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Search: Posts Made By: Larry DeCamp
Forum: RV Ongoing Maintenance Issues Yesterday, 08:04 AM
Replies: 8
Views: 453
Posted By Larry DeCamp
Flamemaster vs. PPG

Lots of endorsements here on numerous Polysulfides. Flamemaster and PPG are readily available with a big price difference. Is there any real world experience out there to comment on the difference ?
Forum: VAF Classifieds (posts in here deleted after 30 days) 08-01-2021, 01:55 PM
Replies: 3
Views: 280
Posted By Larry DeCamp
Skybolt lessons learned

Big fan of Skybolt on two projects .
FYI :
Some component geometries ( ie. curved components) require removal of the individual studs each time. Not a big deal, still easy peasy, just be aware.

The...
Forum: RV General Discussion/News 07-15-2021, 09:25 AM
Replies: 86
Views: 9,518
Posted By Larry DeCamp
A comment from yesterdays BFR

I had not flown a 172 for 5 years and my 1HR BFR was exhausting. The controls were so heavy and lagging in response that it was embarrassing. That said, I agree that learning in a "hot rod" (the CFI...
Forum: RV-3 07-15-2021, 09:13 AM
Replies: 13
Views: 958
Posted By Larry DeCamp
Surprising constraints for light 3B

I got my spreadsheet out for my 762 LB EW 3B.
My weight with wallet, shoes, cell phone, knee board etc. is about 190 LB.
An 1,100 lb gross weight only allows 25 gallon fuel.
However, IF I assume a...
Forum: RV-3 07-10-2021, 07:29 PM
Replies: 13
Views: 958
Posted By Larry DeCamp
Where is the weight ?

My EW is 762 w/paint, pants etc. if you assume full tanks and 180 pilot, you get one cg. If you assume 15 gallons and 30lb baggage, you get quite a different cg. Just like an accountant says, what do...
Forum: Electrical Systems 07-05-2021, 07:14 PM
Replies: 14
Views: 779
Posted By Larry DeCamp
Inside Diameter required ?

Wrap a tie wrap around the 44 bundle. Measure the nominal OD. Text me the number and I will make you a flanged Delrin bushing with OD that matches common drill sizes.
Forum: Painting your RV 06-26-2021, 03:25 PM
Replies: 7
Views: 463
Posted By Larry DeCamp
C’joy answer

Yes, the primer that failed for me was Eckoprime not eckopoxy.
Forum: Painting your RV 06-26-2021, 02:31 PM
Replies: 7
Views: 463
Posted By Larry DeCamp
Pulled rivets are a recipe for a bad experience!

And, waterborne paint is much more difficult to get good results than solvent.
Paint is cheaper than messing up your hard work and having a heavy airplane. My course of action would be to practice...
Forum: Propellers 06-25-2021, 05:12 PM
Replies: 9
Views: 841
Posted By Larry DeCamp
RPM sensitivity ?

I have been puzzled by this as sell. Max stAtic RPM is about 2000. I would need a hole in my cowl to do balance At cruise RPM. Not an attractive options, any suggestions ??
Forum: Fuel Injection Systems 06-25-2021, 05:22 AM
Replies: 12
Views: 1,311
Posted By Larry DeCamp
Ahhh, the manual switch 👍

Thanks Ross, the switch was the missing link in my concern for isolation. This puts EFI slightly ahead of mechanical injection ( in my judgement) because you cannot reasonably employ two servos.
Forum: Fuel Injection Systems 06-24-2021, 05:45 AM
Replies: 12
Views: 1,311
Posted By Larry DeCamp
EFII reliability discussion ?

