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S1581 Hawker Nimrod MkI

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Danny Fenton29/06/2020 09:36:59
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9651 forum posts
4460 photos

Hi Eric, I look forward to the inquest. Yes you could easily make the collets look scale, and it would allow easy removal of the wheels, good idea.

Started laying out the electronics, there is plenty of space, but it all gets eaten up if not planned well. I hate this bit and would gladly hand the model to somebody else to do this.

I made an error when attaching the covers to the wheels. I used silicone to attach them, and absent mindedly pulled the covers on with masking tape. The covers felt dry but it had not been 24 hours as advised. Yes you have guessed it the tape left marks in the clear coat. So they will have to be rubbed back a little and another coat of clear. Got to be carful not to go through the red, or I will have to start all over again.

Anyway will try and do some more at lunchtime.

Cheers

Danny

Danny Fenton29/06/2020 19:26:23
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9651 forum posts
4460 photos

Did quite a bit on the radio fit out. Realised quite quickly that with the redesigned front end on my redrawn plan, I was going to be very nose heavy. As the battery location is tight I thought I would remove F1 completely, and make a sloping bulkhead to create a battery box with a bit more room. Who knows if I will be able to get lipos the same size in the future, this change has eased that issue considerably. It has brought the c of g back as well which is good.

I have an emergency rx pack that I will fit behind the cockpit somewhere to get it spot on.

As you can see it ended up fairly neat. The FRSky Neuron 80 ESC is sat on a frame so air can get all around, and though the cowl will be close above it there is a stream of air running directly across the top.

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Cheers

Danny

Danny Fenton29/06/2020 19:44:59
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9651 forum posts
4460 photos

Just weighed everything, 2.06 kg, about 4.5lbs smile d should be a real floater

Cheers

Danny

Gary Clark 129/06/2020 20:15:07
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242 forum posts
131 photos

That's much lighter than I'd expect Danny, especially the litho plate on there as I thought that would have been heavier.

Looking forward to seeing it together with the detailing finished. Great job as always.

Gary

Danny Fenton29/06/2020 21:01:30
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9651 forum posts
4460 photos

Thanks Gary there isn't as much Litho as I had first hoped, but with litho its the glue that adds the weight. I have found a good (cheap) carpet double sided tape and that works well. Although good old thin CA has done this.

It's down to careful balsa selection, and the whole model is done with tissue and dope. Each lower wing panel weighs 80g. people add hardwood spars, and a drop of epoxy here and there, the odd doubler and re-enforcement. Next thing you know its put on a pound. Build to fly not to survive a crash. Sorry on my soap box crook

Really enjoying your build, you are lucky to have found a build buddy, that's rare these days. Scale building is often a solitary road.... I have a Top Flite GS P-47 to build, with the intention of not modifying it, what do you think the chances of that are?

Cheers

Danny

Eric Robson29/06/2020 22:47:13
294 forum posts
52 photos

2.06 kg. makes mine clinically obese. Regarding cooling since fitting the spinner the only air holes are the exhausts. I checked the battery after each flight gradually increasing flight time and at no time did the battery get hot even though the temperature that day was 24 c. The last flight was 10mins with 34% left in the battery.

Looking forward to hearing yours fly. Cheers Eric.

Danny Fenton29/06/2020 22:57:22
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9651 forum posts
4460 photos

That is really good to hear Eric, I have exaggerated the spinner to cowl gap with a washer, with the option of an impeller behind it. But it sounds like it wont be needed. My concentration starts to go after about 7 minutes so I should be okay. I am using 2 5S 2700 in parallel, so a 5400 5S effectively, can't remember the capacity you are using?

I have been known to build light, but not very strong. My indoor models often throw there wings off at even good landings My RC models are a bit more robust but not much

Cheers

Danny

Gary Clark 129/06/2020 23:27:11
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242 forum posts
131 photos

Thanks Danny. It's great having Nick building alongside, first time I've had this!

I always wanted to buy a Top Flite kit and kept putting it off for some reason. Always thought I'd try something else first and seems like I've left it too late now.

I like building a kit every now and then because it's strange that I dont feel like they need to be as scale as a plan built model. Doesn't make any sense but that's how I tend to think for some reason.

Gary

Eric Robson30/06/2020 09:04:09
294 forum posts
52 photos

Hi Danny, I am using a single 5s-5000 20c battery . I have a VQ Hurricane and a 65" span ME 109 which use the same power set up. The Hurricane is the least efficient it weighs 9 1/2 lb. but tends to get flown harder than the Fury. The ME109 is lighter at 8 lb and I get about 8 mins flight

The battery weighs 1lb 4oz.

Cheers Eric.

Danny Fenton02/07/2020 08:29:52
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9651 forum posts
4460 photos

Mine only has a 270kV motor Eric hence the big prop, according to the telemetry set up yesterdat, i am at just under 6k rpm unloaded.

Not much to report on mine, finished the radio programming last night. Have configured some flight modes as I am trying something with the sound card, that is a bit novel, shall we say.

Still waiting for some toggle switches to make a power panel. Might play with an Aldis tube today while I wait.

