'ello Dolly

[leccyflyer]

Posted by leccyflyer on 25/10/2010 22:41:11:

Posted by Steve Hargreaves on 25/10/2010 16:12:03:

Just adding a post so I can be involved.....I prefer the idea of a dolly to a bungee too....

 

How big is the Spit Chris...? Just to get an idea of scale. The dolly looks a good option for both EDF & say, a Cambria FunFighter sized model (42" span)....

 

I don't know about you guys but I've found that most handlaunchers leave a lot to be desired.....the number of models I've seen trashed after a dodgy throw....well lets just say its quite a few!!!

 Hi Steve

 

The dolly was originally designed for the Cambrian Spitfire funfighter and has been used to lauch a variety of funfighter models including that Spitfire, the Cambrian Bf109E funfighter, Balsacraft Bearcat and FW190,  Ripmax Spitfire, Westfield F-86 Sabre, Zagi E400, and borrowed for a few clubmates similar models.

 

Here's that Cambrian Spitfire on the dolly

 

 

It's pretty near perfect for that size of model and came about after handlaunch woes and a very unsuccessful try of a catapult!

 

[Phil Claridge]

has any one tried a bugeed dolly?

[Tim Mackey]

Uhhh?

[Tim Mackey]

Posted by leccyflyer on 25/10/2010 22:43:52:

Posted by leccyflyer on 25/10/2010 22:41:11:

Posted by Steve Hargreaves on 25/10/2010 16:12:03:

Just adding a post so I can be involved.....I prefer the idea of a dolly to a bungee too....

 

How big is the Spit Chris...? Just to get an idea of scale. The dolly looks a good option for both EDF & say, a Cambria FunFighter sized model (42" span)....

 

I don't know about you guys but I've found that most handlaunchers leave a lot to be desired.....the number of models I've seen trashed after a dodgy throw....well lets just say its quite a few!!!

 Hi Steve

 

The dolly was originally designed for the Cambrian Spitfire funfighter and has been used to lauch a variety of funfighter models including that Spitfire, the Cambrian Bf109E funfighter, Balsacraft Bearcat and FW190,  Ripmax Spitfire, Westfield F-86 Sabre, Zagi E400, and borrowed for a few clubmates similar models.

 

Here's that Cambrian Spitfire on the dolly

 

 

It's pretty near perfect for that size of model and came about after handlaunch woes and a very unsuccessful try of a catapult!

 

 Tried unsuccessfully today to purchase the fittings for this - where on earth did you get the pipe fittings ?

They do look suspiciously like gazebo roof fittings - but they are way to heavy and large.

[Phil Claridge]

like a shorter glider towline attatched to the dolly tim to give a bit more take off speed

[Tim Mackey]

Nope, still dont get it

Why would that be called a bugeed dolly??

[Pete B]

I think Phil means a bungee'd dolly. Attach a length of bungee cord or surgical tubing to the dolly, not the model.

 

Blimey.............................what if the dolly yo-yo'd back to you after launch?

Pete

[leccyflyer]

Posted by Tim Mackey - Administrator on 26/10/2010 17:57:38:

Posted by leccyflyer on 25/10/2010 22:43:52:

Posted by leccyflyer on 25/10/2010 22:41:11:

Posted by Steve Hargreaves on 25/10/2010 16:12:03:

Just adding a post so I can be involved.....I prefer the idea of a dolly to a bungee too....

 

How big is the Spit Chris...? Just to get an idea of scale. The dolly looks a good option for both EDF & say, a Cambria FunFighter sized model (42" span)....

 

I don't know about you guys but I've found that most handlaunchers leave a lot to be desired.....the number of models I've seen trashed after a dodgy throw....well lets just say its quite a few!!!

 Hi Steve

 

The dolly was originally designed for the Cambrian Spitfire funfighter and has been used to lauch a variety of funfighter models including that Spitfire, the Cambrian Bf109E funfighter, Balsacraft Bearcat and FW190,  Ripmax Spitfire, Westfield F-86 Sabre, Zagi E400, and borrowed for a few clubmates similar models.

 

Here's that Cambrian Spitfire on the dolly

 

 

It's pretty near perfect for that size of model and came about after handlaunch woes and a very unsuccessful try of a catapult!

 

 Tried unsuccessfully today to purchase the fittings for this - where on earth did you get the pipe fittings ?

They do look suspiciously like gazebo roof fittings - but they are way to heavy and large.

They are the remnants of a child's Wendy house frame. If you take a look in my gallery you can see the details of the angled corner pieces and the right angle piece used for the tail end.  They aren't heavy or large - the pipe is plastic -12mm OD and the entire thing weighs 7 ounces.

Edited By leccyflyer on 26/10/2010 23:48:06

[Tim Mackey]

Doh!  No wonder I cant find the pieces in the DIY sheds .

