RCU Forums - Search Results
RCU Forums

Go Back  RCU Forums > Search Forums
Reload this Page >

Search Results

Register
FAQ
Community
Calendar
Today's Posts
Search
Vendor Directory
Notices
 
Page 1 of 2
1
2
Search: Posts Made By: sopwith
Showing results 1 to 25 of 47
Search took 0.48 seconds.
Forum: Gas Engines
11-11-2012, 06:49 AM
Replies: 63
Views: 6,081
Posted By sopwith

RE: Gas engine Ring

On a related subject, what kind of oil do you guys use with your expensive engine? I only have a collection of string trimmer and chain saw engines, and just use the cheap oil from WalMart. They also...
Forum: Gas Engines
11-11-2012, 06:36 AM
Replies: 63
Views: 6,081
Posted By sopwith

RE: Gas engine Ring

The compression test result for the factory rings is waht I got as well. The FB rings really do increase the power. I will have to order a few sets to try out. I bought some factory rings and they...
Forum: Gas Engines
11-10-2012, 01:43 PM
Replies: 63
Views: 6,081
Posted By sopwith

RE: Gas engine Ring

P.S What is the typical compression test reading on these small engines? I just modified a compression tester to work and tryed a few tests. The string trimmers, 25-31cc seem to all test out at 85-95...
Forum: Gas Engines
11-10-2012, 01:36 PM
Replies: 63
Views: 6,081
Posted By sopwith

RE: Gas engine Ring

I think the problem is likely the cheap, hard rings. In the old days of full scale radial cylinder engines, the rings were broken in on the bench by coating the cylinder with fine grit lapping...
Forum: Gas Engines
11-10-2012, 07:32 AM
Replies: 63
Views: 6,081
Posted By sopwith

RE: Gas engine Ring

I have been using old string trimmer and chain saw engines for my planes (store bought engines are too pricey for my budget), and have had problems installing new rings. The rings generally never...
Forum: Aerodynamics
11-06-2011, 05:10 PM
Replies: 73
Views: 15,265
Posted By sopwith

RE: What are boost tabs???

I flew my old Frankenflyer today with boost tabs on all control surfaces. It flew fine with no issues. The ailerons are driven by standard size servos and responded better at high speeds, I get a...
Forum: Aerodynamics
11-04-2011, 06:31 AM
Replies: 73
Views: 15,265
Posted By sopwith

RE: What are boost tabs???

The weather here in Colorado took a turn for the worse a couple of days ago turning my flying field (cow pasture) into a quagmire. I decided to use the time to install boost tabs on all the control...
Forum: Aerodynamics
10-30-2011, 04:58 PM
Replies: 73
Views: 15,265
Posted By sopwith

RE: What are boost tabs???

Yes, I have already installed it with slave links and have it adjusted. If the weather holds up I will try to fly it tomorrow. I only installed the tab on the elevator for now. If it all goes OK I...
Forum: Aerodynamics
10-30-2011, 06:13 AM
Replies: 73
Views: 15,265
Posted By sopwith

RE: What are boost tabs???

I have some large scale planes with Ryobi engines and thought I would try adding boost tabs to see how they work. I want to just add a tab on the back side of the control surface and see how that...
Forum: Aerodynamics
10-29-2011, 05:38 PM
Replies: 73
Views: 15,265
Posted By sopwith

RE: What are boost tabs???

Does anyone know the forces that are generated by the boost tab? It would be great to know how large a servo is required. I used a servo force program to try to get the numbers but it doesn't look...
Forum: Engine Conversions
02-17-2011, 08:54 PM
Replies: 7
Views: 1,140
Posted By sopwith

RE: carburetor problem revealed

I ended up just using the plastic cap from a can of spray paint. I cut it to fit the carburetor and put a piece of open cell foam in the large opening. This worked well, any fuel that happened to...
Forum: Engine Conversions
02-16-2011, 05:49 PM
Replies: 7
Views: 1,140
Posted By sopwith

carburetor problem revealed

I was trying different carburetors on a Ryobi 30cc and was having high speed problems. I ran the engine on a test stand with nothing on the carburetor input. I noticed fuel coming out of the...
Forum: Engine Conversions
02-10-2011, 08:56 PM
Replies: 16
Views: 10,817
Posted By sopwith

RE: Home made CDI question

You need a coil for a CDI ignition system (actually 2 coils). The easy way to make a toroid coil is to use a 2 part coil form with a plastic bobbin. These are commonly used by ham radio builders. The...
Forum: Engine Conversions
02-06-2011, 07:52 AM
Replies: 2
Views: 895
Posted By sopwith

Dynamic balancing of an engine?