My Piper Apache has been dug out and is anxiously awaiting being lifted onto the bench......

Cheers

Danny

Eric Robson02/07/2020 10:36:57
294 forum posts
52 photos

Hi Danny, good to her you are getting to grips with technology, I am doomed to be a dinosaurindecision I would have loved to see and hear your Fury but I doubt that will happen this year.

Cheers Eric.

Danny Fenton02/07/2020 10:55:51
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9651 forum posts
4460 photos

Still waiting for postie I will do a video of the first Kestrel start-up, actually probably the second, the first will make me jump right out my skin, 40 W of audio in a small workshop is enough to sharpen your senses!

But seeing it, you might be right. I am not sure what is happening about the RCM&E fly-in at Buckminster this year, need to check with David.

Cheers

Danny

Danny Fenton02/07/2020 22:13:50
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9651 forum posts
4460 photos

Well the switches eventually arrived and some time was spent creating a wiring harness to couple the two packs, and to provide a 21V feed to the Amp. I also configured one of Chris Botts magic battery backers, so I have a small LiFe pack as a standby should the BEC pack up.

Added a small panel with switches to power off the amp (useful if you don't want to deafen the household every time you want to test something) and a second switch to power on/off the reserve LiFe pack. The BEC and the LiFe are joined by a diode bridge or something like that according to Chris. I have set the BEC voltage .1V above the Life so it should never have to do anything. If the power goes from the BEC to the LiFe then I get a warning.

Eric I know it's all very complex, but it is safer once you master it all.

The sound system is driven by a seperate channel to the throttle stick, and mixed in certain flight modes. This allows me to control the signal driving the sound in the other flight mode.

This will allow me to do a full throttle (sound) flypast at partial throttle (motor) I think that may work well. Anyway we will see.

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If you haven't tried a Neuron esc you don't know what you are missing, full telemetry and smooth throttle right the way through the range. Just wish they did bigger ones! 80A is their biggest.

Cheers

Danny

Eric Robson03/07/2020 07:25:05
294 forum posts
52 photos

Hi Danny, it looks terrific well worth the effort. This is the first time I have heard of Neuron esc's, I will have to get out more. I have had neurotic esc's in the past. I can't believe how you have kept the weight down so much I must be using lead impregnated wood on mine. Looking forward to your first flight and sound video, I have not found out how to upload mine to the forum yet.

Cheers Eric.

Chris Bott - Moderator03/07/2020 10:01:08
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Moderator
6839 forum posts
1429 photos
1 articles

Eric can you get your video onto YouTube? Either on your own YouTube account or through someone else who has one? You need it there to be able to post it here.

Eric Robson03/07/2020 10:54:06
294 forum posts
52 photos

Hi Chris, my Grandson edited my video by taking out the background noise and said he would put it on you tube. I have only seen him briefly at the weekend as he lives a long way from me.

Danny Fenton03/07/2020 16:27:35
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9651 forum posts
4460 photos

I managed a little more detailing:

Firstly a friend Eric printed me a hex radiator core, not as easy as you would first think. Eric has been cadd-ing since DOS days and still found it interesting enough to persevere. Thanks Eric that's yet another pint I owe you.

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I took a look at the Aldis gun-sight. By my reckoning it is 88 mm long by around 5.5 mm. I based my rendition on two straws, some 28swg piano wire and some styrene strip, flat section and half round.

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The piano wire pierces the inner straw and runs along the spine, these is held in place with Sellotape (other tapes are also available lol) Then a second straw is cut length wise and slipped over the first including the piano wire. This restores the shape to a tube without the piano wire being visible.

The styrene bits were added. Finding a glue was a real pain, the straws refused to stick!! thick CA and activator was the order of the day!!

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The hole under the wing was indeed a challenge, as it is litho plate, it was tougher than just Flite-Metal, but I managed with a tiny drill hand held. going up in size one at a time.

The two holes were plugged with micro Bowden outer, thin CA holds them fast. The piano wire legs kinked just enough to grab the tubing. All this based on Eric's idea, thanks mate.

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The legs were sleeved with some stripped servo wire insulation. This was measured from the plan so hopefully pushed down until the insulation touches should set the angle.

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A drop of KK black that's been in the freezer a week (a way to keep it once mixed wink 2  ) PS do defrost it thoroughly before spraying.

Cheers

Danny

Edited By Danny Fenton on 03/07/2020 16:28:52

Ron Gray03/07/2020 17:56:13
2235 forum posts
978 photos

Brilliant detail work Danny and a great tip re the mixed KK paint.

Eric Robson03/07/2020 18:49:35
294 forum posts
52 photos

There you go again weight saving, I use two brass tubes you get a great effect with two straws. Like it.laugh.

Danny Fenton03/07/2020 19:12:47
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9651 forum posts
4460 photos

Te he, my mind is constantly on weight. There have been a few bits added, 1400 LiFe Rx pack for example, and 14 awg power cables, 4mm connectors, so i need to weigh it again as it soon build up these wooden wheels with neoprene tyres are very light.

Cheers

Danny

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