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Search: Posts Made By: bjr_93tz
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02-19-2020, 01:21 PM
Replies: 12
Views: 529
Posted By bjr_93tz

Do you want to fly a Hammer .40? If you add...

Do you want to fly a Hammer .40? If you add length to it then you're not flying a Hammer .40.

A lot of the old designs are short by today's standard, I'm not sure why? Some of the engines back...
01-24-2020, 02:34 AM
Replies: 17
Views: 2,958
Posted By bjr_93tz

It's a cruel fact of geometry that flying closer...

It's a cruel fact of geometry that flying closer in or further out doesn't change some relationships. No matter how far or close you fly, a Cuban Eight flown to the top of the box must be out of the...
01-23-2020, 03:14 PM
Replies: 17
Views: 2,958
Posted By bjr_93tz

Seriously gents, if you don't have CAD just grab...

Seriously gents, if you don't have CAD just grab a compass and set square and actually draw what we're supposed to be flying.

Not many manoeuvres can be flown to the top of the box without being...
01-21-2020, 08:50 PM
Replies: 49
Views: 6,159
Posted By bjr_93tz

Sort of reminds me of this scene... there's a...

Sort of reminds me of this scene... there's a longer version out there for context but this couple of seconds sums it up.

https://www.youtube.com/watch?v=bTNxzYjzsG4
12-22-2019, 02:04 PM
Replies: 44
Views: 5,337
Posted By bjr_93tz

Way back when I was having the first round of...

Way back when I was having the first round of issues with my DZ170cdi, I stretched the springs in the pump so the valves would seat with more pressure.

While it worked fine in my hand with a large...
12-19-2019, 06:17 PM
Replies: 17
Views: 2,958
Posted By bjr_93tz

Going all the way to the top of the box simply...

Going all the way to the top of the box simply isn't going to work here.
https://cimg9.ibsrv.net/gimg/www.rcuniverse.com-vbulletin/1144x577/p21_z_comet_a95556da0f7b0e57d880cff414ff882028cdb91b.jpg...
12-19-2019, 06:15 PM
Replies: 17
Views: 2,958
Posted By bjr_93tz

Are you sure performing the loop high gives you...

Are you sure performing the loop high gives you more room for the 4 point roll?
...
12-16-2019, 02:52 PM
Replies: 17
Views: 2,958
Posted By bjr_93tz

I haven't done it for the past sequence but given...

I haven't done it for the past sequence but given the discussion I might do it for P21, that is draw the sequence in AutoCAD. Drawing up the sequence in CAD is a good way of figuring out how a...
09-19-2019, 01:26 PM
Replies: 32
Views: 6,197
Posted By bjr_93tz

I was just throwing out a very simplified example...

I was just throwing out a very simplified example tarred with a very wide brush, to illustrate that thrust at speed needs power, no if's no but's.
Unlike some of the lightweight aerobatic floaters...
09-18-2019, 02:48 PM
Replies: 32
Views: 6,197
Posted By bjr_93tz

Yes, people tend to forget that thrust at speed...

Yes, people tend to forget that thrust at speed requires power.

Simple case is 6lbs of thrust @ 100MPH requires close to 1200W at 100% efficiency, 1400W at your 85% efficiency.

Only 6lbs of...
09-16-2019, 10:02 PM
Replies: 32
Views: 6,197
Posted By bjr_93tz

I ran a Scorpion HK-4035-400KV (8mm shaft heli...

I ran a Scorpion HK-4035-400KV (8mm shaft heli motor) on 10S in my Curare once. It was either an 11x9 or 11x10 apc at about 13,000 rpm static.

It was a proof-of-concept, where I pulled the OS...
08-27-2019, 06:59 PM
Replies: 7
Views: 1,819
Posted By bjr_93tz

Funny story with my new DZ200cdi I sent back to...

Funny story with my new DZ200cdi I sent back to YS japan 'cos it wouldn't idle as I thought it should.

I got the "runs fine, no problems to see here" story and they sent it back. The prop driver...
08-26-2019, 05:17 PM
Replies: 7
Views: 1,819
Posted By bjr_93tz

(1) Ask Richard what fuel he used and what prop...