Rocketman1988 recently commented “ if you drill down far enough, you will find single point failures”. Yes, carbs have floats and orfices. Mechanical injection has one servo. EFII has one circuit...
Forum: RV-3 06-23-2021, 05:09 PM
Replies: 3
Views: 548
Posted By Larry DeCamp
RV3B buyer question

If you were shopping for a 3B, would you prefer carb and EI VS. EFII for 5k more ?
Forum: Propellers 06-19-2021, 05:02 AM
Replies: 8
Views: 712
Posted By Larry DeCamp
Potential source of expertise

There was a website / forum for wooden propellers. Maybe your Cub, Luscombe, Champ etc buddies can be helpful. The Air Power Museum also knows a lot of smart people, call Brent.
Forum: Fiberglass 06-17-2021, 02:15 PM
Replies: 21
Views: 2,620
Posted By Larry DeCamp
Great comments from Dan

Question- I have experienced random episodes of faster than normal cure rate with reasonably small quantities. I concluded the common thread was mixing new ingredients in a container with “ work in...
Forum: RV-4 06-08-2021, 01:18 PM
Replies: 37
Views: 2,922
Posted By Larry DeCamp
CF plate

I just laminated roll stock under polyethylene with compression. Thickness is about .060" and weight is 1.5 gram per square inch ( fully saturated with resin ) ie shiny both sides.
Forum: RV-4 06-08-2021, 04:41 AM
Replies: 37
Views: 2,922
Posted By Larry DeCamp
PilotJohnS material priorities

I am one person that has done the 100% carbon fiber stiffener. A CF plate was used like David’s aluminum “ beam web” and then carbon was wrapped around the gear leg and the back of the carbon plate....
Forum: RV-4 06-07-2021, 04:43 AM
Replies: 37
Views: 2,922
Posted By Larry DeCamp
Question for David Paule

Maximizing section modulus is clearly a high yield design parameter. Material selection might be as well . So far there is little mention of the different performance potential of wood, glass,...
Forum: RV-4 06-06-2021, 06:24 PM
Replies: 1
Views: 322
Posted By Larry DeCamp
Prebuy

Try Rocket Bob
Forum: RV General Discussion/News 05-28-2021, 05:09 AM
Replies: 15
Views: 1,338
Posted By Larry DeCamp
Hand prop Pmag

At one point, Pmag claimed a 9 volt smoke alarm battery would start the engine. I have snap on connector in the harness for this purpose. I have not used this feature. So, has anyone tried it...
Forum: Traditional Aircraft Engines 05-26-2021, 05:46 AM
Replies: 7
Views: 719
Posted By Larry DeCamp
Leaning on the ground

Thanks Mike. I do what you suggest except I have not been using MMO. My engine builder suggested a rich mixture is indicated by the black plug body even though the insulators are clean.

Using 100%...
Forum: Traditional Aircraft Engines 05-25-2021, 04:40 PM
Replies: 7
Views: 719
Posted By Larry DeCamp
Is there a best fuel ???

Ok, below are some popular topics :
* 100 LL lubricates valve guides but also causes them stick. But, some report it is trouble free if you burn off the plugs at shutdown.
* Mogas burns clean and...
Forum: RV General Discussion/News 05-21-2021, 10:31 AM
Replies: 81
Views: 15,699
Posted By Larry DeCamp
Valve stem lubrication ?

I recently experienced a stuck exhaust valve on mogas. Above in this thread it was proposed that some lead does help lubrication. Yet, others share how they run TBO on mogas with no issues. Any...
Forum: Traditional Aircraft Engines 05-11-2021, 05:00 PM
Replies: 13
Views: 1,271
Posted By Larry DeCamp
Accurate top dead center question ?

Lining up the case split with 0 on the flywheel is OK, but why do folks debate advance numbers with such an arbitrary reference.

So my question is how to be precise about where is TDC. I fabricated...
Forum: Electronic Ignition Systems 05-08-2021, 10:06 AM
Replies: 39
Views: 3,769
Posted By Larry DeCamp
+1 for Vlittles comment.

My 3B is dual pmag with carb, simplicity & reliability.
My R4 is SDS ignition ( two batteries ) and AFP injection (two fuel pumps ) Again, simplicity and reliability.
Forum: Electronic Ignition Systems 05-06-2021, 12:33 PM
Replies: 19
Views: 1,905
Posted By Larry DeCamp
Final update for Pmag pilots

The bottom line, all my leads are in spec after 250 hours use. Here are lessons learned:
* The problem was my low budget multimeter . It lied and finally died, and the new $200 Fluke says all is well...
Forum: RV-8/8A 05-05-2021, 08:27 AM
Replies: 8
Views: 886
Posted By Larry DeCamp
Update

Well I did the math again using RV4 arms from Vans manual. In general terms, 150lb pax would be equivalent to 29 lb tail weight yet produce the same CG. But, ( my bad in prior post) the w x r^2...
Forum: RV-8/8A 05-05-2021, 05:09 AM
Replies: 8
Views: 886
Posted By Larry DeCamp
Center of mass = center of rotation ?

