Quantcast

Thundergull

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

clanon

Well-Known Member
Joined
Jun 6, 2007
Messages
1,101
Regarding Earthstar ; low weight ; clean lines and a laminar perfect(Al) airfoil makes the diference.

Hoerner wing tips will make more lift
 

Attachments

RogFlyer

Member
HBA Supporter
Joined
Jun 27, 2017
Messages
18
Location
Lewisham
A couple of questions regarding Earthstar in California. Airplane is Thunder Gull 2000:

1. Is Earthstar still a going concern? So far, no response to e-mail or phone, but my mate has only been trying for a couple of weeks. The web-site feels pretty current.

2. Peter is 1.87m and 95kg and 71. Roughly 6'2" and 200lbs. Any ideas on cockpit size, pilot weight and electric start?

3. Are the Gull 2000's only kits, or can one get a fully built one?

4. Does anyone know if there are any flying in Australia (or, at a pinch, NZ - though international flight restrictions could be a problem for a while yet).

Cheers,
Michael.
 

Cy V

Well-Known Member
Joined
Jul 1, 2008
Messages
447
Location
Virginia
Earthstar's website still exists, but it hasn't been updated in years. It looks like a website from 20 years ago.
 

Victor Bravo

Well-Known Member
Joined
Jul 30, 2014
Messages
7,866
Location
KWHP, Los Angeles CA, USA
I spoke to Mark Bierle (sp?) a couple of years ago. Nice guy. No idea about the Eartthstar business, but if it is in fact dead then someone needs to continue with that wing design on something other than the Titan
 

Rienk

Well-Known Member
Joined
Oct 11, 2008
Messages
1,366
Location
Santa Maria, CA (SMX)
I've visited Mark a couple times in the last few months.
EarthStar is going strong, though doing electric conversions of existing planes (I don't think they've sold a new plane in years). I believe he just picked up 5-7 Thundergull fuselages back east when he dropped off two electric conversions.
Their Zero electric system conversion is pretty slick - I just bought one for our little plane.
 

RogFlyer

Member
HBA Supporter
Joined
Jun 27, 2017
Messages
18
Location
Lewisham
Ok, thanks. Will give it another go.
A fairly comprehensive search shows none registered/flying in Oz.
 

13brv3

Well-Known Member
HBA Supporter
Joined
Feb 14, 2018
Messages
101
Location
Tellico Plains, TN
Their Zero electric system conversion is pretty slick - I just bought one for our little plane.
I'd be interested to know what he's charging for those if you don't mind saying. I was dead set on getting an electric Thundergull at one point, but I just never pursued it. Rusty
 

Tornado Flyer

Active Member
Joined
May 19, 2015
Messages
43
Location
Beech Bluff, TN USA
A couple of questions regarding Earthstar in California. Airplane is Thunder Gull 2000:

1. Is Earthstar still a going concern? So far, no response to e-mail or phone, but my mate has only been trying for a couple of weeks. The web-site feels pretty current.

2. Peter is 1.87m and 95kg and 71. Roughly 6'2" and 200lbs. Any ideas on cockpit size, pilot weight and electric start?

3. Are the Gull 2000's only kits, or can one get a fully built one?

4. Does anyone know if there are any flying in Australia (or, at a pinch, NZ - though international flight restrictions could be a problem for a while yet).

Cheers,
Michael.
I got a reply to a question last month, but I do not think they are producing many planes.
 

RogFlyer

Member
HBA Supporter
Joined
Jun 27, 2017
Messages
18
Location
Lewisham
Clanon

What's so good about the wing - the airfoil section?

I didn't think laminar flow was achievable on ultralight wings - at 2.3M (63mph, 4.75 ft chord) I would think the Reynolds number is too low to avoid turbulent flow. The wing surface would need to be pretty much optically flat and the profile exact. It would appear to be worse at stall, too, with a Re only just over 1M

That said, something doesn't add up if the published stall speed is correct. It would imply a real CLmax of 2+, which seems very high for such a low aspect wing.

What am I missing?
 

Victor Bravo

Well-Known Member
Joined
Jul 30, 2014
Messages
7,866
Location
KWHP, Los Angeles CA, USA
It didn't look like a laminar wing to me when I saw a Gull or Titan parked out at the local UL strip here a year or so ago. It looked like a well designed, clean, well-executed sheet metal wing, which automtically looks a lot more slick than what you are used to seeing on an ultalight. The wing looked more like something Dick VanGrunsven would have done for a UL experiment.
 

b7gwap

Well-Known Member
Joined
Sep 1, 2014
Messages
283
Location
UT
Wasn’t the RV-5 Dick’s foray into ultralights?

I like the thunder gull. I agree their website looks ancient.The airplane seems like it could be a good contender to the established UL types out there, if the price point is similar enough.
 

Retiree

Well-Known Member
Joined
Nov 29, 2010
Messages
91
Location
USA
Clanon

What's so good about the wing - the airfoil section?

I didn't think laminar flow was achievable on ultralight wings - at 2.3M (63mph, 4.75 ft chord) I would think the Reynolds number is too low to avoid turbulent flow.
You have it backwards. It easier to get laminar flow at lower Reynolds numbers.
Doug
 

plncraze

Well-Known Member
HBA Supporter
Joined
May 11, 2006
Messages
1,905
According to the designer of the Thundergull the performance comes from the detail design of the aerodynamics. Apparently the electric one is very quiet due to less turbulence at intersections and no unnecessary items sticking into the wind. This was in Sport Aviation about a year ago.
 

dragon2knight

Well-Known Member
HBA Supporter
Joined
Mar 2, 2015
Messages
169
Location
Bronx, NY
I had a surprise lunch with Mark at Osh 2019, very nice guy. Turns out we had a lot in common and it turned into a meal at a nearby stand, it was one of the best experiences I had there :cool: I saw the electric conversion he's doing and had a seat in it, very roomy and comfy. I'd always been interested in his designs and he's still going strong despite being in a pretty bad accident a few years ago.
 
Top