robbieg

Hi guys have a os gt33 in a peakmodels Matt Hall MXS-R does any one have a throttle curve setup for this motor am using JRxg14 radio any suggestions would be much appreciated thanks .

Lifer

My Feedback: (1)

Do you have access to the radio's owners manual? I'm sure the info you need is there.

ahicks

My Feedback: (2)

No clue how many "steps" are in your curve, but 5 is common, and you might try something like 10-20-30-60-100 to start. There's been a ton written/debated on this, but I get how that might be hard to find. Holler if you need more help.

CK1

My Feedback: (60)

What is it about the present settings that you desire to be different ? Another persons radio settings will act totally different on your plane if the mechanical linkage isn't set up exactly the same for both.

ahicks

My Feedback: (2)

Yup, you're right. I was assuming the throttle linkage had been set up in a linear fashion, like you would a control surface. Should have mentioned that maybe.

robbieg

Would like the throttle to have a more linear feel on landing it is difficult to find the sweet spot so to speak ,have read that once the butterfly has gone beyond 60% there is little increase in power going to full stick does very little, I fly electric mostly maybe that is my problem thank you for your reply cheers

robbieg

Thank you ahicks will go through the linkage again and try your suggestion on the curve

robbieg

It seems to have to much throttle on not enough on landing maybe its the pilot have flown models for three decades this is my first foray into gas what I am looking for is a starting point thank for your reply

robbieg

Yes have a manual but like most manuals it does not explain much it assumes you are an expert thank you for your reply

drac1

My Feedback: (4)

It's trial and error to get the throttle response you want. With any engine, I start by setting the RPM with a tacho. 1/4 throttle = 1/4 top RPM, 1/2 throttle = 1/2 top RPM etc and then fine tune from there.

MTK

The first thing I've done with my GT33 is to change the throttle arm to one that is 1" long. This a simple length of 1/16" phenolic material that I make myself but any aftermarket aluminum will work great. Then I move the spring to the larger opening to reduce the amount of tension.

I use an "S" curve on throttle where the first 25% stick movement results in about 10% throttle butterfly opening. Then the next 25% stick movement results in about 15% throttle opening. The next 25% results in about 15-20% throttle opening and the last 25% results in the final 50-55%. Note the last 50% buys maybe 1K to 1.5 k rpm. I typically fly at 1/2 to 5/8ths stick movement and practically don't use full stick. Works pretty well like that. My full throttle revs are about 7.4K where half throttle is about 5.8-6K revs.

Walbros are notoriously non-linear. Wish OS would offer a carb similar to the one on their 15cc. Much more linear, barrel type. Then again I wish they would offer their GT33 in rear exhaust

kmeyers

+1 to this method, it is what I use.

OP are you asking about how to use the radio programming itself? If so in program mix do a throttle to throttle mix set each point with the stick in that position and the tach rpm that you want for all the points.

robbieg

Thanks MTK think I may have it sorted today at the field got a quick lesson on programming throttle curve thankyou for your input cheers Robbieg

robbieg

Thank you for you reply that is how I was thinking of over coming the problem use the tacho and set the curve thanks kmeyes