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Search: Posts Made By: Raiz
Forum: GPS 06-11-2019, 11:22 AM
Replies: 174
Views: 29,241
Posted By Raiz
Amazing - they are efficient - thank you

Amazing - they are efficient - thank you
Forum: GPS 06-11-2019, 02:31 AM
Replies: 174
Views: 29,241
Posted By Raiz
Power consumption of GNX 375 and GPS 175?

Can anybody point me to the current draw (continuous and peak) for the GNX 375 and GPS 175?

Thanks
Forum: RV-10 04-07-2019, 06:03 AM
Replies: 4
Views: 751
Posted By Raiz
Jack, great choice! I don't know the regulations...

Jack, great choice!

I don't know the regulations in the Netherlands but, in case it is useful, this is the guidance on creating your own maintenance schedule provided by the LAA in the UK:...
Forum: Electrical Systems 03-13-2019, 12:21 PM
Replies: 12
Views: 1,190
Posted By Raiz
I'm with you Rob but, to answer your question,...

I'm with you Rob but, to answer your question, the IBBS is convenient. You can achieve a good level of resilience without needing to think too hard about the electrical system architecture.
Forum: Glass Cockpit 03-13-2019, 12:17 PM
Replies: 288
Views: 92,860
Posted By Raiz
+1 (and some extra text to make the character...

+1
(and some extra text to make the character count)
Forum: RV-10 02-28-2019, 05:23 AM
Replies: 9
Views: 1,052
Posted By Raiz
Sion - coincidence

Hi Yannick and welcome to this great community. I used to be based at Sion (with the Groupe de Vol ŗ Moteur) and now I'm just about to start building an RV-10 with a plan to fly it there from...
Forum: RV-10 02-23-2019, 02:00 PM
Replies: 17
Views: 929
Posted By Raiz
It'll be fine

Sean, it will draw milliamps, so 22 gauge will be absolutely fine. The clue is in the name "discrete output", details of which are in section 26.5.9 of the G3X touch manual.

When the probe is on...
Forum: Electrical Systems 02-16-2019, 07:36 PM
Replies: 6
Views: 654
Posted By Raiz
800 milliamps

I was sure it was 800 milliamps but it took me a while to find the source. It's in the FAQs section (http://www.rayallencompany.com/RACinfo/FAQs.html#Anchor-What-49575) on the Ray Allen website: ...
Forum: RV-6/6A 01-11-2019, 04:24 AM
Replies: 82
Views: 81,666
Posted By Raiz
It looks like one of these...

It looks like one of these https://www.air-avionics.com/?page_id=253. Garrecht products are now sold under the Air Avionics brand.
Forum: RV General Discussion/News 11-28-2018, 02:20 PM
Replies: 6
Views: 1,042
Posted By Raiz
Welcome Andrew! I hope you donít mind a new...

Welcome Andrew! I hope you donít mind a new product suggestion in response to your offer. Would it be possible to have sun visors that attach to the overhead console in the RV-10?
Ray
Forum: Autopilots 11-28-2018, 02:14 PM
Replies: 15
Views: 3,684
Posted By Raiz
Thanks Steve Ray

Thanks Steve
Ray
Forum: Autopilots 11-28-2018, 11:04 AM
Replies: 15
Views: 3,684
Posted By Raiz
Thank you Steve and Mark, I hadn't appreciated...

Thank you Steve and Mark, I hadn't appreciated how it works. One more question though, is it the 5 amp autopilot breaker (supplying the GSA 28) that limits the current to the trim motor while the...
Forum: Autopilots 11-28-2018, 01:36 AM
Replies: 15
Views: 3,684
Posted By Raiz
I'm never sure whether it's best to resurrect an...

I'm never sure whether it's best to resurrect an old, but related thread, or start a new one but I'll give it a try.

Looking at the G3X install manual, a 5 amp breaker is called out for the trim...
Forum: RV-10 10-14-2018, 11:23 PM
Replies: 4
Views: 1,055
Posted By Raiz
Not sure whether you've seen this thread ...