Well unless anyone has a childs wendy house that got seriously damaged in the storms....I'm snookered for that idea then .

[leccyflyer]

Get thee down to the charity shop, or a car boot sale, or even do a bit of skip-diving. It's half term. Children will be put to the task of cleaning up their bedrooms ready to fill them with new rubbish in a couple of months time. I bet that your local waste recycling centre has at least one discarded Wendy house just sitting there in bits

[Mowerman]

If you take anything from our local re-cycling centre you are threatened with being charged with theft

Only 'licensed' scavengers allowed.

[Tim Mackey]

Yep, same here - they even have CCTV now covering the whole depot.

I know of one case where a guy was taken to court and successfully prosecuted for taking a discarded broken bicycle frame. However, the employees have their own van on site, and one of them seems to spend all his time sifting, and then filling said van.

Outrageous really .

However...off topic - Ill check the other sources mentioned. TY

[Chris Bott - Moderator]

Tim I guess you'd need something like this.. wendy house  I bet the returns people get plenty of broken ones back?

[Tim Mackey]

Bizarrely Chris, I actually emailed these very same people earlier today after spotting their ad on ebay

I asked about returns /faulty stuff and if they knew the frame type ,size etc, and their reply was

 

" Sorry no I don't - the frame is made up of white plastic tubes about 1/4" in diameter Regards - mighty_oak_trading"

Seems way  too small to me

[Klippy]

Tim, have you thought about HDPE pipe? It comes in 12mm diameter and is fairly rigid in lengths up to 600mm. You can also buy push in fittings for it, T's angles etc. It's used out here for garden irrigation.

[Tim Mackey]

I did buy some push fit plastic pipe for overflows etc from our DIY shed...but couldnt find the angled fittings I wanted. I have literally just tried a test piece to see if it will stick to correx board with plumbers solvent weld glue, in which case I may see what I can knock up with it,

[leccyflyer]

I;ve seem some much heftier dolly systems built from that sort of pipe - a chap on the ezone uses one, with a steerable servo driven wheel, made from PVC pipe for hs Kyosho T-33.

 

That is much heavier and substantial than the small lighweight dolly that I showed.

 

Here's a link.

 

Edited By Tim Mackey - Administrator on 27/10/2010 18:41:06

[Tim Mackey]

Thanks Brian ( I edited your post so as to insert the link correctly )

[leccyflyer]

Thanks - I keep forgetting that's how it works here 

[Steve Hargreaves - Moderator]

I assumind it was the 20mm electrical conduit that had been used to make the frame..... Lots of right angle/cross pieces for this stuff....

 

Thinking about it I suppose it might be a bit heavy!!!

[Tim Mackey]

Made a start on this project now, and am just trying to decide which wheel/axle method is best before proceeding further

 The criteria is as follows

1) It will be trike with single wheel at rear - Morgan style

2) Model has no rudder and I dont want the complication of dolly steering

3) Mown grass strip -  expect model to be airborne within 40 - 50 yards maximum

So, should the tailwheel be castoring or fixed,

....and more importantly the front wheels....

Fixed stub axles - each wheel independant - or rigid axle connecting both wheels ?

Castor Y/N , Camber +/- or none, Toe in.... or out?

[leccyflyer]

Posted by Tim Mackey - Administrator on 19/11/2010 15:03:00:

Made a start on this project now, and am just trying to decide which wheel/axle method is best before proceeding further

 The criteria is as follows

1) It will be trike with single wheel at rear - Morgan style

2) Model has no rudder and I dont want the complication of dolly steering

3) Mown grass strip -  expect model to be airborne within 40 - 50 yards maximum

So, should the tailwheel be castoring or fixed,

....and more importantly the front wheels....

Fixed stub axles - each wheel independant - or rigid axle connecting both wheels ?

Castor Y/N , Camber +/- or none, Toe in.... or out?

 Fixed stub axles would be less draggy if the grass is long enough than a rigid axle connecting them. There is no toe-out or toe-in on my dolly.

 

The tailwheel is best able to be fixed in any position, to handle models with or without rudder, I wouldn't see any real advantage in having it free-castoring. If you don't have a rudder then it would definitely need to be fixed and manually adjustable.

 

For EDF you might also consider adding a hook, such that. if necessary, you can add bungee assistance.

[Tim Mackey]

OK cheers for that.

[Klippy]

Hi Tim, kiss I think, a single straight axle across the front, with the 2 wheels held by collets. 0 camber or toe in, but I would give it some castor by raking the front struts back at about 20degrees.

[Tim Mackey]

I was wondering about the axle in particular as its suggested that fixing each wheel to its partner should improve straightline performance - allowing for leccyflyers point about ground clearance. I plan on using fairly large wheels so doubt this will matter too much.

Cheers Tony.