RE: Will it fly?
years ago i built a bunch of pink foam 48" ws .40 combat wings, full span elevons no rudders just twin fins the egine was mounted in the wing prop flush with Leading edge center chord was 20" tips were 8" fully symetrical airfoil and a bit over 2" thick. the spar (1/4" door skin) lined up with the wing tip leading edge and it was the cg. they werent very fast but boy did they handle well and they would inverted flat spin (secret combat tactic ..play dead then attack) at the time they only cost $20 to build the airframe
Posted on: 12/11/2011 6:20 AM by Author "OLD_SLOW and in the WAY" in the forum "RC Combat"
http://www.rcuniverse.com/forum/fb.asp?m=10853990

RE: using camp fuel
with all due respects well you aint me..... and not all oils are made for high rpm engines try running an outboard, or sno machine oil and you will fry an engine. i have n[b]ever[/b] put much faith in synthetics for two strokes ... i have [b]never[/b] lost an engine due to siezing using [b]castor[/b], even back to the 1973 yahama sc500 single dirt bike they were dropping like flies due to piston siezures, i ran [b]castor[/b] based oils and never had a problem. but thats just me, not you huh
Posted on: 5/16/2010 8:49 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=9736873

RE: using camp fuel
In My Fatsrat engines i run maxima 927 castor at 5 ounces to the gallon of camp fuel, the castor oil will flow to hot spots unlike regular oils which will run away from hot spots. camp fuel will run so clean that its pretty hard to get a plug reading but its more forgivable with needle settings
Posted on: 5/15/2010 6:56 PM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=9735990

RE: Ryobi 30cc
ryobi's had rev limited coils at 9500 rpm if you can find an older homelite coil they weren't rev limited
Posted on: 4/14/2010 10:50 PM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=9661683

RE: swashdrive jet boat
you got a pm
Posted on: 12/1/2009 9:19 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=9294395

** Update pics 15% power gain with resonator
/img146/8491/f192mf8.jpg[/image] the easiest way to shape a custom flask is to buy a cheap candle just slightly larger than
Posted on: 10/24/2009 7:15 PM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=9195699

RE: ** Update pics 15% power gain with resonator
[color=#FF0000][b]this resonator is only tuned for can mufflers or straight pipes .... i had an idea one time to synchronize the resonator and see where it peaked then disable the flask and enable the tuned pipe so you could get a double punch of power[/b][/color] the stack is in the second photo that mushroom lookin aluminum thing or yoy can use the original black spit tube inside the flask. the numbers i gave out were for an engine timed at 180 exh 155 intake [b]here is the calculator i used. just plug in your numbers as far as volume goes and in the resonance tab is where you want the RPM band to work so plug in between 13,000 to 16,000[/b] http://www.lautsprechershop.de/tools/index_en.htm?/tools/t_helmholtz_en.htm [b]here is a good laymans graphics of its workings[/b] http://www.phys.unsw.edu.au/jw/Helmholtz.html [b] and another easier calculator[/b] http://www.vk2zay.net/calculators/helmholtz.php
Posted on: 10/23/2009 11:11 PM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=9197431

