Go Back  RCU Forums > RC Airplanes > Extreme Speed Prop Planes
Reload this Page >

Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Reply

Old 04-10-2006, 09:04 PM
  #1  
cobratraxxas69
Senior Member
Thread Starter
My Feedback: (31)
 
cobratraxxas69's Avatar
 
Join Date: Dec 2003
Location: Fullerton, CA
Posts: 434
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Hi guys,

I finally built a dolly that gives consisently awesome launches with my Clipped Wing Diamond Dust (will launch with 20-30 foot take-off roll everytime).

Parts:

1 Piece of 1/4" by 12" by 24" Poplar Plywood Micro-Lite (Birch is too heavy, Balsa is too weak) (from Hobby People)
4 Extra-light wheels (2-1/4 inch Diameter) (Part # HLFK1612) ( http://www.hobby-lobby.com/wheels.htm )-- these have to be drilled out a little to spin-freely on the axle (the axle is 4mm in diameter)
2 sets of 16" Inexpensive Wire Main Landing Gear (Part # RA1094) ( http://www.hobby-lobby.com/landinggear.htm )
8 Nylon Landing gear straps (5/32 inch) ( http://www.hobbypeople.net/gallery/567545.asp ) (Use 4 for each landing gear--they come with mounting screws)
8 Wheel collars (3/16 inch) (Hobby People) (I used 2 per wheel-- one spinning free on the inside and one locked on the outside--use Loc-Tite)-- do NOT use 5/32 inch wheel collars, they won't fit on the axles, I know this from experience!!

1 Dubro 4-40 Threaded Coupler (to go into the rear of the Dust-- between the ailerons) -- Super glue it in!
http://www.hobbypeople.net/gallery/866286.asp

1 U-shaped nail -- Hammer and Super glue it in! (Placed on longitudinal centerline, 1.25 inches from rear of plywood)--The threaded coupler from the rear of airplane goes in here
One 3/4 inch nail --Hammer and Super glue it in! (Placed on longitudinal centerline, 13 7/8 inches from rear of plywood)-- this position can vary, but near the part of the dust that lies flush with the plywood behind the fuel tank. This nail will go into the bottom of the plane.



Each landing gear had 2 wires. I placed the main wire (the one with the axle) on the inside for both the front and rear landing gear.

For the front landing gear, I placed the inner wire (closest to the center) 3 inches from the front of the plywood.

For the rear landing gear, I placed the inner wire (closest to the center) 3.5 inches from the rear of the plywood.

The 3 main things I discovered while trying out various launch dollys was:

1) Keep them light!! (Don't go heavy-duty, or the plane won't build up enough speed to take-off)
2) Make sure the wheels can spin freely and that the dolly goes somewhat straight.
3) Make sure the lite-plywood is wide enough to keep the plane from torquing off the dolly to the left. The torque of the engine will twist the plane off of a too-narrow dolly.

Attached Thumbnails Click image for larger version

Name:	Mk25020.jpg
Views:	75
Size:	32.7 KB
ID:	443028   Click image for larger version

Name:	Xt60201.jpg
Views:	65
Size:	35.0 KB
ID:	443029   Click image for larger version

Name:	Ns43465.jpg
Views:	51
Size:	51.0 KB
ID:	443030   Click image for larger version

Name:	Cv62460.jpg
Views:	66
Size:	58.2 KB
ID:	443031  
cobratraxxas69 is offline  
Reply With Quote
Old 04-11-2006, 01:42 PM
  #2  
Smooth Spanky
 
Smooth Spanky's Avatar
 
Join Date: Sep 2003
Location: Shelby Township, MI
Posts: 155
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Now this is a good idea!

Cobra, I'm clear on everything except for what the nails are used for and how the plane is temporary held to this thing. Any other info (pics???) would be appreciated.

Thanks!