Not sure whether you've seen this thread (http://www.vansairforce.com/community/showthread.php?t=163276&highlight=earthx)about a cooled battery FWF on a -10. That said, I'd still prefer to put it...
Forum: RV-10 05-17-2018, 06:48 AM
Replies: 5
Views: 1,369
Posted By Raiz
This thread ...

This thread (http://www.vansairforce.com/community/showthread.php?t=115825)could be a good starting point, although neither of the RV-10s have exactly the same spec as yours.

You could also check...
Forum: RV-14 04-28-2018, 02:10 AM
Replies: 17
Views: 5,050
Posted By Raiz
From a European member...

NACA deduced that the propeller noise dominates and that exhaust noise is next in light propeller driven airplanes. Here is a snippet from the summary of this ...
Forum: Electrical Systems 04-09-2018, 01:37 PM
Replies: 46
Views: 11,504
Posted By Raiz
Increasing the speed of gear driven alternator

Has anyone thought about putting a gearbox between the accessory pad and the alternator to increase the rotation speed?
Forum: Electrical Systems 04-06-2018, 12:18 PM
Replies: 3
Views: 952
Posted By Raiz
Here ya go

Yes, they are Honeywell AML switches and the white rockers come off to reveal the lamp inside. Here are a couple of links that might help:...
Forum: Glass Cockpit 06-04-2017, 10:31 AM
Replies: 4
Views: 1,295
Posted By Raiz
Hi Nick The GNC255A doesn't have dual isolated...

Hi Nick

The GNC255A doesn't have dual isolated power input circuits (like the GEA24, GSU25 and G3X have). This leaves you with the following options:

1. Power the GNC255A only from the IBBS
2....
Forum: Glass Cockpit 04-14-2017, 01:42 PM
Replies: 10
Views: 1,946
Posted By Raiz
Autodimming for panel lights?

Most avionics now have photocells built in that dim the display automatically in response to the ambient light level. I'd like to do this for the other lights in my panel like those in the switches...
Forum: RV-10 02-12-2017, 09:00 AM
Replies: 42
Views: 11,016
Posted By Raiz
Saf-Air valve

Do you mean this one (http://www.saf-air.com/fuelvalves.html#LockOpen)? Looks ideal, thanks.
Forum: RV-10 02-12-2017, 12:53 AM
Replies: 42
Views: 11,016
Posted By Raiz
Same reason for me. The U.K. is similar to...

Same reason for me. The U.K. is similar to Canada in that an alternate static or a heated static port is mandatory for IFR.

Ideally, I want the switch where I can see it, so I no it's not on by...
Forum: RV-10 02-11-2017, 11:15 AM
Replies: 42
Views: 11,016
Posted By Raiz
Alternate alternate static air

I've been contemplating doing this with a small solenoid valve and an electrical switch on the panel. The main reason is that Stein's (excellent) valve doesn't look right on my panel alongside the...
Forum: Electrical Systems 12-27-2016, 05:31 AM
Replies: 2
Views: 1,331
Posted By Raiz
Z-14 circuit protection and diode-isolated power feeds

Many of the avionics boxes now come with dual diode-isolated power feeds and I'm wondering what is best practice for circuit protection when using a Z-14 (dual bus) architecture.

With a separate...
Forum: Glass Cockpit 12-14-2016, 02:02 AM
Replies: 6
Views: 3,539
Posted By Raiz
PilotAware

I have no direct experience but I suggest you also take a look at PilotAware (http://www.pilotaware.com/). They have a device that can do P3i (their own but open standard), ADS-B, FLARM, Mode S and...
Forum: Reviews 08-19-2016, 04:51 AM
Replies: 26
Views: 14,370
Posted By Raiz
Looks like a great product

What is the power requirement - how many amps?
Forum: RV General Discussion/News 07-29-2016, 01:10 PM
Replies: 39
Views: 11,200
Posted By Raiz
Awesome

This forum is amazing. Within minutes there are several things that I would never have thought of. Thank you.