(1) Ask Richard what fuel he used and what prop he ran on it would be a good start.

However, if it's an pre-low oil, pre-cdi (ie early glow) DZ170 then a 19x11 is a bit on the large size, and...
08-14-2019, 03:34 PM
Replies: 97
Views: 16,237
Posted By bjr_93tz

Yeah, I've only got the one silencer so I have to...

Yeah, I've only got the one silencer so I have to look after it...

Nerdy me decided to run one or two of your videos through "Audacity" to figure out what RPM some of those YS engines were...
08-13-2019, 05:57 PM
Replies: 97
Views: 16,237
Posted By bjr_93tz

Looks like an "old" Hatori 821 silencer, not the...

Looks like an "old" Hatori 821 silencer, not the shorter one or YS power pipe??
07-11-2019, 08:11 PM
Replies: 49
Views: 6,159
Posted By bjr_93tz

The big carbon APC prop knocked some sense into...

The big carbon APC prop knocked some sense into my DZ200cdi and made it usable but to be honest my enthusiasm for F3A did get blunted a lot and I haven't flown it since way back. In fact I haven't...
07-09-2019, 02:23 PM
Replies: 49
Views: 6,159
Posted By bjr_93tz

Smile The manuals for the 110 vs 110s suggest the "s"...

The manuals for the 110 vs 110s suggest the "s" is 0.5mm less in length and 0.5mm less in height.

Maybe the "s" designation stands for "short"? :confused:

Or.... maybe just like in the Superman...
06-11-2019, 07:12 PM
Replies: 23
Views: 6,918
Posted By bjr_93tz

I've seen one in the skin, the wings are a looong...

I've seen one in the skin, the wings are a looong way back from the front of the plane.

I can only imagine they sacrificed tail moment to be able to place the CG further back down the fuselage to...
03-29-2019, 04:10 PM
Replies: 243
Views: 30,988
Posted By bjr_93tz

That's sort of what I noticed with mine Scott, in...

That's sort of what I noticed with mine Scott, in that if you keep the idle up it runs like a swiss watch but trying to drop it below that doesn't seem to work well. It doesn't seem that the engine...
03-29-2019, 03:36 AM
Replies: 243
Views: 30,988
Posted By bjr_93tz

I gave a 19x11 a run on my 200cdi when I first...

I gave a 19x11 a run on my 200cdi when I first got it. Fantastic top end power and quite good most everywhere else except idle. If I tried to set it up for an idle below 2500 rpm I'd end up with all...
01-30-2019, 02:23 PM
Replies: 24
Views: 1,474
Posted By bjr_93tz

I feel your pain. I drive this 35yo clunker and...

I feel your pain. I drive this 35yo clunker and have about 2.35m (~7foot 8 inches) from the back of the front seats (rear seats fold flat too) to the lift gate and was very surprised and...
12-15-2018, 01:41 AM
Replies: 2
Views: 594
Posted By bjr_93tz

It doesn't help with your question, however...

It doesn't help with your question, however depending on the radio setup I extend the life of some of my servos by popping the servo arm, adjust the subtrim by one spline and put the arm back on.
...
11-13-2018, 02:23 PM
Replies: 31
Views: 1,300
Posted By bjr_93tz

They'd probably do the job if you were hand...

They'd probably do the job if you were hand starting it.

Let me know when your ready, I'll come down, hold your beer, stand back and watch you give it a go..... ;)
11-08-2018, 08:21 PM
Replies: 20
Views: 3,385
Posted By bjr_93tz

Yes, it's built up for most of what I build too. ...

Yes, it's built up for most of what I build too.

I never really worried about grain (and density) until I built a Bubble Dancer RES glider and realised how much difference selecting the right...
11-08-2018, 07:04 PM
Replies: 20
Views: 3,385
Posted By bjr_93tz

Thanks for the post. Just one (very small)...

Thanks for the post.

Just one (very small) point. It's difficult to see from the photo's and there may have been other reasons I can't see, however IF the grain (green lines) is/was what it looks...
Showing results 1 to 25 of 500
 


 
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