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Offline H0  
#1 Posted : 09 February 2016 20:26:54(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 15,254
Location: DE-NW
Hi!

I made an Excel file to help those who want to use a stopwatch to determine the scale speed of their model locos.

The file should open with Excel 97 or newer. I don't know if the Excel Viewer will be enough.

I hope the formulae are correct. The sheets are protected, but the file is Open Source (see Readme sheet for the password).
mrrspeed.zip (11kb) downloaded 117 time(s).
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
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thanks 10 users liked this useful post by H0
Offline RayF  
#2 Posted : 09 February 2016 21:13:44(UTC)
RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,838
Location: Gibraltar, Europe
Thanks Tom.

Very useful!

Using my DHG700 (a 3088 converted to digital with LPV2 decoder and Hamo magnet) running the length of my front straight (108cm) I got these values:

Min speed (step 1) = 3 km/h

Typical shunting speed (step 2) = 12 km/h

Typical running speed (set visually) = 37 km/h

Max speed Scared = 169 km/h

Edited by user 10 February 2016 08:36:53(UTC)  | Reason: Not specified

Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
thanks 1 user liked this useful post by RayF
H0
Offline H0  
#3 Posted : 10 February 2016 08:20:31(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 15,254
Location: DE-NW
Thanks, Ray.

Now we need results for a DHG 700 with only one powered axle for comparison. They have a completely new gear and maximum speed could be lower.


If anybody has ideas to make the sheet more useful, please let me know. Simple wishes may come true.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
thanks 1 user liked this useful post by H0
Offline RayF  
#4 Posted : 10 February 2016 08:35:16(UTC)
RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,838
Location: Gibraltar, Europe
Originally Posted by: H0 Go to Quoted Post
Thanks, Ray.

Now we need results for a DHG 700 with only one powered axle for comparison. They have a completely new gear and maximum speed could be lower.


If anybody has ideas to make the sheet more useful, please let me know. Simple wishes may come true.


Hi Tom,

I started making some tests with my recent model of a DHG500 for comparison. I believe it's equipped with the same mechanism as the new DHG700. In fact the exploded diagram of the DHG700 actually shows the body of a DHG500.

I'll finish those tests when I get home today and post them here. I can tell you that the low speed values were actually quite similar and that the highest speed still seemed to me to be too high, but I didn't get around to measuring it.

Edit: These are the values for the DHG500 (New tooling)

Min speed (step 1) = 4 km/h

Typical shunting speed (step 2) = 13 km/h

Typical running speed (set visually) = 42 km/h

Max speed = 170 km/h

Rather surprisingly, the values at the four speed settings I chose are virtually identical between the two types, even though they have a completely different motor and gearing system!

Edited by user 11 February 2016 09:46:19(UTC)  | Reason: Not specified

Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
Offline RayF  
#5 Posted : 10 February 2016 18:00:29(UTC)
RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,838
Location: Gibraltar, Europe
Please note the comparison of speed values above between a new and old tooling shunter. They are almost identical!
Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
thanks 1 user liked this useful post by RayF
Offline H0  
#6 Posted : 10 February 2016 23:37:16(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 15,254
Location: DE-NW
I did some speed tests today (using a PC as stopwatch, Excel sheet not in use).

Tested a Märklin TRAXX loco class 185.0. Top speed was 212 km/h. Prototype speed is 140 km/h.

Tested a DHG 700 loco with factory-installed Delta decoder. Top speed was 246 km/h.

Testes a DHG 700 loco with factory-installed fx decoder. Top speed was 220 km/h.

Both DHG 700 locos are the old type with three powered axles, the TRAXX loco is a hobby loco with metal body.

I have a BR 120.1 loco that can do 300+ km/h (prototype speed 200 km/h).

I only know very few Märklin models that are slower than 100% prototype speed.


I used a CU 6021 for the tests. I expect to see lower top speeds when using an MS2, but I don't have time for a second test series tonight.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
Offline baggio  
#7 Posted : 11 February 2016 01:56:08(UTC)
baggio

Canada   
Joined: 21/09/2012(UTC)
Posts: 1,729
Location: Toronto
Thank you, guys. BigGrin

VERY interesting, but I have to admit I will have to digest it all a bit more...Unsure Blushing

Thanks to all for putting in the time for getting to the bottom of the problem.

ThumpUp
Offline H0  
#8 Posted : 11 February 2016 22:26:19(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 15,254
Location: DE-NW
Tested the same three locos again, but this time using an MS2 with the standard power supply (18 V DC).

The top speed for the TRAXX loco was 164 km/h. With CU 6021 it was 212 km/h.
The top speed for the DHG 700 loco with Delta decoder was 199 km/h. With CU 6021 it was 246 km/h.
The top speed for the DHG 700 loco with fx decoder was 217 km/h. With CU 6021 it was 220 km/h.

The first two locos have can motors and it seems the speed is limited by the motor. Higher track voltage leads to higher speed.
The DHG 700 with fx decoder and c90 motor seems to be limited by the decoder - higher track voltage has no effect on the maximum speed.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
UserPostedImage
thanks 2 users liked this useful post by H0
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