One more question. Is it correct that center of mass , the datum, is the location of the cg balance point in the calculation? If correct, I will post some calculations for reference that may be...
Forum: RV-8/8A 05-04-2021, 06:50 PM
Replies: 8
Views: 886
Posted By Larry DeCamp
Yes Bob

The formula referenced is Weight times the distance from the rotational center of mass squared. My ipad does not generate power of two symbols ��

So, can a small tail weight achieving the same...
Forum: RV-8/8A 05-04-2021, 04:39 PM
Replies: 8
Views: 886
Posted By Larry DeCamp
Testing cg options ?

Recently an RV8A question was raised regarding simulating w&B response with weight added to pax seat, baggage etc. I cannot recover that thread.

However, some time ago I suggested a weight on the...
Forum: Electronic Ignition Systems 05-03-2021, 04:43 PM
Replies: 3
Views: 486
Posted By Larry DeCamp
Thanks Bill

Your comment may also explain why four of my Pmag plug connector spring clips are "rusty", and those leads had NO CONTINUITY.

My new MSD plug connectors are really tight on the plug and the...
Forum: Electronic Ignition Systems 05-03-2021, 05:40 AM
Replies: 3
Views: 486
Posted By Larry DeCamp
Air gaps in plug/coil connections ?

It appears that legacy ignition coil wires, HEI coil terminals and spark plug connectors all seek/employ an inference fit between the high voltage wire terminal and the coil or plug.

The Pmag coil...
Forum: RV-14 04-30-2021, 09:15 AM
Replies: 25
Views: 3,468
Posted By Larry DeCamp
+1 for Carls point

B&C advised me the Alt powered from the master bus is fine and they do recommend a 5AMP breaker in the field power due to transients that do happen .
Forum: Electronic Ignition Systems 04-29-2021, 05:54 PM
Replies: 19
Views: 1,905
Posted By Larry DeCamp
ETCO fit to Pmag stud ?

Thanks to all for great participation. I took the Pmag distributor terminal to the hanger today and it was surprisingly loose on the Pmag coil stud . So, how important is a forced contact . The .171...
Forum: Electronic Ignition Systems 04-29-2021, 04:55 AM
Replies: 19
Views: 1,905
Posted By Larry DeCamp
MSD Coil socket terminals don't fit Pmag

Received my MSD set with two styles of boots and terminals, not usable. Facts for reference:
The perceived failure mode of the Pmag plug terminal was 180degree conductor bend or nicked conductor....
Forum: Electronic Ignition Systems 04-25-2021, 04:47 AM
Replies: 19
Views: 1,905
Posted By Larry DeCamp
Thanks LR172

Based on your input, regardless of the quality of the wire, when bending the core wire under the crimp fitting, a radius will be better than a 90degree pull down the face of insulation.

I am working...
Forum: Electronic Ignition Systems 04-24-2021, 09:52 AM
Replies: 19
Views: 1,905
Posted By Larry DeCamp
More information discovered

Reading ohms with VOM on metal connectors (both ends) gives no continuity. And, with the metal plug connector off, touching the black conductor has NO continuity. But. pushing the VOM probe between...
Forum: Electronic Ignition Systems 04-24-2021, 07:31 AM
Replies: 19
Views: 1,905
Posted By Larry DeCamp
Pmag plug wires bad

Recent thread discussed broken spring clips, 180ohm per foot and wiggle boots to diagnose. Well, I found 4 of 8 wires completely open circuit between coil and plug connectors ��
Details:
- All 4 bad...
Forum: Fuel Injection Systems 04-14-2021, 01:48 PM
Replies: 7
Views: 542
Posted By Larry DeCamp
Thanks to all, good info.

The fuel pump flow vs temperature analysis is relevant and reassuring.

The 4" spacing for bubbles sounds like the defining issue.

Potentially a LONG delay on the ground (high return rate /low...
Forum: Fuel Injection Systems 04-14-2021, 11:11 AM
Replies: 7
Views: 542
Posted By Larry DeCamp
Thanks much Ralph

I believe you. Bulkhead fitting in the access plate it will be.