Has anyone tried to do a dynamic balancing of an engine? I wonder how hard it is to do and what equipment is needed.

Thanks
Forum: Engine Conversions
02-04-2011, 08:27 PM
Replies: 1
Views: 883
Posted By sopwith

tuned straight pipe for Ryobi conversions

I have a number of Ryobi, Poulan, ect engines converted to RC airplane use. I have made some straight pipe exhaust systems that have added 500+ RPMs over the stock mufflers. I would like to add a...
Forum: 3D Electric Flying!
01-07-2009, 12:01 AM
Replies: 9
Views: 1,584
Posted By sopwith

RE: lithium polymer battery problems

I have looked at universal brushless ESC and they mostly have an automatic cutoff that cuts out at 70% of the initial voltage. That is about 7.77 volts for a 3 cell 11.1 volt battery. Is this goint...
Forum: 3D Electric Flying!
01-01-2009, 10:15 PM
Replies: 9
Views: 1,584
Posted By sopwith

RE: lithium polymer battery problems

I have looked into my problem a bit...what voltage should a 3 cell lipo ESC shut off the motor? Mine was still running the motor when the voltage dropped below 8 volts.

Thanks
Forum: 3D Electric Flying!
12-21-2008, 11:01 PM
Replies: 9
Views: 1,584
Posted By sopwith

lithium polymer battery problems

I only recently started using Lipo batteries and am seeing problems during flight. My airplane controls go dead mid flight and I crash. This is true for several planes. The motor and control...
Forum: RC Fuels
05-21-2008, 10:44 PM
Replies: 80
Views: 20,968
Posted By sopwith

RE: E85

Again off topic...how did you change the fuel ration for the E85, does someone have a conversion kit for carburetors and fuel injectors?
Forum: RC Fuels
04-28-2008, 08:09 AM
Replies: 80
Views: 20,968
Posted By sopwith

RE: E85

I have been doing more flying with E85 fuel, and have started having problems with the Thunderbolt 115480 glow plugs. Previously I posted that these are the only plugs that seem to make the engine...
Forum: RC Fuels
04-14-2008, 10:15 PM
Replies: 80
Views: 20,968
Posted By sopwith

RE: E85

Looks like Tommys Karts is the place to buy oil, cheaper than the manufacturer. It may be about the same after shipping though. It said $8.00 minimum or something to that effect. I assume that is per...
Forum: RC Fuels
04-14-2008, 12:10 PM
Replies: 80
Views: 20,968
Posted By sopwith

RE: E85

For those of you interested, I just bought a case (4 gallons) of Green Heavy 4 Stroke oil from Morgans Fuels. It cost $25.30 per gallon including shipping. That is cheaper than caster oil, and...
Forum: RC Fuels
04-09-2008, 10:05 PM
Replies: 80
Views: 20,968
Posted By sopwith

RE: E85

I have been starting to buy older engines on Ebay that are larger than recommended for my planes, .40 for the .25 planes, .61 for the .40 ect. to make up for the reduced power of my home made fuels....
Forum: RC Fuels
04-08-2008, 09:57 PM
Replies: 80
Views: 20,968
Posted By sopwith

RE: E85

P.S. from my last post ( I always forget something). There were some questions about power loss with E85. Some posts claim there is only a few hundred RPM drop in power when compaired to commercial...
Forum: RC Fuels
04-08-2008, 09:39 PM
Replies: 80
Views: 20,968
Posted By sopwith

RE: E85

There were some questions about my posts, so I will elaborate further. Before I tried E85, I was mixing my fuel with methanol with no nitro. I tried all kinds of mixures to see how they worked. I...
Showing results 1 to 25 of 47
 
Page 1 of 2
1
2


 
Forum Jump

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.