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Search: Posts Made By: lohring
Showing results 1 to 25 of 32
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Forum: Speed - RC Gas Boats
04-09-2013, 08:54 AM
Replies: 14
Views: 6,007
Posted By lohring

RE: Proper gas mixture

We used the water method to measure the amount of ethanol in gasoline. We used a 1000 cc graduated cylinder and didn't shake it much or wait an hour.  it worked very well.

Lohring Miller
Forum: Speed - RC Gas Boats
04-06-2013, 09:22 AM
Replies: 14
Views: 6,007
Posted By lohring

RE: Proper gas mixture

Stock engines will run fine with 4 oz. oil to a gallon.  However, more oil gives more power, at least up to 10 oz per gallon.  I have no idea how the quantity of oil affects engine life, but rod big...
Forum: Speed - RC Gas Boats
04-04-2013, 08:24 PM
Replies: 14
Views: 6,007
Posted By lohring

RE: Proper gas mixture

As far as power goes, Our dyno tests of a lot of different "gasolines" along with different oils at the same 8 oz. per gallon ratio found very little to no difference at the best needle setting. Less...
Forum: Speed - Electric
03-31-2013, 07:24 AM
Replies: 9
Views: 745
Posted By lohring

RE: bateries

Read the Safety Corner (http://www.namba.com/content/library/propwash/2013/March/) in the NAMBA Propwash to see what can happen when you defeat the balancing function to try to charge a damaged...
Forum: Speed - Electric
03-29-2013, 08:05 AM
Replies: 10
Views: 2,504
Posted By lohring

RE: Dave frank plans?

Here's a 1989 Dave Frank 1/8 scale hull repowered with an electric motor on the way to dominating the 2012 NAMBA Electric Nationals. It was driven by Brian Buaas to first in 1/8 scale and T sport...
Forum: Speed - Electric
03-04-2013, 09:43 AM
Replies: 3
Views: 541
Posted By lohring

RE: outboard and motor info ?????

Take a look at Hyperformance adapters and power systems (http://hyperprod.bizhosting.com/outboard_motor_accessories.html).  I'd run a better speed control, though.  We typically run a Turnigy Marine...
Forum: Speed - RC Gas Boats
02-27-2013, 08:20 AM
Replies: 7
Views: 873
Posted By lohring

RE: 60

Very interesting.  Are the supercavitating foils available?  How about the section dimensions and characteristics?

Lohring Miller
Forum: Glow Engines
02-23-2013, 06:27 AM
Replies: 40
Views: 8,058
Posted By lohring

RE: KB .18, any users?

The company that bought K&B, RJL, buys old engine companies and assembles the leftover parts into engines.  They are not in the business of seriously making anything, though they occasionally make or...
Forum: Gas Engines
02-19-2013, 09:14 AM
Replies: 33
Views: 4,702
Posted By lohring

RE: A little gasoline Info on those gas engines

I have also done a lot of fuel testing in a modified Zenoah marine engine.  See the article Gasoline (http://www.namba.com/content/library/propwash/2009/october.pdf) in the NAMBA Propwash.  Since it...
Forum: Gas Engines
02-18-2013, 08:29 AM
Replies: 12
Views: 1,423
Posted By lohring

RE: Great carburator on small 25cc engines ?

There's a big difference between even the stock purpose built marine engines and the average weedeater motor.  A stock 26 cc Zenoah with a custom tuned pipe puts out close to 4 1/2 hp.  I doubt that...
Forum: Gas Engines
02-17-2013, 09:11 AM
Replies: 12
Views: 1,423
Posted By lohring

RE: Great carburator on small 25cc engines ?

Don't waste your time playing with non marine engines.  The very low cost Rev Unlimited...
Forum: Speed - Electric
02-15-2013, 10:12 AM
Replies: 16
Views: 8,196
Posted By lohring

RE: 35K rpm max?