SS
Smooth Spanky is offline  
Reply With Quote
Old 04-11-2006, 03:58 PM
  #3  
cobratraxxas69
Senior Member
Thread Starter
My Feedback: (31)
 
cobratraxxas69's Avatar
 
Join Date: Dec 2003
Location: Fullerton, CA
Posts: 434
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Hi,

The plane is held to the dolly by 2 nails. #1) a U-nail (technically a 3/4 inch staple) is hammered into the plywood at the back of the dolly and #2) a regular nail (3/4 inch long) is hammered into roughly the center of the dolly (so that the pointy end comes up through the dolly which will penetrate into the covering of the bottom of the plane). Test fit the plane into the dolly first to decide where the regular nail should be placed, it should penetrate aft of the fuel tank.

A threaded coupler (basically a rod with threads on half of its length) is super-glued into the rear of the Dust and it slips into the U-nail at the back of the dolly to secure the rear of the plane. The center of the plane is then pushed onto the regular nail at the center of the dolly, so that a hole is made in the covering. I superglued thin K&S Engineering Plastic Sheet ( http://www.hobbypeople.net/guru/hps_475421846.asp ) onto the bottom of the plane (over the covering) to protect it and keep the hole from growing in the covering.



Here's some more pics to describe what I mean:
Attached Thumbnails Click image for larger version

Name:	Mk25005.jpg
Views:	91
Size:	48.9 KB
ID:	443551   Click image for larger version

Name:	Rn39370.jpg
Views:	46
Size:	30.8 KB
ID:	443552   Click image for larger version

Name:	Di10326.jpg
Views:	31
Size:	82.8 KB
ID:	443553   Click image for larger version

Name:	Rk23149.jpg
Views:	41
Size:	30.2 KB
ID:	443554  
cobratraxxas69 is offline  
Reply With Quote
Old 04-11-2006, 07:00 PM
  #4  
Mike Connor
Senior Member
My Feedback: (5)
 
Mike Connor's Avatar
 
Join Date: Jan 2002
Location: Tulsa, OK
Posts: 2,025
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

I must say that is one rough looking Dust.

Why not use two small pieces of velcro that just pull apart rather then the nails.
Mike Connor is offline  
Reply With Quote
Old 04-11-2006, 08:23 PM
  #5  
cobratraxxas69
Senior Member
Thread Starter
My Feedback: (31)
 
cobratraxxas69's Avatar
 
Join Date: Dec 2003
Location: Fullerton, CA
Posts: 434
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

I must say that is one rough looking Dust.

Hehehehe....I prefer "battle-hardened". The interesting thing is that it flies perfectly normal. But I'm sure that no one else has a rougher looking plane

I think the velcro is a very interesting idea, but I'm wondering if it could hold up (without letting go) to the significant thrust of the mighty engines we put on the front of our Dusts.

I'm also wondering if this dolly will work with my Weston Magnum[sm=rolleyes.gif]
cobratraxxas69 is offline  
Reply With Quote
Old 04-11-2006, 09:24 PM
  #6  
vicman
My Feedback: (10)
 
vicman's Avatar
 
Join Date: Dec 2002
Location: Valdese, NC
Posts: 9,910
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

I must say that is one rough looking Dust.
Dang straight! There is some nasty pooo coming outa that Czec motor! I like the dolly tho and am thinkin pretty hard about doing one.

So it lifts off the pointy nail and escapes the U nail right?
vicman is offline  
Reply With Quote
Old 04-11-2006, 10:12 PM
  #7  
cobratraxxas69
Senior Member
Thread Starter
My Feedback: (31)
 
cobratraxxas69's Avatar
 
Join Date: Dec 2003
Location: Fullerton, CA
Posts: 434
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

So it lifts off the pointy nail and escapes the U nail right?
Yep, and it does it without drama!
cobratraxxas69 is offline  
Reply With Quote
Old 04-12-2006, 12:01 PM
  #8  
bob27s
My Feedback: (19)
 
bob27s's Avatar
 
Join Date: Apr 2002
Location: Cleveland, OH
Posts: 5,576
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Very slick...... looks like a nice setup
bob27s is offline  
Reply With Quote
Old 04-13-2006, 12:35 AM
  #9  
SPEED JUNKIE
Senior Member
My Feedback: (14)
 