BTW, I am only doing this as a courtesy for future owners. My 4 is AFP injection, but I feel the Bosch style will eventually prevail...
Forum: Fuel Injection Systems 04-14-2021, 10:08 AM
Replies: 7
Views: 542
Posted By Larry DeCamp
EFI fuel return question ?

The point has been expressed that returning the bypass fuel to tank will heat the fuel. How much is too much ? My dilemma is, if I dump the fuel in tank bay nearest the pickup ( simple bulkhead...
Forum: Electronic Ignition Systems 04-07-2021, 06:14 PM
Replies: 9
Views: 955
Posted By Larry DeCamp
Less is more

Consider:
There are two things to test.
1-Does the Pmag start with 12v input ? This is the normal run up test.
2- Does the internal generator work ? Just turn off the master when you shutting down...
Forum: RV Building Tips/Techniques 04-05-2021, 05:28 PM
Replies: 10
Views: 3,652
Posted By Larry DeCamp
Orientation

FWIW, my conversation with EI regarding orientation of the wire should be up. My FI RV4 layout was begging for a vertical input to output orientation. They said that is OK, the life of jeweled...
Forum: RV Ongoing Maintenance Issues 04-02-2021, 05:44 AM
Replies: 13
Views: 1,289
Posted By Larry DeCamp
Conflicting possibilities

Thx to all for the input.

Mike: maybe the mogas users with high hours can share valve stick experience. Maybe I am in a minority experiencing lack of lubrication from no lead.

Carl & Rocket Bob :...
Forum: RV Ongoing Maintenance Issues 03-31-2021, 03:16 PM
Replies: 13
Views: 1,289
Posted By Larry DeCamp
Sticky valve question for gurus ?

Today I reamed a sticking valve on Mellinium cylinder with 250 HRs. There was only carbon in the reamer and the valve stem had some bronze scuffing. The valve and cylinder look perfect with a...
Forum: RV Building Tips/Techniques 03-28-2021, 10:19 AM
Replies: 4
Views: 404
Posted By Larry DeCamp
Proseal easy removal for fuel sendor ?

Installing CIES senders.
I have read and personally know how proseal ONLY is challenging to deal with to remove if needed. Some swear by cork with proseal, others swear AT the rubber provided by...
Forum: Glass Cockpit 03-28-2021, 10:03 AM
Replies: 11
Views: 1,365
Posted By Larry DeCamp
Ed answer

Per Stien’s video, I push the tool in and pull on the wire. It works on red and white and not once on green/white. Ended up cutting wires and order new db27 connector for GEA 24 😒
Forum: Glass Cockpit 03-28-2021, 05:58 AM
Replies: 11
Views: 1,365
Posted By Larry DeCamp
Green/White question for Kieth

I bought the green/white tool from Steinair for hight density pins. They said they were marginal. At my skill level they are useless. Is there a high density tool that works ?
Forum: RV General Discussion/News 03-26-2021, 04:50 AM
Replies: 8
Views: 644
Posted By Larry DeCamp
Gustbuster geomety

David,
The sexy gas springs I have seen tend to push on the canopy at a location creating relatively high structural stress (canopy closed) compared to cable or string fastened to the left side of...
Forum: Traditional Aircraft Engines 03-18-2021, 05:38 PM
Replies: 5
Views: 744
Posted By Larry DeCamp
Thanks moosepileit

I assume the carbide brush is meant to remove deposits ? I am advised that sometimes the guide and stem simply gall each other fabricated to proper tolerance. If this is the case, I may need some...
Forum: Traditional Aircraft Engines 03-18-2021, 04:39 PM
Replies: 5
Views: 744
Posted By Larry DeCamp
Lycoming exhaust valve reamer size ?

I need to ream a sticky exhaust valve on my 0320 w/Superior cylinders. Lycoming / Superior suggests to ream .4995 and mcfarlane sys .5005. Any experince to share on this ?
Forum: Traditional Aircraft Engines 03-17-2021, 04:58 AM
Replies: 22
Views: 3,312
Posted By Larry DeCamp
Oil change question ?

