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  #461  
Old 11-23-2019, 06:56 AM
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DanH DanH is offline
 
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Originally Posted by charosenz View Post
I am fortunate that this engine did not create any appreciable pressure at 5 lbs of boost with the 1/4" vent lines. If it did, it was less than what I could see on the MAP gauge I was using, probably 1 lb or less.
Case pressure is typically measured in units much smaller than PSI. For example, the Lycoming case pressure limit is something like 4~5 inches of water. One (1) psi is 27.67 inches H2O. Perhaps a re-test with a manometer? I'd expect a healthy Honda to exhibit less blowby than a Lycoming, so an accurate baseline captured now may be useful as a diagnostic tool later.
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  #462  
Old 11-23-2019, 03:15 PM
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charosenz charosenz is offline
 
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Default Crankcase pressure

Dan,

Good point. I have read the high boost guys with high end dynos actually measure SCFM. Ultimately though when it comes to problem I think it is fair to say that PSI is what will cause things like seals and gaskets to leak and worse fail. I've seen quite a few charts that show the SCFM and PSI per hose diameter unfortunately most charts are geared towards high pressure. I have not found one with good specs on lower pressre (i.e. 0.5 - 3.0 psi) as it relates to say 0.125" - 0.50" hose size.) If you find one please post. Same with an easy way to measure, say, 0.2" to 2.0" scfm. Other than to extapolate the SCFM with known credible PSI and Hose I.D. numbers.

EDIT: I forgot to mention the manometer is a good idea. I think I detected some suction on low RPM. So the current home man manometer will have to be redesigned. And dang, allowing for suction and up to say 30In is one tall manometer! I just need more time to do all of this.

Aside from this, I have to admit pushing this set up in to boost is on the edge. Last time I crept up to 4500 rpm at 40" MAP I actually felt it starting to lift and get really light on the right gear. Needless to say I quickly reduced the power. Without wings on the fuse, it is just not stable enough in the roll axis to push it very hard. So higher MAP crank case pressure testing may have to wait until the wings are on it.

Thanks.

Charlie.

Last edited by charosenz : 11-23-2019 at 04:30 PM.
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  #463  
Old 11-30-2019, 09:12 PM
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charosenz charosenz is offline
 
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Default Digital low pressure gauge

I found this digital low pressure gauge. I bench tested it and it seems to read down to 0.30 psi and increases on tenths of PSI. It even quickly measure pressure from simply blowing in it. (even though it states it is 0.5 psi resolution. Cheap too readily available on Amazon or Ebay.

Dan's idea of a manometer is still a very good choice, this is a simple option as well.



charlie
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  #464  
Old 12-16-2019, 10:43 PM
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Default Update trim relay boards

All is well with the Honda Project. The engine is running great and I am working on a few aspects of the project that are not directly tied to the Honda engine itself. None the less I thought I would provide an update.

I am working on the electrical system and that includes the stick grip switches. I purchased the infinity Aerospace grips a long time ago and at this point I needed relays for Elevator, Aileron and flaps.

I found a diagram that Bob Nucklos on the Infinity website that shows the components necessary to build your own relay deck. I thought it would be fun and an inexpensive project.

So I created my own PCB using a free tool called EasyEDA and then had the blank PCB built and added the components myself.

Here is a picture of the Trim Relay boards I built.


It is an ingenious system that allow the trim and flap motors to reverse direction by simply grounding two wires off the grip switch.

Here is the diagram in a simplified view.



I am willing to sell these for a modest cost if you are interested PM me.

Charlie
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  #465  
Old 12-17-2019, 08:30 PM
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Piper J3 Piper J3 is offline
 
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Charlie -

Are the trim motors adjustable for speed? I converted my RV-12 to Ray Allen with two-speed trim. Very slow speed in cruise and fast trim in slow flight in the pattern. Speed is selectable with toggle switch. Makes airplane a pleasure to fly...

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Last edited by Piper J3 : 12-17-2019 at 08:34 PM.
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  #466  
Old 12-17-2019, 11:32 PM
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loopfuzz loopfuzz is offline
 
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Default cool

Fun to see projects like this. Hope it works out well for you. You are not to far away from me. Near Battle Ground.

Cheers!
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  #467  
Old 12-18-2019, 09:49 AM
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charosenz charosenz is offline
 
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Originally Posted by loopfuzz View Post
Fun to see projects like this. Hope it works out well for you. You are not to far away from me. Near Battle Ground.

Cheers!
Thanks. You are always welcome to come visit if you want to see it in person. We also have a good EAA Chapter meeting each month. Here is our website.

http://www.eaa1111.org/monthly-meeting/

Charlie
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  #468  
Old 12-18-2019, 09:51 AM
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charosenz charosenz is offline
 
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Quote:
Originally Posted by Piper J3 View Post
Charlie -

Are the trim motors adjustable for speed? I converted my RV-12 to Ray Allen with two-speed trim. Very slow speed in cruise and fast trim in slow flight in the pattern. Speed is selectable with toggle switch. Makes airplane a pleasure to fly...

Jim,

I had not thought of that. Good idea. So is your "slow" equal to RA stock or is the fast setting equal to stock?

Charlie
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  #469  
Old 12-18-2019, 11:33 AM
BillL BillL is offline
 
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Originally Posted by charosenz View Post
Jim,

I had not thought of that. Good idea. So is your "slow" equal to RA stock or is the fast setting equal to stock?

Charlie
Charlie, I do the same on my 7 and fast is full speed with the slow being set by a ray allen trim pot. I tested for a few months until I liked the speed then hid, ahh, errr . . . . relocated it behind the panel
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  #470  
Old 12-18-2019, 01:06 PM
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charosenz charosenz is offline
 
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Quote:
Originally Posted by BillL View Post
Charlie, I do the same on my 7 and fast is full speed with the slow being set by a ray allen trim pot. I tested for a few months until I liked the speed then hid, ahh, errr . . . . relocated it behind the panel
Good to know and sounds real simple...I like that.

Charlie
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