SPEED JUNKIE's Avatar
 
Join Date: May 2005
Location: GRIFTON, NC
Posts: 488
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Mike,
Glad to see you haven't given up trying to huck the Dust![sm=lol.gif]
I like the old massive monster truck tire version better myself![X(]
It was always trying to make a continuos left hand turn on take off! That made for some very enteresting, no frightning, no painfull aborting proceedures!
Hope all is well and let's go fly together real soon![8D]
Wayne
Rev Bro #118
SPEED JUNKIE is offline  
Reply With Quote
Old 04-13-2006, 02:12 AM
  #10  
cobratraxxas69
Senior Member
Thread Starter
My Feedback: (31)
 
cobratraxxas69's Avatar
 
Join Date: Dec 2003
Location: Fullerton, CA
Posts: 434
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Hey Wayne,

It's good to hear from you. It's funny but 2 of the last 3 times I've been to Rabbit, it has been WAY too windy to fly (the one good day, I had brought a rocket instead of planes). Defintely need to check weather.com before going out there anymore (2 hour drive each way )

I realized that the weight of the "monster truck" version of the dolly was killing me, the poor Dust just could not build up enough speed (plus it was too narrow, the plane was always torquing off of it to the left).

My old dolly weighed in at 4 lbs 5.6 ounces, this new one is 1 lb 11 ounces.

It's hard to imagine I even got the Dust to launch off the old dolly, considering that the poor plane had to pull an additional 4+ lbs, but it's amazing what full high-rate up elevator can do [:P]

Here's a picture of the old "monster truck" version of the dolly, maybe I could strap on a Dynajet to it or something
Attached Thumbnails Click image for larger version

Name:	Tr49548.jpg
Views:	107
Size:	48.7 KB
ID:	444415  
cobratraxxas69 is offline  
Reply With Quote
Old 04-14-2006, 09:28 AM
  #11  
buildflycrash
Senior Member
 
buildflycrash's Avatar
 
Join Date: Sep 2003
Location: Gulf Breeze , FL
Posts: 711
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Yea, but can you land on it?
buildflycrash is offline  
Reply With Quote
Old 04-14-2006, 12:14 PM
  #12  
Ed_Moorman
My Feedback: (1)
 
Ed_Moorman's Avatar
 
Join Date: Jan 2002
Location: Shalimar, FL
Posts: 4,059
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Hey Scott. I launch mine off the table. Let the rear legs down. Use a little PVC rack. It flies right off. Lands on the grass.
Attached Thumbnails Click image for larger version

Name:	Yw66844.jpg
Views:	69
Size:	64.0 KB
ID:	445185  
Ed_Moorman is offline  
Reply With Quote
Old 05-04-2006, 01:51 PM
  #13  
cobratraxxas69
Senior Member
Thread Starter
My Feedback: (31)
 
cobratraxxas69's Avatar
 
Join Date: Dec 2003
Location: Fullerton, CA
Posts: 434
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Great and easy-to-make LAUNCH DOLLY for the Diamond Dust!!

Hi,

I used my dolly to launch my Weston Magnum with West .50 yesterday. It worked great!! But I did make a few observations:

1) It would launch off the dolly EASILY with a 9x7 APC prop. But my 2 runs with a 8x8 APC ended up with a full speed run (dolly and plane together) into the grass (no damage though ). It would not come off the dolly even with full up elevator. I'm sure that there is no way it would launch with a 8x9 or an 8x10 (as these are hairy to just hand launch).

2) The 3/4 inch nail near the center of the dolly was enough to keep the plane on the dolly. I didn't use the threaded coupler with the Magnum as the plane is too long. I just rested the fuselage of the plane on the U-nail in the back. Note: After 4 launches the U-nail had dug a little tunnel in the rear fuselage. But as you tell from my Diamond Dust, my planes all look a little rough Maybe you remove the U-nail before flying with the Magnum.
cobratraxxas69 is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service