I've only been stranded twice - both times it was the left (impulse mag) but in...
Forum: RV General Discussion/News 07-29-2016, 10:47 AM
Replies: 39
Views: 11,200
Posted By Raiz
What's left you stranded?

My intended mission involves visiting remote places, so I'm putting some thought into how to provide a "get home capability", for each of the common failures.

Have you ever been stranded by a...
Forum: RV-10 07-29-2016, 10:32 AM
Replies: 12
Views: 4,644
Posted By Raiz
I've not done it myself but I believe the Swiss...

I've not done it myself but I believe the Swiss amateur build association (EAS) organises a noise testing "event" about twice a year. However, you don't need a noise certificate for a lot of...
Forum: Glass Cockpit 05-13-2016, 01:51 PM
Replies: 3
Views: 1,157
Posted By Raiz
At least some of the companies you mentioned...

At least some of the companies you mentioned provide actual size pdf files that you could print and use to create a comparison e.g. AFS 5600 here...
Forum: ADS-B 09-09-2012, 08:06 AM
Replies: 28
Views: 5,795
Posted By Raiz
Credit card sized sounds right

I asked the Dynon guy at Sywell and he said half of that tall narrow panel will be for the advanced A/P. A quick look at the back confirmed that there were indeed two cut-outs of about credit-card...
Forum: RV-7/7A 10-07-2010, 02:31 AM
Replies: 97
Views: 33,959
Posted By Raiz
Soft ground

Steve I think you make a very good point. The soft ground not only moves the rears back but it also creates a braking effect on the mains, which also tends to load up the nose gear even more.

Soft...
Forum: RV-7/7A 09-02-2010, 01:42 PM
Replies: 97
Views: 33,959
Posted By Raiz
Nose gear failures much more likely in the UK

Now here's one to get you thinking. The equivalent anaysis of leg failure rates for the UK Vans fleet shows they are much more likely to suffer nose leg failure than the US fleet:

Model...
Forum: RV-7/7A 09-02-2010, 01:15 PM
Replies: 97
Views: 33,959
Posted By Raiz
Nose leg failure statistics

The following results come from the NTSB database and include all accidents in the period 1/1/2000 to 12/31/2009. Actually, there is one exception (N448GM), which is in the FAA study but apparently...
Forum: RV General Discussion/News 08-28-2010, 11:28 AM
Replies: 7
Views: 2,413
Posted By Raiz
Popularity of Trigear vs Taildragger by model

I'm NOT trying to start a "which end is best for the 3rd wheel debate" but this graph might interest some of you. It shows how many RV-6s, 7s, 8s and 9s of each type are flying in the...
Forum: RV-7/7A 08-27-2010, 02:33 AM
Replies: 97
Views: 33,959
Posted By Raiz
Paul, I agree entirely. I have no intention of...

Paul, I agree entirely. I have no intention of proposing a change to the fleet without proper validation but I do intend to extract whatever useful information I can from the analysis. I'd be happy...
Forum: RV-7/7A 08-26-2010, 03:15 PM
Replies: 97
Views: 33,959
Posted By Raiz
Comparison of 6A, 7A, 8A and 9A

Ok, so in an earlier post, I promised to look at a comparison of the 6A, 7A, 8A and 9A. I've assumed the RV8A leg is the same as the others (but I don't know this for sure). I used a 10 ft long,...
Forum: RV-7/7A 08-24-2010, 02:48 PM
Replies: 97
Views: 33,959
Posted By Raiz
I think you are absolutely right about the rears...

I think you are absolutely right about the rears being shorter on the 6 but the nose leg is the same part number U-603-3 on the 6A, 7A and 9A. The 8A has a different leg U-809-2 but I've no idea...
Forum: RV-7/7A 08-24-2010, 02:38 PM
Replies: 97
Views: 33,959
Posted By Raiz
Pete, I have that impression too, i.e. that...

Pete, I have that impression too, i.e. that RV-6As typically operate at lower nose load but I also don't have any good data, so anything you can dig up would be good.

