS-85 servos

Paul
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Old Jan 11, 2012, 12:08 PM
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Greg just told me that it only weighed 55oz for that WR flight.

He's gona get some photos and send/post them

Chris
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Old Jan 11, 2012, 03:13 PM
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Thanks for the replies guys. looking forward to seeing some pics and maybe finding out more.

Steve
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Old Jan 11, 2012, 05:50 PM
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Quote:
Originally Posted by daboz View Post
Greg just told me that it only weighed 55oz for that WR flight.

He's gona get some photos and send/post them

Chris
I remember he had covered over the ballast tube opening, and only cut it open after the WR flight.
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Old Jan 11, 2012, 07:12 PM
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Great job Greg!
I'd like to see pics too so I can steal some ideas
The DS Gulps are single taper and the SR's are double taper. Could be a hybrid design?
The MH64 and MH45 were used in the past on Gulps.
55oz is still fairly heavy compared to most 48"ers and probably when you compare the W/L to our 60" JWs.

Stu
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Old Jan 11, 2012, 11:52 PM
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I was lucky enough to get to hang out with some buddies I get to see every now and then and some I don't get to see so often on Sunday and it turns out that flying toy planes with your thumbs is fun...

Gregg was going on and on pretty much the whole morning about how the wing tapered and layers of laminate and the ballast and how he had covered it all with colored monokote so it would look good on film... Honestly we all pretty much tuned him out after the first hour or so. But I must say that the plane was WAY nicer than any other foam plane I have ever seen Gregg show up with, he must have had some free time or something because the plane was clearly built with lot's of love.

Anyway here's a couple of pics from the day of "Gregg and the Gulp", (wow that sounds like a pamplet one might pick up in a school nurses office)...

On a serious note there was a lot of really good flying going on in Norco on Sunday and the guys that went really fast pretty much put on a DS clinic. It was a great day!

Cheers,
Chris
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Old Jan 12, 2012, 03:45 AM
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Interestingo!

I notice that the TE has fixed portions at the centre section and tips. A couple of my fastest foamies have fixed TE at the tip and I wonder if this might provide a significant drag advantage.

I am also wondering if there is an advantage in going smaller than 60" for a fast DS foamy, perhaps because relative stiffness over a smaller span is easier to achieve. Also smaller is potentially a little more robust? I'm wondering what trying something in between 48" & 60" would be like.

Steve
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Old Jan 12, 2012, 08:51 PM
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Quote:
Originally Posted by n-tropic View Post
Interestingo!

I notice that the TE has fixed portions at the centre section and tips. A couple of my fastest foamies have fixed TE at the tip and I wonder if this might provide a significant drag advantage.
Don't know about drag but I believe it helps reduce flutter and elevon flex.
Quote:
I am also wondering if there is an advantage in going smaller than 60" for a fast DS foamy, perhaps because relative stiffness over a smaller span is easier to achieve. Also smaller is potentially a little more robust? I'm wondering what trying something in between 48" & 60" would be like.

Steve
My 60" JW wing didn't seem to flex too much despite having only the stock spar arrangement.
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Old Jan 12, 2012, 09:09 PM
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Are those white control horns? Egad!

Nice build, that thing looks sweet!
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Old Jan 12, 2012, 09:21 PM
Just chillin @ 403 MPH
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Boulder Colorado
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Originally Posted by Aerogance View Post
Are those white control horns? Egad!

Nice build, that thing looks sweet!
Yes and all the linkage is all exposed and draggy
looks like she's got more in her


Nice work Greg


Nick
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Old Jan 12, 2012, 11:39 PM
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new gulp ds 48"

Sorry its taken so long to post. This is a new gulp design by Steve Drake. Yes it is somewhat of a hybrid.....SR with a DS foil. The first flight was 50 oz and went 201. For the 238 run we loaded all the ballast for 65 oz and a Sharpie Smiley face for good luck before handing it over to the launch team! I will share the next build when the new 60" is ready.
Gregg
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Old Jan 13, 2012, 12:07 PM
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Moira
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Quote:
Originally Posted by 1000MPH View Post
My 60" JW wing didn't seem to flex too much despite having only the stock spar arrangement.
But the JW has a really FAT section. Is the new gulp section the same?
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