15% power gain with resonator
the units i tested have a 355ml volume ( as reference it the same volume as a 12oz pop can) with a 3/8" diameter intake horn by 1" long, the horn can be anywhere on the resonator. basically it uses the spitback to help charge the resonator box and the inertia of the incoming air through the smaller opening overcomes the spitback which supercharges the next intake cycle. the engine comes on like a nitrous shot. the shape of the resonator isnt critical as long as you have 1" between the carb opening and the resonator wall, you will have to have the intake runner lenght set at 3 13/16" from piston face to carb opening. the resonator will give you some insurance in a dunking by keeping from gettin hydro'd. nevermind the aluminum chips it was in the construction stage here are the only pice i have left of the "ratflask" hemmholz resonator. the container was made by rubbermaid and had a very tight seal with the lid. [URL=http://img11.imageshack.us/i/0999999.jpg/][IMG]http://img11.imageshack.us/img11/4282/0999999.th.jpg[/IMG][/URL] this is the velocity stack used inside the flask [URL=http://img260.imageshack.us/i/mutantengtyp017.jpg/][IMG]http://img260.imageshack.us/img260/3251/mutantengtyp017.th.jpg[/IMG][/URL] inlet horn and grommet [URL=http://img18.imageshack.us/i/obstuff126.jpg/][IMG]http://img18.imageshack.us/img18/6634/obstuff126.th.jpg[/IMG][/URL] interior of flask [URL=http://img260.imageshack.us/i/obstuff127.jpg/][IMG]http://img260.imageshack.us/img260/5186/obstuff127.th.jpg[/IMG][/URL] profile of intake stack, the 5 to 8% refernces the gain over a straight carb opening [URL=http://img260.imageshack.us/i/vstacks1.jpg/][IMG]http://img260.imageshack.us/img260/7006/vstacks1.th.jpg[/IMG][/URL] i am no longer in the biz so youz guyz are on your own if you want one
Posted on: 10/23/2009 9:32 AM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=9195678

RE: Big Block for 1/5 scale???
the rpm rating is for propped engines. the interior port layout is pretty much the same as a zen 260 or a sikk cylinder (4 port). they can be modded to spin some serious rpm, check out the heli guys. this engine is way over kill for a gas buggy kinda like puttin a hemi in a smart car
Posted on: 10/11/2009 8:16 AM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=9163324

twin terror
all i know about this engine is that a guy named Frank Giannini from new jersey builds these ... [image]http://img11.imageshack.us/img11/4608/i23038newpics1157a5245.jpg[/image]
Posted on: 10/9/2009 8:51 AM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=9158752

RE: I FOUND THIS IN THE TRASH!!!!!!!!!!!!!!!!!!
find a new dumpster... and return it... was thrown away for a reason
Posted on: 3/10/2009 7:59 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8562394

RE: looking for canadian engine builder ?
have the US builder send the engine with some loose parts (cooling ring off, starter, carb) and send it as warranty replacement parts this avoids the taxes
Posted on: 3/8/2009 12:30 PM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8555905

RE: Looking for Naca Ducts
here are some design parameters [image]http://img174.imageshack.us/img174/7137/nacaduct23f4e5uv1.jpg[/image]
Posted on: 2/27/2009 7:53 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8523761

RE: Gonna make my own crackerbox racers busts question..
its good to see some of my "girls are still around" Just an FYI...they were cast from two part foam in a silicon mold
Posted on: 12/31/2008 5:14 PM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8303167

RE: NEW ENGINE IDEA!
[quote]how do you know most are a bolt-up fit? have you tried it before? if you have, please post pics. [/quote] i know cuz ive done it a bunch of times .... when we used to do this it was way before there were digital cameras available.... most of the weedies have the same diameter flywheel and the bolt pattern for the coil was standard, chain saws dont have revlimited coils and some of them fit
Posted on: 12/19/2008 8:04 AM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8260863

RE: NEW ENGINE IDEA!
whipper snipper whacker hacker engines are rev limited at the coil to around 9500 rpm if you can find an old homelite coil they will spin up all the rpm you want and most are a bolt up fit
Posted on: 12/17/2008 11:33 PM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8257054

RE: Honda engines?
this is a stripped down Honda 35cc 4 stroke sitting next to the Marder frame... it appears that a new floor pan would have to be made to accomodate its slightly larger foot print.... but its do able
Posted on: 12/15/2008 6:35 PM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8249046

RE: Klotz benol castor oil
castor oil has a unique property it will run to a hot spot as regular oil will flow away from hot spots. i ran castor exclusively in my engines with gas and camp fuel. i had a reciever fail once and the engine sat there screaming in the bushes till we got to it with the chase boat and no water flowing through it. that darn thing was hot as heck but showed no signs of cylinder galling
Posted on: 12/3/2008 9:36 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8208200