This diagram illustrates your...
Forum: RV-7/7A 08-23-2010, 02:58 PM
Replies: 97
Views: 33,959
Posted By Raiz
PCHunt, this must be a misunderstanding, because...

PCHunt, this must be a misunderstanding, because the model does predict the leg will fold under in all cases when the aircraft is moving forwards. It predicts the point of initial yielding will be...
Forum: RV-7/7A 08-23-2010, 02:37 PM
Replies: 97
Views: 33,959
Posted By Raiz
RV-6A better than RV-7A?

Hi hevansrv7a, your post got me thinking and I ran some RV-6A cases on the model. On an equal nose wheel weight basis, the RV-6A results are similar to the RV-7A. This surprised me, because I also...
Forum: RV-7/7A 08-23-2010, 01:27 AM
Replies: 97
Views: 33,959
Posted By Raiz
I agree. In the case of the RV-7A nose gear, it...

I agree. In the case of the RV-7A nose gear, it bounces.

Raiz
Forum: RV-7/7A 08-22-2010, 02:56 PM
Replies: 97
Views: 33,959
Posted By Raiz
Think9a, ok, the easy questions first: Yes...

Think9a,

ok, the easy questions first: Yes buckling is taken into account and I have modelled a non-constant cross section, solid leg based on measurements of an actual RV-7A leg (new type) made...
Forum: RV-7/7A 08-18-2010, 06:03 AM
Replies: 97
Views: 33,959
Posted By Raiz
terrye, I was also unable to find good data on...

terrye, I was also unable to find good data on the 11x4.00-5 tire but the method used in the FAA study can be applied to any tire size. I therefore modeled the 11x4.00-5 tire (not the 5.00-5/6...
Forum: RV-7/7A 08-17-2010, 03:16 PM
Replies: 97
Views: 33,959
Posted By Raiz
hevansrv7a, You are right, potholes (as we call...

hevansrv7a,

You are right, potholes (as we call them in the UK) are worse than mounds, especially if the falling nose meets the ground coming up on the far side of the hole. Here is a 2" deep hole,...
Forum: RV-7/7A 08-17-2010, 02:50 PM
Replies: 97
Views: 33,959
Posted By Raiz
Sorry terrye but I interpret Pazmany's graphs...

Sorry terrye but I interpret Pazmany's graphs differently. Graph 3 is simply the area above the curve from graph 2, so they are effectively the same. Pazmany explains this in his book. ...
Forum: RV-7/7A 08-17-2010, 02:04 PM
Replies: 97
Views: 33,959
Posted By Raiz
At very low speed, the airplane rides up over the...

At very low speed, the airplane rides up over the bump but at higher speeds there is insufficient time for the fuselage to move out of the way and the stresses are higher. Bigger bumps always cause...
Forum: RV-7/7A 08-15-2010, 11:31 AM
Replies: 97
Views: 33,959
Posted By Raiz
More or less, yes. That's what I mean when I say...

More or less, yes. That's what I mean when I say it's unvalidated. However, that's not to say its not useful, as modeling and experimentation normally go hand in hand when you are trying to solve a...
Forum: RV-7/7A 08-14-2010, 03:17 PM
Replies: 97
Views: 33,959
Posted By Raiz
Simulation of impact with a bump

On a couple of the previous posts, I promised a more detailed model of the nose gear. The graph below is an example of the output from that model, which attempts to predict the leg, tire and...
Forum: RV-7/7A 08-13-2010, 12:23 PM
Replies: 14
Views: 5,868
Posted By Raiz
Taken out of context, the thread on nose wheel...

Taken out of context, the thread on nose wheel collapse may seem alarming but the advice in the posts above is IMHO very sound. The VAST majority of landings on grass strips are just fine but there...
Forum: RV-7/7A 08-12-2010, 12:41 PM
Replies: 97
Views: 33,959
Posted By Raiz
Richard, thanks for avoiding the flames! I...

