Dimpled Dumpling -Building Hints Wanted

Active member

Hello All, I'm about to start building a Dimpled Dumpling. Has any one got any advice or tips etc. Any drawing errors on plan? Any pictures of models would be appreciated.
Thanks David

Obsessive Poster

G'day David,

Here's a D.D. example from the down under Nats last April.

The Hugh Simons / Grant Potter racer holds the Oz heat and final record of 3.11 and 6.34 respectively. It also won the last Nats.

Best building hint is to keep it LIGHT!

Obsessive Poster

While we're in a posting mode, here's the other D.D. by Hallowell/Baddock (blue wing tips) that placed second at the Nats just 4.5 seconds behind. Both models are powered by the amazing R250 Oliver Tiger replica that's made in Australia by Steve Rothwell.

The H/B Dimpled Dumpling did 18.8 seconds for 10 laps on its first flight on 46'.8" lines. It's a very quick little model which flys quite well off the Aussie grass.

Moderator

G'day John

I knew you couldnt resist, nice models as ever, just one point that I would add, whilst it is good to keep light, David, if you are going to fly in the UK, remember that other than Bristol we fly off hard surface and the light Aussie models do not last long, they are just built to light, I speak from experience

Sad

Personally I think the Dumpling is as ugly as a hatful of whatevers, But Toogood Ward and the Heywards swear by them, good luck.

DB

Gold member

Duncan's right, we do swear by them, Dad can build em spot on now. My advise as a pilot would be to make the back end strong. I have a nack of splitting them, maybe it's my bad piloting skills eh Dunc????

Make sure your undercarriage is forward but not too low, don't worry too much about weight, build something that will last races, get a stiff mounted motor, and a good strong wood for the wing. (Can you tell I'm a pilot who doesn't build???)

I'll get some pics of the one Dads just finished when the light is better tomorrow, maybe it will help.

Obsessive Poster

G'day Duncan!

Seems just like yesterday you were back on Aussie grass! You're right when you say Dimpled Dumplings must be strong. I planked the rear for extra strength when the plan shows a carved block. And let's not forget our Oz rules allow these Vintage A racers to be covered in light weight fibre glass cloth, which greatly adds to the strength and durability of a racer. A sensible concession to practicality!

This little racer has grown on me considerably, a fact no doubt influenced by the 106 mph on its first flight! I now think the design is a work of art...

One more thing... on the bottom right hand corner of the D. D. plan there is a subtle reminder to the builder that says:

Don't forget the 3 rules for making successful models.
1. Build it light
2. Don't build it heavy
3. Cut down on the weight wherever you can.

Gold member

As promised

Gold member

Bottom

Gold member

Front duct

Gold member

Active member

Thanks for all this info, will be cutting balsa tomorrow. This is the forum at it's Best. Now who's got a cheap Rothwell they can let me have Wink

David

Site Admin

Please try to limit photographs to 600 pixels width as it means we have no horizontal scroll bar unless a user is still on 800x600 res.
Also saves me having to resize them. Wink

Jim

Silver member

Hi Noz

Nice model! Can you tell me how much she weighs all up and also are you bolting the engine directly down on the bearers, or on ali pads.

Thanks

Adrian

Gold member

I can't take any credit for this model, It's all my dads hard work. To mount the engine he goes direct onto the top of the crutch which runs full length of the model, he then bolts thro' to a steel block on the underside of the bearer. So if he is a little heavy handed they can be replaced.

The model is 400g, He hasn't had one below this yet.

Sorry about the piccy sizes, I'm sure I read to make the size 800x600 but must be wrong.

As for a rothwell, I'm sure they are very quick motors, but get your CS and a dremel and you can be as fast!!!

Silver member

Thanks Noz - useful info

PS No need for a Dremel - I have a Rothwell

Thanks for replying so quickly

adrian