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Search: Posts Made By: Wasson
Showing results 1 to 25 of 134
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07-02-2013, 01:22 PM
Replies: 2,031
Views: 676,606
Posted By Wasson

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Malcolm,

As you know, I am not a contra owner but for whats it's worth I would agree - both with the theory and the practice.

I have flown my Gaudius extensively with both a Mejzlik 20.5 x...
10-17-2011, 12:21 AM
Replies: 40
Views: 7,580
Posted By Wasson

RE: Composite wings, any advantage ?

Hello Ola,

In general I think that lighter wings must be better for the reasons mentioned in your post. That said, I know of one very well respected international class F3A pilot who is alleged...
10-23-2010, 12:10 PM
Replies: 11
Views: 2,616
Posted By Wasson

RE: Combining the best of I/C and Electric Power

Hello Andy,

It’s good to know that we’ll be travelling along the learning curve together.

In making the transition, I have had great support from some of our UK electric specialists. ...
10-23-2010, 03:30 AM
Replies: 11
Views: 2,616
Posted By Wasson

Combining the best of I/C and Electric Power

I read with great interest, Bruno Shiffler’s comments on the development of the new hacker Q80 20P 13S Outrunner - http://www.rcuniverse.com/forum/m_10086881/tm.htm

The idea of combining the...
09-15-2010, 06:39 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

It is fairly unusual to find a pump that fails to operate from new. However the symptoms you describe are not untypical when trying to start a new engine for the first time.

You have done the...
09-09-2010, 04:11 AM
Replies: 47
Views: 6,057
Posted By Wasson

RE: A little help please

Chip,

Best of luck with your new venture.

Names

# Flying Colors
# Smart Art
# Art Nouveau
# Fine Art
09-04-2010, 09:13 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Brett,

If you can PM me your E Mail address, I will send you a copy of an article published in Microsoft Word format (.doc) that may be of some help in explaining the operation of the pressure...
08-27-2010, 01:29 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Hello Apereira,

Your sentiments are spot on.

I enjoyed the discussion and I too hope that we might share a beer some time.

I also hope that Dick's thread will have been of interest to...
08-26-2010, 06:12 PM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Hello Aperiera,

The vexed question of cavitation!

I share your concerns about the possibility of boring other readers. However if I might add to Brett's valuable insight on the matter.
...
08-25-2010, 04:40 PM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Dick,

There is no doubt that higher ambient temperatures will place much greater demands on pump design. However I would take heart from the fact that YS 140 Dingos (apart from the Mark 1) and...
08-24-2010, 09:37 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Keith,

Excellent references.

Particulary interesting to note the following comments in the Sun Hydraulics Paper:

# Switching a manifold from aluminum to ductile iron will reduce the...
08-23-2010, 01:55 PM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Hello Dick,

I'm not quite sure.

I think I read a post somewhere (it may have been based on information that came from Richard V) that the YS175 was unlikely to be available outside Japan...
08-23-2010, 01:18 PM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Dick,

You make an excellent point about the selling of existing stock. I was in 2 minds about whether to share the information for that very same reason. However Yamada san did not say that...
08-23-2010, 10:04 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Hello All,

I have had a very helpful E Mail from Naohisa Yamada. I’m sure that Richard Verano will also have been active behind the scenes.

Yamada san is very well aware of the high...
08-22-2010, 10:14 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Aperiera,

In your last post you say “I really don't think (not saying is not) is a cavitation problem as the pump pressure is not high enough”

Cavitation is less likely to occur at...
08-21-2010, 03:27 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Dick,

That’s good to hear. I hope your rebuilt engine gives you many trouble free hours of flying.

It is also encouraging to learn that YS are considering some design changes. I wish...
08-20-2010, 01:56 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

G'day Mavros,

"Mate I would try increasing the oil content first"

Here in the UK, most of the YS 170's that have suffered damage to the pump valve seats have been running 22% oil.

How...
08-19-2010, 07:04 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Adrian,

"I don't think you have to specifically put fins onto the pump area just to cool them"

I think we might have to disagree on that point.

I accept that good cooling and venting...
08-19-2010, 02:34 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

That's 2 votes now for cavitation. Thank you Australia!

I think that Adrian also makes an excellent point about the pump on the original prototype YS140DZ having to be re-located. I think that...
08-17-2010, 09:10 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

Dear Amram,

I’m not sure about thermal distortion as a possible cause of unreliable pump operation but I couldn’t rule it out.

However I noticed that with Motor #1, you mentioned the...
08-17-2010, 03:51 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

I cannot speak with any authority about YS 170 Cdi’s. I have never owned one as I have yet to be convinced that the claimed benefits outweigh the additional cost, weight and complexity.

I...
08-16-2010, 09:36 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

I agree with Amram. He is an experienced YS user and I don't think his problem has anything to do with his priming or starting sequence.

I think one of the main causes may be premature wear of...
08-16-2010, 02:59 AM
Replies: 249
Views: 57,178
Posted By Wasson

RE: YS 170 DZ CDI

See http://www.rcuniverse.com/forum/m_9001464/anchors_9001464/mpage_1/key_/anchor/tm.htm#9001464

A very common issue with YS170's - both glow and Cdi.

YS 160's did not seem to suffer from...
11-21-2009, 05:33 PM
Replies: 8
Views: 1,791
Posted By Wasson

RE: YS 170 Mechanics - how to get the crank ring back in

Dave,

I really like your proposed method. Provided that the brass ring is of the correct thickness, it strikes me as an excellent way of doing it. (Probably closest to the classic car piston...
11-19-2009, 04:12 PM
Replies: 8
Views: 1,791
Posted By Wasson

RE: YS 170 Mechanics - how to get the crank ring back in

Jon,

With a little bit of practice, it can be done by one person without too much trouble. The YS160 is easier to handle than the YS170 as there is a slight bevel in the crankcase to guide the...
Showing results 1 to 25 of 134
 


 
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