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Forum members' new models: Let's see them.

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Cliff 195926/07/2020 14:37:54
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537 forum posts
77 photos

An inflight picture of my Ocean Breeze Junior, an own-design by John Woodfield. Have a look in the video section for the video that the screen shot was taken from.

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Erfolg27/07/2020 12:17:15
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11801 forum posts
1346 photos

This is not a new model in the strictest definition of new.

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In that the model was completed in Novemberish, the weather then intervened in delaying the first flight, immediately followed by the Corona Virus and subsequent restrictions.

The first flight took place approx two weeks back. It was most fortuitous that that the grass on the field had been cut, albeit with the cut grass left to be dispersed by the sun to dry it and the wind to finish its removal. My test pilot checked out the model for control surface movements. The model placed in the centre of the field, throttle opened, the model raced across the surface with all the urgency of a racing slug, on Valium. Finally it was eased into the air, swinging left, which was arrested by the pilot. Slowly the model gained height, where a number of checks were made. Firstly response to ailerons, rudder and elevator, secondly stall characteristics. The test pilot then called for a landing, as the power was only just adequate to stay in the air.

We then had a discussion, where it was decided that the model was vastly underpowered, secondly that the CG was probably a little to far forward. I decided that the initial change would be to re-battery from 3s to 4s. I would then move the CG to the mid position (by removing the nose weight) If the power was still inadequate I would re-motor.

A check of the motor on 3s was showing a little over 200w pulled, on a 4s this went up to 360w (approx 1/3rd improvement).

The next good day had us back at the field, a bit blowy. On attempting to arm the model, I discovered I had left the conversion plug at home. At present I am going through my collection of models and converting them from Deans to XT60 plugs, which mainly involves the ESC, in this case the ESC was done, this old, seldom used Lipo was still on Deans.

This week-end was yet another good day. Back at the field the model was once more prepared and checked. This time the model raced across the field like racing Pony, on its 360w. My pilot did say, you know with a horse up front or 760w it would be a real monster. Who remembers those lectures with respect to James Watt his horse and deciding that a horse power would be 33,000 ft lb per minute? The good news is now the model takes of with authority, no tendency to swing left being on the stall. The roll rate is adequate, inverted flight good, loops good, spins reluctantly entered in both directions, stall turns fine.

So + 6 months down the line the model is OK. Just about ready for me.

Edited By Erfolg on 27/07/2020 12:20:17

EarlyBird30/07/2020 16:35:05
355 forum posts
273 photos

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Cheers beer

Steve

Graham Davies 302/08/2020 11:01:16
99 forum posts
45 photos

Slightly previous here as it's not quite ready for maiden today, but this is my refurbed Wot's Wot. It's been in the loft of may last 3 houses, so hasn't flown for 25 years. Last flew on an ASP61, now has a nice SC91FS up front. Covered with the Richard Wills approved brown paper method, and sprayed with discontinued Halfords car paints at just £3 a can. It's going to get a bit more trim before it flies, but should be up in the air again next weekend. I think it looks OK..

Graham

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Martin McIntosh02/08/2020 11:17:23
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3542 forum posts
1220 photos

Very nice, no problems seeing that then.

Graham Davies 302/08/2020 11:41:13
99 forum posts
45 photos

Thanks Martin, my last refurb was an Acrowot and I used up some blue solartex. I now know that light blue/ dark blue models become just a pair of wheels in the air! I'm not going to lie, this scheme was definitely inspired by the invisible Acrowot!

John Laird02/08/2020 15:34:42
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442 forum posts
57 photos

 

 

mercury marauder still.jpgmerury marauder (3).jpg

Here is my scaled up version of H J Nicholls 1952 glider design, the Mercury Marauder. That's a metre stick shown for scale

Span is 88" and power a 200W brushless motor. More details are on my summary build log on RcGroups vintage forum here

**LINK**

and the you tube video of it flying here

**LINK**

Edited By John Laird on 02/08/2020 15:41:43

PeterF02/08/2020 16:49:06
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569 forum posts
740 photos

John,

I have not seen anything like your Maruader flying before only having flown for the last 2 decades. What a lovely flight, I came on to add my latest model below and got diverted looking at yours.

PeterF02/08/2020 16:58:00
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569 forum posts
740 photos

I took this glider up to the field today for the maiden flight. 3.6m wingspan "Element" glider by TopModel CZ. Weather was not really up to checking out its thermaling capability, just flew some gentle launches, a couple of full power motor runs and landings getting the mixes set up for launching and crow braking for spot landings. Flew very well, the sink rate was good and it could fly very slowly with a few mm of down flap. Runs on a 3S 3350mAh battery through a Turnigy Glider Drive 3858 4.6 840kV motor and YEP 80A ESC, 14x10 carbon prop pulling just under 600W. Total weight 2.1kg = 4lb 10oz. No one with a decent camera at the field for some in flight shots.

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Edited By PeterF on 02/08/2020 16:58:21

Steve Colman02/08/2020 17:07:12
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798 forum posts
483 photos

Really like the Element Peter. I have a the smaller Marabu awaiting completion.

Trevor Crook02/08/2020 17:17:36
1003 forum posts
71 photos

Just posted these on another thread, taken at the field this morning at its third flying session. Foamy ARTF obviously, it's the FMS 1400mm Bf109F, flies nicely on 4S. It is beyond my modest modelling skills and patience to create such a thing, I stick to building simpler designs, but I did enjoy applying weathering and replacing the rather small pilot with one to the correct scale. Now I look at the photos, I must do something to improve the wheel hubs!