Richard, thanks for avoiding the flames! I re-ran the model with 200 ksi and it only increased the gear deflection to 4 1/4 ", so not enough to change my view about the limited travel. However, the...
Forum: RV-7/7A 08-12-2010, 12:25 PM
Replies: 97
Views: 33,959
Posted By Raiz
az_gila, thank you for this. I cross checked in...

az_gila, thank you for this. I cross checked in "Tool materials" by Joseph R. Davis, ASM International. Table 39 (6150 steel) gives a yield strength of 175 ksi (197 ksi ultimate). Here is the...
Forum: RV-7/7A 08-11-2010, 02:25 PM
Replies: 97
Views: 33,959
Posted By Raiz
Richard, that's really helpful information, thank...

Richard, that's really helpful information, thank you. The 168 ksi is for 6150 steel and came from matweb http://www.matweb.com/search/datasheet.aspx?MatGUID=6fbcc44fd0124994b46587a1aa905ef0
but,...
Forum: RV-7/7A 08-11-2010, 02:04 PM
Replies: 97
Views: 33,959
Posted By Raiz
Kent, you leave me with nowhere to go when you...

Kent, you leave me with nowhere to go when you talk about thinking being dangerous ! The answer to your question is terrye's point (post #11, I think) but I'll try and explain it in the most...
Forum: RV-7/7A 08-11-2010, 01:38 PM
Replies: 97
Views: 33,959
Posted By Raiz
That's a difficult one. The RV-7A has many great...

That's a difficult one. The RV-7A has many great qualities - performance, handling, simplicity, low cost and, with good technique and a good paved strip, an adequate nose gear. What I'm trying to...
Forum: RV-7/7A 08-11-2010, 10:07 AM
Replies: 97
Views: 33,959
Posted By Raiz
Danny7, the calculations on the leg are a...

Danny7, the calculations on the leg are a straight forward application of engineerís bending theory, which is widely accepted as being pretty accurate. However, in terms of a practical test, nobody...
Forum: RV-7/7A 08-11-2010, 10:06 AM
Replies: 97
Views: 33,959
Posted By Raiz
terrye, thank you for introducing some of the...

terrye, thank you for introducing some of the more advanced aspects of this. To your specific points:

Q1: The nose gear leg is at 43 degrees, so the nose gear bump load has two components, vertical...
Forum: RV-7/7A 08-10-2010, 12:19 PM
Replies: 97
Views: 33,959
Posted By Raiz
Hi GregM, You got me thinking, so I re-ran the...

Hi GregM,

You got me thinking, so I re-ran the analysis with a different AUW and static nose load (1600 lb and 250 lb respectively). This moves the CG back from 82.6" to 85.4". The graph in my...
Forum: RV-7/7A 08-10-2010, 11:47 AM
Replies: 97
Views: 33,959
Posted By Raiz
Danny 7, I think you are right with pilot...

Danny 7, I think you are right with pilot technique and back pressure but the problem is that there is always a speed below which a rearwards stick position has negligable effect and, if you hit a...
Forum: RV-7/7A 08-10-2010, 11:43 AM
Replies: 97
Views: 33,959
Posted By Raiz
The maximum tire deflection is just when it...

The maximum tire deflection is just when it bottoms on the rim. The leg deflection is determined by the yield stress in the leg, as per my other reply.

Keep the questions coming !

Raiz
Forum: RV-7/7A 08-10-2010, 11:40 AM
Replies: 97
Views: 33,959
Posted By Raiz
Q: Where the 1 3/4" leg deflection number came...

Q: Where the 1 3/4" leg deflection number came from?
A: It's the amount of vertical deflection (measured at the axle) required to reach the yield stress in the leg. I assumed a yield stress of 168...
Forum: RV-7/7A 08-10-2010, 10:58 AM
Replies: 97
Views: 33,959
Posted By Raiz
Post Suspension travel is the key to RV-7A nose gear collapse

I know the nose gear thing has been done to death already but here is a new angle on it, which just might save your nose gear. The key takeaway is: Donít brake on bumpy strips (if you can avoid it)....
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