RE: DERIVATIVE, New 2X2
[quote]ORIGINAL: MTK Carbon veil application ensures a very stiff end product. Standard doping technique is used to cover the inside of the balsa skins. I use nitrate dope thinned 80%. I brush one coat on the bare balsa and let that dry for an hour or more. Then with the same dope I cover the inside surface with carbon veil. That's allowed to fully dry for a few hours before coming back with a second dope coat The amount of dope left in the skin is about 1-2 grams, just enough to fix the carbon to the skin and moderately seal the balsa. Total weight gain from the veil and dope is about 7.5-8 grams. Skin sealing is highly recommended..... less epoxy is used to install. This is a very light yet durable method to build foam wings. My wings last 1000's of flights [/quote] Matt, I'm curious about something.... when you line the inside of the skins with veil, it has a textured surface. How do you handle spreading the epoxy (used to glue skins to foam core) in a manner that is lightweight? I would imagine all of the nooks and crannys in the veil would hold more epoxy than normally sealed smooth balsa, where it's spread around in a thin layer with a trowel...
Posted on: 5/18/2012 5:21 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=11085509

RE: DERIVATIVE, New 2X2
[quote]ORIGINAL: MTK [quote]ORIGINAL: MarkGrabowski Uh, I'm having a brain freeze.... what is this 'fanfold' material you are using? [/quote] Foam, blue or pink; Home Depot.... I have the stab set in the fuse. I will post a few snaps tonight. My fixture is a simple piece of 1/16'' lexan. I will explain more with the photos. BTW - I always set the stab first to make
Posted on: 3/13/2012 10:23 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10998545

RE: DERIVATIVE, New 2X2
[quote]ORIGINAL: MTK [quote]ORIGINAL: cmoulder A photo of it [i]in situ[/i] would be nice. I can't quite picture it. From my very little experience with the ES pipe, it seems to me that the pipe tunnel separator/insulator doesn't require a very robust material as long as the airflow through the tunnel is adequate. [/quote] I'll take a couple snaps tonight and post. I think the foam will work out well for noise too. It's similar to 2mm depron without the paper, but sealed with the glass on the pipe side. Turns out this stuff is very resilient When completing my Aesthesis fuse, the pipe floor that was used (glassed balsa) weighed 3-4X as much (about 75 grams) as the glassed foam does (20 grams) [/quote] Uh, I'm having a brain freeze.... what is this 'fanfold' material you are using?
Posted on: 3/12/2012 8:48 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10997916

RE: Practicing F3A on AFPD
I'd like to see them develop this game for use on the new 3-d televisions now on the market.... IMHO, as much as I enjoy flying the sim, for me the challenge has been dealing with the lack of depth of field when flying pattern. for 3d or heli flying, they are sweet!
Posted on: 3/9/2012 8:22 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10993096

RE: Source for some Nomex honeycomb
Yep, you guys are right, I didn't dig deep enough.... Matt, what thickness and cell diameter do you recommend? (for servo trays, battery trays, etc)
Posted on: 3/9/2012 10:44 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10993085

RE: Source for some Nomex honeycomb
Thanks fellas... I took a look at it appears they are using 8oz glass on both side of these panels... I was actually looking for the nomex itself for a custom layup that's hopefully a bit lighter.... maybe I'm chasing windmills here?
Posted on: 3/8/2012 2:56 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10991932

Source for some Nomex honeycomb
I just hung up with CST...they don't sell honeycomb anymore. Who else supplies it in small quantities?
Posted on: 3/8/2012 1:11 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10991762

RE: OS 1.60 for a 2x2
FWIW, I've an OS 160 that's available.... has a Boca SS rear bearing, the Perry pump and nipple installed on the backplate. Been bench run only 15 minutes max for break in purposes. It's probably not going to be used by myself as I've had to downsize my planes to 110 size max so if someone needs it, gimme a shout and we can work out a fair deal for both of us... Mark
Posted on: 3/3/2012 8:21 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10984887

RE: Building a built-up pattern stab and wing
[quote]ORIGINAL: lgibjones Thanks for posting this build. I am getting ready to build a Starcraft Addiction 110, and the details about how to sheet the wing are very helpful. Thanks! [/quote] You don't see a 110 sized Addiction every day of the week, please consider doing a build thread with plenty of photos!
Posted on: 2/17/2012 3:00 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10963634