RE: wanting to know
Get ahold of Zac at american rc...great guy, good prices tell him fastratfink sent ya http://www.americanrcboats.com/
Posted on: 11/13/2008 7:23 PM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8144666

RE: wanting to know
I am old ... dirt and me share birthdays hahah i get it, but the key word here is[b] conversion[/b]
Posted on: 11/13/2008 9:28 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8142981

RE: wanting to know
here is a shot of an air cooled conversion i used to build... take a look at the starter end mounts they are simply some aluminum angle with longer screws and some standoffs [image]http://img212.imageshack.us/img212/5229/s40201381kt3.jpg[/image]
Posted on: 11/13/2008 12:13 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8142309

RE: how to calculate the speed of a car?
layout 88 ft between a couple markers, have your buddy stand back and time the run with a stop watch. if you travel the 88 ft in one second, your doing 60 mph. or a shorter course is... 44 ft then its 1/2 sec per 60mph i tie wrapped my garmin Etrex to the cage [:D]
Posted on: 11/7/2008 12:28 PM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8123833

RE: gas mix
Hmmmmmmmmmm diesel? i got a homie to run on Ether and kerosene, a tad smoky though[:D]
Posted on: 11/7/2008 11:55 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8123769

RE: gas offshore class
keep it simple.... say anything 8 ft or less can race.... two strokes 35cc, 4 strokes 50cc or twin 20's when they come online. two classes that run together ... stock/piped ... and run what you brung maybe run small cards like they do in Europe white for stock class, black for Modded making it easy for ppl on the shore to id boats and close races. i think what your after is a gentlemans class, much like the Thunderboat's race under today a group of offshore boats runnin close, lookin scale. sounds like a neat idea[:D] for the starter boat you could rig up a smoke system from a plane easy enuff. when you see smoke..... you form up behind that boat NOW!!!
Posted on: 11/7/2008 11:52 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8123739

RE: engine problems!
what oil and ratio are you running? [b]do not use outboard oil [/b] you might have stuck the ring, if the bore isnt damaged just get a new piston/ring then have a buddy with a lathe take .002" off the diameter of the piston down to just above the wrist pin hole
Posted on: 11/2/2008 10:01 AM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8107296

RE: Winter time ..... What a great build to be had !
way to go Scott...... welcome to the darkside racin a round nose will make racing fun again
Posted on: 11/2/2008 9:43 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8107250

RE: 5b question high speed problems
2 gallons ....sounds like its air leak time check the carb isolator the metal inserts might have pushed through and is leaking air. cure is first off push the metal inserts back in the iso block, get some new screws with no washers, add a larger washer that picks up the plastic iso block, also make sure they arent too long and contact the cylinder
Posted on: 10/17/2008 8:15 PM by Author "OLD_SLOW and in the WAY" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8058827

RE: boost bottles
but a hemhols resonator is a different animal. running a can muffler they will give you the same power (15%boost) as a tuned pipe
Posted on: 10/11/2008 7:27 PM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8040000

RE: Engine Goes WOT with Radio On?
[quote][b]a cool swim to retrieve.[/b] [/quote] if you keep swimmin after your boat, a stuck throttle will be your [b]"last" [/b]problem dont get dead........ [:(] get a retrive boat or a good casting rod and reel
Posted on: 10/10/2008 9:16 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8035928

RE: Best/Cheapest
Warehouse hobby used to sell a water powered speedo. the pickup hung off the transom. we made a standard bracket for all our boats and could switch between the boats in minutes, it has a tell tale ressetable needle and was $30 or so. we used this in conjunction with the sendech tach for testing. we also had a Garmin Etrex gps but we felt the speedo and tach were more accurate
Posted on: 10/6/2008 8:54 AM by Author "OLD_SLOW and in the WAY" in the forum "Speed - RC Gas Boats"
http://www.rcuniverse.com/forum/fb.asp?m=8023183