The right propeller rpm is a good question.  We have been trying to duplicate nitro engine performance with low cost electric systems so we match the nitro rpm.  However, what are the real...
Forum: Speed - Electric
02-15-2013, 09:53 AM
Replies: 18
Views: 1,406
Posted By lohring

RE: power of motor

Motor power has nothing to do with rpm.  Input power is easily calculated as amps times volts. You can decrease the voltage and increase the current for the same power.  Output power for brushless...
Forum: Speed - Electric
02-11-2013, 11:02 AM
Replies: 18
Views: 1,406
Posted By lohring

RE: power of motor

Prop diameter and pitch determine the power required at a given rpm regardless of anything else.  Motor rpm is determined by Kv and voltage.  Loading the motor more will only reduce the rpm a little...
Forum: Speed - RC Gas Boats
02-07-2013, 06:44 AM
Replies: 22
Views: 2,550
Posted By lohring

RE: What hull would you choose?

ML Boatworks has state of the art tunnel hulls (http://leagueathletics.com/Default.asp?snid=jNGE\7D3X&org=ml-boatworks.com) with very accurate laser cut parts.  They build outboard gas, electric, and...
Forum: Speed - RC Nitro Boats
02-04-2013, 09:07 AM
Replies: 19
Views: 5,139
Posted By lohring

RE: Thunder Tiger outboard anyone?

Modified Thunder Tiger engines did quite well in our area racing.  Only a few people specialized in their modifications, though.  The OS is very fast out of the box with the head shim removed.  One...
Forum: Speed - RC Nitro Boats
02-04-2013, 09:02 AM
Replies: 13
Views: 883
Posted By lohring

RE: Another K&B .40 O/B question

The rear PTO bearing doesn't get lubricated very well and water gets into it through the lower unit.  It's common practice to remove the power head after each day's running and be sure the bearing...
Forum: Speed - RC Gas Boats
01-30-2013, 09:40 AM
Replies: 17
Views: 1,977
Posted By lohring

RE: Can flipping hurt your engine?

The biggest problems with flipping come from trying to compress any water in the cylinder.  If the cylinder mount lugs aren't bent or cracked the rod can be bent.  The most common problem that isn't...
Forum: Speed - RC Gas Boats
01-27-2013, 09:10 AM
Replies: 10
Views: 1,164
Posted By lohring

RE: Good Newb Questions

These boats all run best on smooth water. This (http://www.youtube.com/watch?v=f_raLpj979w) is a good example of national level racing. There's no substitute for seeing the boats run and talking to...
Forum: Speed - RC Gas Boats
01-26-2013, 08:52 AM
Replies: 10
Views: 1,164
Posted By lohring

RE: Good Newb Questions

The national racing organizations in your area are NAMBA (http://www.namba.com/content/default.asp) and IMPBA (http://www.impba.net/). A close boat club is the Voodoo Model Boat Club...
Forum: Speed - Electric
01-10-2013, 08:22 AM
Replies: 3
Views: 607
Posted By lohring

RE: repower miss vegas with sv 27 setup?

Two of our club members have repowered the Vegas with UL-1 power.  That's a 2030 Kv motor.  They handle rough water better than the UL-1 at similar speeds.

Lohring Miller
Forum: Gas Engines
01-01-2013, 09:14 AM
Replies: 29
Views: 3,214
Posted By lohring

RE: down with ethanol

We run tuned pipes on all our marine racing engines.  BMEP is a standard measure of the state of tune of an engine.  It summarizes a lot of factors and higher values usually indicate the need for...
Forum: Gas Engines
12-31-2012, 10:00 AM
Replies: 29
Views: 3,214
Posted By lohring

RE: down with ethanol

The link to the article "Gasoline" in the NAMBA Propwash was contained in my post.

Lohring Miller
Forum: Gas Engines
12-30-2012, 09:31 AM
Replies: 29
Views: 3,214
Posted By lohring

RE: down with ethanol

"Try running Coleman fuel in a European engine and then come back here and make that statement again. (unless you're at an altitude of more than 6000', which brings down the effective compression end...
Forum: Speed - RC Gas Boats
12-29-2012, 10:26 AM
Replies: 9
Views: 1,121
Posted By lohring

RE: Water Pumps

Racers never run either clutches or water pumps.  It takes some forward motion at launch without a clutch, but not much.  If you never idle the boat, you don't need them.  With short periods of...
Showing results 1 to 25 of 32
 
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