RE: Extreme Flight Vanquish 2m Build Thread
....
Posted on: 6/7/2011 6:47 AM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10561140

RE: Recommended Firewall for Electric Outrunners
[quote]ORIGINAL: matt13 The firewall I mounted my AXI 5330 off on my Wind S Pro was made from 3mm plywood, which I laminated with two layers of carbon fibre on one side, and one layer on the other. Another modeller made the suggestion when I could not get my hands on some end grain balsa, it came out quite stiiff and not too heavy. The blind nuts were mounted on seperate dounuts rather than directly into the fire wall, I used carbon firbre tow in attaching it to the fueslarge for the fillet. 100 plus flights, and so far so good![;)] [/quote] Matt, with the cooling holes you currently have on the firewall, have you ever run into an over-temp situation with your motor?
Posted on: 6/7/2011 6:38 AM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10561127

RE: ARGENTINEAN NEW MODEL
[quote]ORIGINAL: bjr_93tz [&o] I was really expecting something different when I read the title ''ARGENTINEAN NEW MODEL'' Nice looking plane, I'll just have to google ''Argentinean models'' now..... Best of luck for the team.. Brett [/quote] You should see the stuff I found when I was trying to google the website for "CA models"
Posted on: 6/4/2011 5:51 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10556971

RE: Recommended Firewall for Electric Outrunners
I'll try to get a photo of my attempt at a firewall for my build... It's a sandwich of carbon fiber and 3/16" end grain. I drilled several 3/4" holes in the thing to allow for cooling air from the nose over the motor and into the battery area, eventually out the bottom of the plane aft of where the TE of the wing is. I hope the holes don't weaken it too much [:o] great question, btw!
Posted on: 6/3/2011 7:20 AM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10554732

RE: Receiver packs
[quote]ORIGINAL: OhD Thanks guys, I ordered a couple of TP 1350s. They aren't much heavier than the 700s I've been using. Jim [/quote] Jim, I have one of the Jaccio voltage regulators that I used with 5 cell nimh packs.... is this regulator robust enough to run 2s lipo voltage through it (for a typical pattern servo setup)? Thanks, Mark
Posted on: 5/20/2011 12:31 PM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10531420

RE: Well, It Had To Happen-
The Futaba motor looks VERY similar to the Hacker A-50 sitting on my bench, purple anodizing aside.
Posted on: 5/13/2011 9:00 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10517586

RE: yoshioka kit?
. Xigris canopy and chin cowl. [/quote] include a fuse and now we're talkin'!!!
Posted on: 5/11/2011 3:50 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10514362

RE: Best pattern aircraft airfoils???
[quote]ORIGINAL: TonyF I just traced around a size 12 shoe. [/quote] So it's called a "Fraka 000-12" ?
Posted on: 5/11/2011 3:46 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10514356

RE: CA Model XURAMA BIPLANE Build Glow Powered
[quote]ORIGINAL: tuny More... After balancing the airplane I have the locations for the rx battery and the CDI Battery, and after weigth I'm sure that both can be used. the total weigth RTF is 4760. pics... [/quote] 4760 grams for a biplane? Incredible! All of the weight-saving steps you did during the build have paid off. I wanted to also ask, what is the brand of on-off power switch you have there?
Posted on: 5/5/2011 3:20 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10502431

Source for Rhino and Zippy 4s lipos
I need to get my behind in gear and get some lipos ordered... I'm going 4s x 2 and need capacity in the 4500-5000 range. Where can I order from without getting jerked around and not need to worry about poor vendor support?
Posted on: 4/21/2011 4:40 AM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10476073

RE: DERIVATIVE, New 2X2
Matt, don't throw you back out lifting that thing!
Posted on: 4/18/2011 7:36 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10469572