I agree with the 91 mogas endorsement. I also use XC 20-50 and camguard. My question is 4 month oil change frequency. Is there any data to encourage that . I fly weekly to assure good oil temp,...
Forum: RV General Discussion/News 03-16-2021, 05:11 AM
Replies: 10
Views: 942
Posted By Larry DeCamp
Stickon weight caveat

IF you put the adhesive weights on the ID of the flywheel so centrifugal force is not an adversary, AND the ignition uses a crank sensor, there could be a conflict.
Forum: RV-12/RV-12iS 03-12-2021, 06:49 PM
Replies: 18
Views: 2,174
Posted By Larry DeCamp
Tiny gray specks

As mentioned above, after 240 Hrs on my RV3, I see minuscule gray particles in the sump test cup. Coincidently, the sump valve seems more prone to drip briefly after closing. Time for new orings and...
Forum: Electrical Systems 03-11-2021, 06:34 PM
Replies: 2
Views: 595
Posted By Larry DeCamp
Deutsch pin crimp question ?

The mfg linked video for assembly instruction. It said use 1/4” bare wire in the contact pin. My stamped pins are 18-22 AWG. My concern is the 22wire is loose without crimp. I dont have a Deutch...
Forum: RV Building Tips/Techniques 03-01-2021, 12:47 PM
Replies: 5
Views: 815
Posted By Larry DeCamp
SV1 is a good part

installed two in my RV4 cheek cowls. They are solid, stable and glued to glass cheek cows with epoxy.
Forum: Reviews 02-22-2021, 04:23 AM
Replies: 21
Views: 4,132
Posted By Larry DeCamp
Auto transition from ROP to LOP ?

Please educate me regarding the risks and benefits. I have one of those SWITCHES to accomplish the task.
Forum: RV-3 02-19-2021, 07:27 PM
Replies: 5
Views: 788
Posted By Larry DeCamp
Leaks are a priority

As Paul says, the standard muff/ firewall valve puts heat in. My biggest source of cold air was the rear canopy to fuse seal and flap pushrod holes. Foam does a pretty good job on flap rod leaks. I...
Forum: Traditional Aircraft Engines 02-19-2021, 04:28 AM
Replies: 12
Views: 1,797
Posted By Larry DeCamp
Crankcase oil separator affect ?

There has been no mention of the affect of oil separators on this issue. When I installed the antisplat separator, oil usage dramatically reduced to negligible. But I always maintain 5-6 qt anyway....
Forum: GPS 02-17-2021, 10:22 AM
Replies: 3
Views: 525
Posted By Larry DeCamp
Metallic paint affect on GPS reception ???

Both my antenna are under the cowl. There is no doubt conductive stuff will degrade the signal reception. Any pireps on metallic paint over your GPS antenna ?
Forum: GPS 02-15-2021, 10:34 AM
Replies: 1
Views: 422
Posted By Larry DeCamp
GPS antenna spacing ?

There is significant comment that GPS antennas work well under the cowl. I recall mixed comment about spacing two, for example 26C and 35A in close proximity. Does anyone have a specific spacing...
Forum: GPS 02-12-2021, 04:49 AM
Replies: 81
Views: 8,266
Posted By Larry DeCamp
Bjdecker question re: metallic solids ?

I have often wondered when guys confirm acceptable component life and performance under the cowl, does that include metallic paint ?
Forum: GPS 02-09-2021, 03:00 PM
Replies: 8
Views: 741
Posted By Larry DeCamp
Thanks for the response.

Ironflights experience concerns me. What to do :rolleyes:
Forum: GPS 02-09-2021, 01:55 PM
Replies: 8
Views: 741
Posted By Larry DeCamp
GPS antenna question ?

Instructions for GA35 antenna to GPS20A specifies minimum 6.5 ft of cable. So I have a 7' RG400 . Instructions say you can coil the cable to fit the space allowed. Is there any problem anticipated...
Forum: Autopilots 02-09-2021, 06:46 AM
Replies: 13
Views: 2,363
Posted By Larry DeCamp
Garmin G3x / GSA 28 servo question?

I am installing the ID strap jumpers in the servo Dsub connectors. Garmin says pin 8 is a ground and can be used for both jumpers in the PITCH servo. Just double checking, is this correct ?

Also, I...
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