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Search: Posts Made By: 1967brutus
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Yesterday, 12:17 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

Yup... a leak in the general area of the intake...

Yup... a leak in the general area of the intake seat, be that a leaking valve or a leaking seat, will strongly affect the required needle settings for a good idle mixture and also affect the ability...
11-29-2022, 11:55 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

I saw it used in repairing cracked car windows,...

I saw it used in repairing cracked car windows, and I believe it also is sometimes used to fix difficult leaks in oldtimer parts. It won't work in larger engines, but I think it could work in small...
11-29-2022, 07:28 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

If you have the access to a deep vacuum chamber,...

If you have the access to a deep vacuum chamber, apply a bead of high strength high temperature Loctite or other sealant/threadlocker and place the head in a deep vacuum chamber. Expose the head to...
11-29-2022, 12:48 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

I've seen worse: ...

I've seen worse:

https://www.youtube.com/watch?v=PbKqNqrxd5U

The engine ran perfectly fine with that... :D
11-24-2022, 10:27 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

That is why in the "real world", there are not...

That is why in the "real world", there are not many fuel injected air cooled engines. Because the engine temperature cannot be properly controlled.
11-23-2022, 12:13 PM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

:D not worried about that at all :D

:D not worried about that at all :D
11-23-2022, 11:33 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

I believe these Stihl M-tronic carbs can be had...

I believe these Stihl M-tronic carbs can be had for a few tenners from China... But where's the fun in that?
11-17-2022, 02:18 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

Anything that clearly makes the throttle movement...

Anything that clearly makes the throttle movement visible, works, but it would limit the possible camera angles, and it is a very small item.
11-16-2022, 07:44 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

Won't work... the difference in volumetric...

Won't work... the difference in volumetric efficiency is WAY too large.

Years ago, I experimented with direct volumetric metering. I used an old window-washer pump (one with a rubber impeller,...
11-16-2022, 07:25 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

Order of magnitude of 0,04~0,05 mm

Order of magnitude of 0,04~0,05 mm
11-14-2022, 01:26 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

Chris, can I suggest something? Can you make...

Chris, can I suggest something?

Can you make a visual indicator on your teststand for throttle movement? That makes it easier for us to judge how well the engine follows the throttle.
I am saying...
11-13-2022, 02:36 PM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

0,9 psi is 62 mBar, correct? If so, that is...

0,9 psi is 62 mBar, correct? If so, that is pretty consistent with what I measured which was around 60 cm of water column.

That pump indeed is fairly small. What kind of service life expectation...
11-13-2022, 09:26 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

That makes sense: at peak RPM, there is that...

That makes sense: at peak RPM, there is that small range where the improved efficiency of leaning out basically cancels out the reduces supply of energy, AKA RPM remaining constant, but because of...
11-13-2022, 06:45 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

Ah, OK... so basically the pump is a repeater of...

Ah, OK... so basically the pump is a repeater of the actually measured value, and tank pressure would be identical to conventional muffler pressure?
I sure don't see why that would not work. It...
11-13-2022, 06:14 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

nfortunately, no... The muffler pressure is...

nfortunately, no... The muffler pressure is related to both RPM and throttle opening. If in my helicopter with the gasser (electronically governed) pitch is added, the governor opens the throttle and...
11-13-2022, 05:00 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

That's not half bad indeed, and that engine is a...

That's not half bad indeed, and that engine is a nice runner.

For what it is worth: I had similar adjustments programmed on some planes but the adjustment would act on the solenoid, and that way...
11-13-2022, 04:47 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

Three options: 1-Lower pressure range (this...

Three options:
1-Lower pressure range (this will make the influence of the self-controlling properties of the engine more pronounced because carb vacuum can play a larger role)
2-modifying needle...
11-12-2022, 10:30 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

It is what it is, and I think I was pushing it...

It is what it is, and I think I was pushing it too much with that handlaunch attempt.
I was a bit frustrated because I had the plane airborne ONCE, but that happened exactly when I decided to abort...
11-12-2022, 08:23 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

Looks like I really have to redesign the landing...

Looks like I really have to redesign the landing gear set-up, because again, I could not get the Delta to fly, and in attempts to handlaunch it, I basically wrecked the retracts... :(

Oh well, I...
11-12-2022, 01:11 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

I could try and figure that out, bt I ain't got...

I could try and figure that out, bt I ain't got the time left for that.

But in all fairness, I don't think packing the springbox will help, because it does not change the regressive characteristic...
11-11-2022, 12:39 PM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

As I said, I don't see options to wind a heavier...

As I said, I don't see options to wind a heavier gauge than what they used, on such a narrow core. I am not able to find any heavier springs commercially and I am not able to wind my own.
It appears...
11-11-2022, 11:32 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

I wish I could... The only thing in my stash that...

I wish I could... The only thing in my stash that comes close are a few ASP valvesprings for a 91 fourstroke. Those are (way) too short and wound a touch too wide. Because I tried to find alternative...
11-11-2022, 09:19 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

At the time I had no other option: Either 5" aft...

At the time I had no other option: Either 5" aft of CoG, or 1" or less, because of the wing main spar. And I did not want to do that, because of the earlier X1200: that thing had its main wheels...
11-11-2022, 07:47 AM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

To be honest, stress made that I do not have a...

To be honest, stress made that I do not have a razorsharp memeory of how it flew. I faintly remember the aillerons being a bit vague, and the elevator fairly OK. At least, the wind indeed was...
11-10-2022, 07:46 PM
Replies: 1,228
Views: 27,006
Posted By 1967brutus

That was actually the issue: Static, it stands...

That was actually the issue: Static, it stands 3,5 degrees positive. When rolling, the nose dips with increasiong speed until fully compressed at 0,9 degree negative: The nose (measured at the tip)...
Showing results 1 to 25 of 328
 


 
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