RE: Hindsight Build
[quote]ORIGINAL: randy10926 It looks like I will have lots of time to work on the Hindsight if the gov shutdown happens. Looking at the plans and parts kit it is going to be like building an Insight. The only differences are that the wood kit should be a lot easier to put together and the foam parts are a different shape. Keeping the fuse straight should be a lot easier. The rounded foam parts will probably be a little harder to skin. Now getting the foam parts will be interesting. I was going to try cutting them myself. I have not been able to find a good source of foam yet. The local hardware stores do not have large enough blocks. Any suggestions. [/quote] www.foambymail.com They have 1 pound density virgin foam for sale.... shipping charges are very reasonable too.
Posted on: 4/8/2011 1:51 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10451505

RE: Rx battery
[quote]ORIGINAL: jgg215 After losing two planes due to unexplained power failures(all components still functional at the crash site) I switched to using a dual Tech-Aero dual lipo system, similar to Arch. The weight of the dual power system using 350mah 2s lipos is only 100 grams and that includes two switchs. for an electric power system you can drop the second battery and connect to two cells of the main battery through the balance connector as the primary source. If you choose the regulator voltages appropriately, you will not have to charge the backup receiver battery, just check it every few flights. The dual switches allow you to confirm that each power path is functional prior to each flight. This  power setup is only 72 grams with full redundancy. I also had Ed put in JST connectors for the regulator battery connection. This eliminates any wire splicing(failure point) and will prevent you from ever plugging in a lipo directly to the receiver(Murphy issue). John [/quote] John, what about if my ESC has a BEC built in... can I plug one side of the rx battery setup into there vs. going through the balancing port? Actually, now that I think about it, your method does have one less failure point... always the risk of the esc getting zapped and losing bec capability... What brand 2S 350 lipo's you guys happy with?
Posted on: 3/31/2011 6:25 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10435484

RE: Pentathlon Evo - Electric
[quote]ORIGINAL: mtcarey I need help with this rudder Ive tried 4 times to make it stright. Anyone give me some detailed building info and pictures? [/quote] If I may suggest, take a look at the "Viper build" thread on this forum... Jeff has photos showing how he built his rudder, which at first glance, seems similar in construction...
Posted on: 3/26/2011 7:03 AM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10423643

RE: Lightning Build
I thought you were going with a glass canopy on this build?
Posted on: 3/26/2011 7:00 AM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10423639

Battery Balancer suggestions
Will be charging with my "old school" Hyperion charger for now... It only goes to 7S so I will be charging my packs 4S at a time... Need to get a reasonably priced balancer... suggestions welcomed. Does it matter that much if it's a balancer that you charge through the unit vs. something that discharges the cells with higher voltage (like an Astro blinky)?
Posted on: 3/17/2011 6:56 AM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10405616

battery suggestions: 8S with A50-16L
Need some suggestions for 4s x 2 packs to power my 110 sized setup...Hacker A50-16L, 18-10 prop to start...the plane has a fatter fuse than say a Wind 110, if that matters. It's almost always windy where I fly as well.... I noticed that the 25C and 30C packs weigh an extra ounce or more per pack... are they needed or can I get by with 15C or 20C? How many mAh capacity as well?
Posted on: 3/16/2011 9:30 PM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10405162

RE: My Neu 1512/3.5D - any thoughts/advice?
So, you're trying to discover something new about your neu?
Posted on: 3/15/2011 11:21 AM by Author "MarkGrabowski" in the forum "Electric Pattern Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=10401671

Homemade wing tube sleeve question
OK, I need to make some sleeves for my wing and stab tubes... I know the technique but can't remember how many wraps of what weight cloth? I'm going E on this build so light weight is important... I have 3/4 oz, 1.4 oz, and 3 oz on hand...
Posted on: 3/14/2011 7:35 PM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10400418

RE: cutting wing tube hole in foam cores
I would have thought the Forstner bit's teeth were too coarse and would "tear" the hole more that drill it cleanly... Does it cut clean?
Posted on: 3/14/2011 6:00 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10398668

RE: cutting wing tube hole in foam cores
I should have been a bit more clear... I have a carbon fiber wing tube so sharpening the end and using it as the cutting tool isn't an option...
Posted on: 3/14/2011 5:58 AM by Author "MarkGrabowski" in the forum "RC Pattern Flying"
http://www.rcuniverse.com/forum/fb.asp?m=10398665