109f rear.jpg

109f front.jpg

Torsten Spitzner10/08/2020 20:57:04
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67 forum posts
86 photos
Posted by Torsten Spitzner on 09/02/2020 11:27:24:

Here's my latest model. He is yet to maiden, just waiting for less windy days since I made a simple (well, not that simple to make..), round parachute.

20200203_122937.jpg20200203_122759.jpg20200207_124818.jpg

The little man has finally maidened. He has 5 skydives logged and I am quite pleased with the 'model'

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Peter Miller11/08/2020 08:12:27
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11363 forum posts
1342 photos
10 articles

Very impressive

Graham Davies 311/08/2020 08:31:30
99 forum posts
45 photos

Torsten, that looks great!

Can you tell us a bit more? It looks fully controlled, can you control the dive as well as the parachute descent?

Don't tell me he steers the car too; I'm not buying that as he can't see over the dashboard. You have to get up early to catch me with me trousers...

As Peter says, that's really impressive.

Graham

Peter Miller11/08/2020 08:48:25
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11363 forum posts
1342 photos
10 articles

Our club secretary had one of the Robbe ones many years ago. He may still have it.

It worked very well.

Caveman11/08/2020 13:15:11
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310 forum posts
244 photos

The parachutist plan and article are freely available on Outerzone here parachutist

I have to say I'm quite taken by this and am considering having a go, but first I've got work out how to get him aloft as I don't fancy building yet another plane purely for parachute dropping.

Perhaps a scaled down version may be easier to accommodate?

GDB

Paul Marsh13/08/2020 17:15:44
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4090 forum posts
1233 photos

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Keith Evans 321/08/2020 13:44:14
404 forum posts
157 photos

Hi this is my latest lockdown project --- A Cessna Skymaster .

I used Simon Delaney's plan of May 1993 as a basis .

I've modified it a bit .

The cabin is now fully glazed .

It now has working rudders and flaps . The elevators and rudders are driven by snakes in the booms .

The ailerons and flaps have their own mini servos in the wings .

The wing struts are non load bearing and are plastic loose leaf binder clips pushed over small ali . brackets on the fus .and wing .

The under carriage is a bit too long as I am concerned about prop clearance on take off . It's currently sporting a10"prop .I could go for a 9" three blader as previously suggested but I'll try this out untiI get a feel for things.

It is powered by a Thunder tiger Pro 40 and uses an in cowl silencer .

I'm waiting for some decent weather to see how it performs . To balance the plane about 3 grammes of lead was necessary at the end of the booms giving a high wing loading of about 29oz.. per sq.foot .

Oh well we shall see ! ! !

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Vecchio Austriaco21/08/2020 13:52:10
avatar
1515 forum posts
728 photos
Posted by Erfolg on 27/07/2020 12:17:15:

This is not a new model in the strictest definition of new.

wp_20191121_15_53_16_pro.jpg

In that the model was completed in Novemberish, the weather then intervened in delaying the first flight, immediately followed by the Corona Virus and subsequent restrictions.

The first flight took place approx two weeks back. It was most fortuitous that that the grass on the field had been cut, albeit with the cut grass left to be dispersed by the sun to dry it and the wind to finish its removal. My test pilot checked out the model for control surface movements. The model placed in the centre of the field, throttle opened, the model raced across the surface with all the urgency of a racing slug, on Valium. Finally it was eased into the air, swinging left, which was arrested by the pilot. Slowly the model gained height, where a number of checks were made. Firstly response to ailerons, rudder and elevator, secondly stall characteristics. The test pilot then called for a landing, as the power was only just adequate to stay in the air.

We then had a discussion, where it was decided that the model was vastly underpowered, secondly that the CG was probably a little to far forward. I decided that the initial change would be to re-battery from 3s to 4s. I would then move the CG to the mid position (by removing the nose weight) If the power was still inadequate I would re-motor.

A check of the motor on 3s was showing a little over 200w pulled, on a 4s this went up to 360w (approx 1/3rd improvement).

The next good day had us back at the field, a bit blowy. On attempting to arm the model, I discovered I had left the conversion plug at home. At present I am going through my collection of models and converting them from Deans to XT60 plugs, which mainly involves the ESC, in this case the ESC was done, this old, seldom used Lipo was still on Deans.

This week-end was yet another good day. Back at the field the model was once more prepared and checked. This time the model raced across the field like racing Pony, on its 360w. My pilot did say, you know with a horse up front or 760w it would be a real monster. Who remembers those lectures with respect to James Watt his horse and deciding that a horse power would be 33,000 ft lb per minute? The good news is now the model takes of with authority, no tendency to swing left being on the stall. The roll rate is adequate, inverted flight good, loops good, spins reluctantly entered in both directions, stall turns fine.

So + 6 months down the line the model is OK. Just about ready for me.

Edited By Erfolg on 27/07/2020 12:20:17

Carl, what is that? looks a little bit like the Webbit (which I destroyed a few years ago) If so than it has a wingspan of approx 110cm. Mine was totally overpowered, could fly vertical.

BR Vecchio

ron evans21/08/2020 16:11:25
avatar
457 forum posts
26 photos

Very nice Keith...and good luck with the maiden....I'll try not to miss it. yes

Ron

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